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A discovery of two slow pulsars with FAST: “Ronin” from the globular cluster M15 Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-18 Dengke Zhou, Pei Wang, Di Li, Jianhua Fang, Chenchen Miao, Paulo C. C. Freire, Lei Zhang, Dandan Zhang, Huaxi Chen, Yi Feng, Yifan Xiao, Jintao Xie, Xu Zhang, Chenwu Jin, Han Wang, Yinan Ke, Xuerong Guo, Rushuang Zhao, Chenhui Niu, Weiwei Zhu, Mengyao Xue, Yabiao Wang, Jiafu Wu, Zhenye Gan, Zhongyi Sun, Chengjie Wang, Jie Zhang, Junshuo Zhang, Jinhuang Cao, Wanjin Lu
Globular clusters harbor numerous millisecond pulsars, but long-period pulsars (P ≳ 100 ms) are rarely found. In this study, we employed a fast folding algorithm to analyze observational data from multiple globular clusters obtained by the Five-hundred-meter Aperture Spherical radio Telescope (FAST), aiming to detect the existence of long-period pulsars. We estimated the impact of the median filtering
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Driving factors behind multiple populations Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-12 Ruoyun Huang, Baitian Tang, Chengyuan Li, Doug Geisler, Mario Mateo, Ying-Yi Song, Holger Baumgardt, Julio A. Carballo-Bello, Yue Wang, Jundan Nie, Bruno Dias, José G. Fernández-Trincado
Star clusters were historically considered simple stellar populations, with all stars sharing the same age and initial chemical composition. However, the presence of chemical anomalies in globular clusters (GCs), called multiple stellar populations (MPs), has challenged star formation theories in dense environments. Literature studies show that mass, metallicity, and age are likely controlling parameters
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Primordial black hole mass functions as a probe of cosmic origin Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-12 Yi-Fu Cai, Chengfeng Tang, Geyu Mo, Sheng-Feng Yan, Chao Chen, Xiao-Han Ma, Bo Wang, Wentao Luo, Damien A. Easson, Antonino Marcianò
We discuss a novel window to probe the origin of our universe via the mass functions of primordial black holes (PBHs). The mass functions of PBHs are simply estimated using the conventional Press-Schechter formalism for two paradigms of cosmic origin, including inflationary ΛCDM and bounce cosmology. The standard inflationary ΛCDM model cannot generate an appreciable number of massive PBHs; however
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HiFAST: An Hi data calibration and imaging pipeline for FAST Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-12 Yingjie Jing, Jie Wang, Chen Xu, Ziming Liu, Qingze Chen, Tiantian Liang, Jinlong Xu, Yixian Cao, Jing Wang, Huijie Hu, Chuan-Peng Zhang, Qi Guo, Liang Gao, Mei Ai, Hengqian Gan, Xuyang Gao, Jinlin Han, Ligang Hou, Zhipeng Hou, Peng Jiang, Xu Kong, Fujia Li, Zerui Liu, Li Shao, Hengxing Pan, Jun Pan, Lei Qian, Jinghai Sun, Ningyu Tang, Qingliang Yang, Bo Zhang, Zhiyu Zhang, Ming Zhu
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) has the largest aperture and a 19-beam L-band receiver, making it powerful for investigating the neutral hydrogen atomic gas (Hi) in the universe. We present HiFAST (https://hifast.readthedocs.io), a dedicated, modular, and self-contained calibration and imaging pipeline for processing the Hi data of FAST. The pipeline consists of frequency-dependent
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Tailored energy absorption for a novel auxetic honeycomb structure under large deformation Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-12 Xiuhui Hou, Bin Wang, Zichen Deng
In comparison to conventional hexagonal honeycomb structures, auxetic metamaterials with re-entrant configurations have exhibited superior mechanical properties in terms of energy absorption. To further enhance the energy absorption capacity of these materials, a novel re-entrant honeycomb configuration, named novel auxetic re-entrant honeycomb (NARH), is developed by incorporating “<>”-shaped cell
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Topological and superconducting properties of monolayered CoN and CoP: A first-principles comparative study Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-11 Jiaqing Gao, Zhenyu Zhang, Ping Cui
Two-dimensional systems that simultaneously harbor superconductivity and nontrivial band topology may serve as appealing platforms for realizing topological superconductivity with promising applications in fault-tolerant quantum computing. Here, based on first-principles calculations, we show that monolayered CoN and CoP with the isovalent FeSe-like structure are stable in freestanding form, even though
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Topological non-reciprocal robust waveguide transport Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-11 Ruizhi Dong, Yihuan Zhu, Dongxing Mao, Xu Wang, Yong Li
Devices that surpass the restriction of reciprocity of classical physical waves have brought intriguing possibilities for wave modulation. Non-reciprocal acoustic devices that rely on the viscosity of the medium or nonlinear effect have low efficiency and distortion problems respectively, and poor immunity to defects. The appearance of acoustic topological insulators achieves non-reciprocal transport
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Electronic structures and Mott state of epitaxial TaS2 monolayers Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-11 Qichao Tian, Chi Ding, Xiaodong Qiu, Qinghao Meng, Kaili Wang, Fan Yu, Yuyang Mu, Can Wang, Jian Sun, Yi Zhang
Layered material TaS2 hosts multiple structural phases and exotic correlated quantum states, including charge density wave (CDW), superconductivity, quantum spin liquid, and Mott insulating state. Here, we synthesized TaS2 monolayers in H and T phases using the molecular beam epitaxial (MBE) method and studied their electronic structures via angle-resolved photo-emission spectroscopy (ARPES). We found
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Elastic three-dimensional phononic topological insulators with Dirac hierarchy Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-11 Shao-Yong Huo, Qiu-Shuang Yang, Jiu-Jiu Chen, Hong-Kang Li, Long-Chao Yao, Fu-Chun He, Chun-Ming Fu
Three-dimensional (3D) phononic topological insulators (TIs) featuring two-dimensional (2D) surface states and one-dimensional (1D) hinge states have opened up a new route for multi-dimensional robust wave transport, providing unprecedented methods for integrated acoustic sensors and energy harvesting devices. However, aiming at the elastic 3D phononic TI with gapless surface states and hinge states
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Correlating dynamic relaxation and viscoelasticity in metallic glasses Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-11 GuangHui Xing, Qi Hao, Fan Zhu, Yun-Jiang Wang, Yong Yang, Hidemi Kato, Eloi Pineda, Si Lan, JiChao Qiao
Relaxation dynamics, essential for the structural evolution of non-equilibrium systems like glassy materials, remain enigmatic. Here, we explore relaxation dynamics and viscoelastic properties in three types of metallic glasses with distinct β relaxation behavior. In systems with significant β relaxation, stress relaxation and creep experiments reveal a transition from two-step to one-step relaxation
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Crystalline-amorphization-recrystallization structural transition and emergent superconductivity in van der Waals semiconductor SiP under compression Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-10 Chunhua Chen, Zhenyu Ding, Yonghui Zhou, Yifang Yuan, Nixian Qian, Jing Wang, Shuyang Wang, Ying Zhou, Chao An, Min Zhang, Xuliang Chen, Xiaoping Yang, Mingliang Tian, Zhaorong Yang
van der Waals (vdW) semiconductors have gained significant attention due to their unique physical properties and promising applications, which are embedded within distinct crystallographic symmetries. Here, we report a pressure-induced crystalline-amorphization-recrystallization transition under compression in binary vdW semiconductor SiP. Upon compression to 52 GPa, bulk SiP undergoes a consecutive
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Efficient second and third harmonic generation in dual-layer lithium niobate microdisk resonator Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-09 Zhenzhong Hao, Xiao Wu, Qiang Luo, Zhang Li, Rui Ma, Fang Bo, Feng Gao, Guoquan Zhang, Jingjun Xu
Lithium niobate thin film frequency doubler has extensive applications in the preparation of classical and quantum sources. In this study, we successfully fabricated microdisk resonators with a quality factor of 2.2×105 in reverse-polarization dual-layer x-cut lithium niobate for the first time. Based on the modal phase matching condition, efficient second harmonic generation with a record normalized
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Topological pseudospin switcher: Mechanism and acoustic realization Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-04-07 Jia-He Chen, Yiyin Chen, Yaoqieyu Song, Yongxu Xu, Xinrong Li, Jingsong Wang, Jiawei He, Jiaxu Qu, Zheng Li, Xiaofei Li, Wenqiang Lin, Jiannan Chen, Caixing Fu, Zhi Hong Hang
The control of the pseudospin of sound wave has attracted increasing attention in recent years. Utilizing the finite-size effect of topological acoustics, we successfully construct an H-shaped acoustic topological pseudospin switcher that sound wave energy can be easily switched through different passages. The interesting phenomenon of pseudospin flipping is numerically and experimentally demonstrated
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Structural transition, electric transport, and electronic structures in the compressed trilayer nickelate La4Ni3O10 Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-29 Jingyuan Li, Cui-Qun Chen, Chaoxin Huang, Yifeng Han, Mengwu Huo, Xing Huang, Peiyue Ma, Zhengyang Qiu, Junfeng Chen, Xunwu Hu, Lan Chen, Tao Xie, Bing Shen, Hualei Sun, Dao-Xin Yao, Meng Wang
Atomic structure and electronic band structure are fundamental properties for understanding the mechanism of superconductivity. Motivated by the discovery of pressure-induced high-temperature superconductivity at 80 K in the bilayer Rud-dlesden-Popper nickelate La3Ni2O7, the atomic structure and electronic band structure of the trilayer nickelate La4Ni3O10 under pressure up to 44.3 GPa are investigated
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Consecutive narrow and broad quasi-periodic fast-propagating wave trains associated with a flare Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-27 Xinping Zhou, Yuandeng Shen, Chengrui Zhou, Zehao Tang, Ahmed Ahmed Ibrahim
The excitation mechanism of coronal quasi-period fast-propagating (QFP) wave trains remains unresolved. Using Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory observations, we study a narrow and a broad QFP wave trains excited one after another during the successive eruptions of filaments hosted within a fan-spine magnetic system on October 20, 2013. The consecutive occurrence of
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Superexchange and charge transfer in the nickelate superconductor La3Ni2O7 under pressure Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-26 Wéi Wú, Zhihui Luo, Dao-Xin Yao, Meng Wang
Recently, a bulk nickelate superconductor La3Ni2O7 is discovered at pressures with a remarkable high transition temperature Tc ∼ 80 K. Here, we study a Hubbard model with tight-binding parameters derived from ab initio calculations of La3Ni2O7, by employing large scale determinant quantum Monte Carlo and cellular dynamical mean-field theory. Our result suggests that the superexchange couplings in this
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3D nano-printed geometric phase metasurfaces for generating accelerating beams with complex amplitude manipulation Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-26 Tianchen Tang, Saima Kanwal, Yongzheng Lu, Yuelong Li, Shuangbao Wu, Lei Chen, Ziheng Qian, Zhouyu Xie, Jing Wen, Dawei Zhang
Metasurface, a forefront in emerging optical devices, has demonstrated remarkable potential for complex amplitude manipulation of light beams. However, prevailing approaches face challenges in spatial resolution and complexities associated with integrating dynamic phases, impeding the simplified design and reproducible fabrication of metasurfaces. Here, we introduce an innovative approach for complex
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Kerr black hole shadows cast by extraordinary light rays with Weyl corrections Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-26
Abstract We investigate the equation of motion for photons with Weyl corrections in a Kerr black hole spacetime in a small coupling case. Our results show that Weyl corrections yield phenomena of birefringence. The light rays propagating in the spacetime are separated into the ordinary rays and the extraordinary rays, and the propagation of the latter depends on the corrections. We probe the effects
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A quantum federated learning framework for classical clients Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-19 Yanqi Song, Yusen Wu, Shengyao Wu, Dandan Li, Qiaoyan Wen, Sujuan Qin, Fei Gao
Quantum federated learning (QFL) enables collaborative training of a quantum machine learning (QML) model among multiple clients possessing quantum computing capabilities, without the need to share their respective local data. However, the limited availability of quantum computing resources poses a challenge for each client to acquire quantum computing capabilities. This raises a natural question:
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Strain-enhanced polarization sensitivity in β-Ga2O3 photodetector Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-12 Yonghui Zhang, Huili Liang, Fei Xing, Qiqian Gao, Yu Feng, Yuping Sun, Zengxia Mei
Polarization-sensitive photodetection and imaging have great application value in fields such as polarization division multiplexing optical communication, remote sensing, near-field imaging and military monitoring. Pursuing a high polarization ratio has always been the research hotspot in polarization-sensitive photodetectors. In this paper, we report a compression strain enhanced polarization ratio
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Numerical and experimental study of the effects of wind turbine operation on sand-dust transport characteristics Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-11 Gaosheng Ma, Hong Han, Ye Li, Deshun Li, Yan Wang, Ning Fu, Quan Zheng, Rennian Li
Given factors such as reduced land availability for onshore wind farms, wind resource enrichment levels, and costs, there is a growing trend of establishing wind farms in deserts, the Gobi, and other arid regions. Therefore, the relationship between sand-dust weather environments and wind turbine operations has garnered significant attention. To investigate the impact of wind turbine wakes on sand-dust
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Chirality enables thermal magnon transistors Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-11 Tao Yu, Chengyuan Cai, Gerrit E. W. Bauer
We report a theory of thermal spin pumping into proximity magnets under a transverse-bias-driven heat flow of magnons in magnetic films when the dipolar coupling to the magnetic gate is tuned to be “chiral”. While there is no rectification of the magnon current in the film, we predict that chirality diverts a large percentage (50% for perfect chirality) of it into the gate. This transverse thermal
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Color-kinematics duality and dual conformal symmetry for a four-loop form factor in $$\mathcal{N}$$ = 4 SYM Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-11
Abstract We obtain the integrand of full-color four-loop three-point form factor of the stress-tensor supermultiplet in \(\mathcal{N}\) = 4 SYM, based on the color-kinematics (CK) duality and generalized unitarity method. Our result not only manifests all dual Jacobi relations via CK duality but also contains 133 free parameters. This suggests the constructibility of the form factor at even higher
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Enhanced wide-angle third-harmonic generation in flat-band-engineered quasi-BIC metagratings Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-11 Yijia Zang, Ruoheng Chai, Wenwei Liu, Zhancheng Li, Hua Cheng, Jianguo Tian, Shuqi Chen
Nonlinear metasurfaces and photonic crystals provide a significant way to generate and manipulate nonlinear signals owing to the resonance- and symmetry-based light-matter interactions supported by the artificial structures. However, the nonlinear conversion efficiency is generally limited by the angular dispersion of optical resonances especially in nonparaxial photonics. Here, we propose a metagrating
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Room-temperature phonon-coupled single-photon emission in hexagonal boron nitride Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-08
Abstract Photon-lattice (phonon) coupling is fundamental to light-matter interaction, particularly when it reaches the quantum limit of the phonon-coupled single-photon emission, which holds great potential for quantum manipulation and quantum information transduction. Here, we report single defect state-phonon coupling in hexagonal boron nitride (hBN) at room temperature. An ultrabroad spectrum of
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Robust boundary-induced bulk propagations in elastic waveguides with nonplanar surfaces Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-08 Baizhan Xia, Jielong Zhang, Zihan Jiang, Jianting Liu
Trivial elastic waveguides induced by line defects and nontrivial elastic waveguides protected by topological edge states have been extensively examined in planar waveguide systems. Despite these investigations, little is known about topologically protected bulk states and their resulting robust transmission properties, especially in nonplanar elastic waveguides with folded, curved, and twisted surfaces
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Gravitational waves and primordial black hole productions from gluodynamics by holography Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-08 Song He, Li Li, Zhibin Li, Shao-Jiang Wang
Understanding the nature of quantum chromodynamics (QCD) matter is important but challenging due to the presence of non-perturbative dynamics under extreme conditions. We construct a holographic model describing the gluon sector of QCD at finite temperatures in the non-perturbative regime. The equation of state as a function of temperature is in good accordance with the lattice QCD data. Moreover,
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Optical system for extremely large spectroscopic survey telescope Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-07 Ding-qiang Su, Hua Bai, Xiangyan Yuan, Xiangqun Cui
This article presents research work on a spectroscopic survey telescope. Our idea is as follows: for such a telescope, a pure reflecting optical system is designed, which should have an aperture and a field of view (FOV) both as large as possible and excellent image quality, and then a strip lensm (lens-prism) atmospheric dispersion corrector (S-ADC) is added, only for correcting the atmospheric dispersion
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Cosmological interpretation for the stochastic signal in pulsar timing arrays Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-07 Yu-Mei Wu, Zu-Cheng Chen, Qing-Guo Huang
The pulsar timing array (PTA) collaborations have recently reported compelling evidence for a stochastic signal consistent with a gravitational-wave background. In this paper, we combine the latest data sets from NANOGrav, PPTA, and EPTA to explore cosmological interpretations for the PTA signal from first-order phase transitions, domain walls, and cosmic strings, respectively. We find that the domain
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Hybridization-mediated quasiparticle and phonon dynamics in single crystal cerium films Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-07 Yunhe Pei, Yi Wu, Kai Hu, Zhengxing Wei, YiFeng Yang, Yang Liu, Jingbo Qi
We report the ultrafast optical pump-probe spectroscopy measurements on the single-crystal cerium films. Our experimental results of temperature-dependent quasiparticle dynamics reveal development of the hybridization between localized f moments and conduction electrons, i.e., evolving from fluctuating hybridization to collective hybridization. Exotic phonon renormalization is discovered to appear
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Single-shot phase retrieval for randomly fluctuated and obstructed vortex beams Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-07 Hao Zhang, Jun’an Zhu, Xingyuan Lu, Zhiquan Hu, Jianbo Gao, Kun Liu, Qiwen Zhan, Yangjian Cai, Chengliang Zhao
Vortex beams with orbital angular momentum play a crucial role in increasing the information capacity in optical communications. The magnitude of orbital angular momentum determines the ability of information encoding. In practice, a vortex beam can encounter random objects or turbulence during free-space propagation, resulting in information damage. Therefore, accurately measuring the orbital angular
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Uncovering hidden nodes and hidden links in complex dynamic networks Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-01 Zhaoyang Zhang, Xinyu Wang, Haihong Li, Yang Chen, Zhilin Qu, Yuanyuan Mi, Gang Hu
Inferring network structures from available data has attracted much interest in network science; however, in many realistic networks, only some of the nodes are perceptible while others are hidden, making it a challenging task. In this work, we develop a method for reconstructing the network with hidden nodes and links, taking account of fast-varying noise and time-delay interactions. By calculating
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Determination of molecular energies via variational-based quantum imaginary time evolution in a superconducting qubit system Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-01 Zhiwen Zong, Sainan Huai, Tianqi Cai, Wenyan Jin, Ze Zhan, Zhenxing Zhang, Kunliang Bu, Liyang Sui, Ying Fei, Yicong Zheng, Shengyu Zhang, Jianlan Wu, Yi Yin
As a valid tool for solving ground state problems, imaginary time evolution (ITE) is widely used in physical and chemical simulations. Different ITE-based algorithms in their quantum counterpart have recently been proposed and applied to some real systems. We experimentally realize the variational-based quantum imaginary time evolution (QITE) algorithm to simulate the ground state energy of hydrogen
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Experimental observation of multiple topological nodal structure in LaSb2 Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-06 Yuxi Qiao, Fuyi Wang, Huaiqiang Wang, Zicheng Tao, Zhicheng Jiang, Zhengtai Liu, Soohyun Cho, Fayuan Zhang, Qingkai Meng, Wei Xia, Yichen Yang, Zhe Huang, Jishan Liu, Zhonghao Liu, Zengwei Zhu, Shan Qiao, Yanfeng Guo, Haijun Zhang, Dawei Shen
Unconventional fermions in the immensely studied topological semimetals are the source for rich exotic topological properties. Here, using symmetry analysis and first-principles calculations, we propose the coexistence of multiple topological nodal structure in LaSb2, including topological nodal surfaces, nodal lines and in particular eightfold degenerate nodal points, which have been scarcely observed
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Experimental observation of the significant difference between surface and bulk Kondo processes in Kondo lattice YbCu2Si2 Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-06
Abstract Synchrotron-based angle-resolved photoemission spectroscopy was employed to investigate the temperature evolution of the Yb 4f spectral for surface and bulk in the Kondo lattice YbCu2Si2. Our study quantitatively distinguishes between the surface and bulk hybridization processes, revealing that the onset temperatures for both surface and bulk hybridization processes are significantly higher
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Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd2As2 Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-06 Yuxiang Wang, Jianwen Ma, Jian Yuan, Wenbin Wu, Yong Zhang, Yicheng Mou, Jiaming Gu, Peihong Cheng, Wu Shi, Xiang Yuan, Jinglei Zhang, Yanfeng Guo, Cheng Zhang
EuCd2As2 was theoretically predicted to be a minimal model of Weyl semimetals with a single pair of Weyl points in the ferromagnet state. However, the heavily p-doped EuCd2As2 crystals in previous experiments prevent direct identification of the semimetal hypothesis. Here, we present a comprehensive magneto-transport study of high-quality EuCd2As2 crystals with ultralow bulk carrier density (1013 cm−3)
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Nonreciprocal generation of Schrödinger cat state induced by topology Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-03-01 Zi-Hao Li, Li-Li Zheng, Ying Wu, Xin-You Lü
The Schrödinger cat state produced differently in two directions is anticipated to be a critical quantum resource in quantum information technologies. By exploring the interplay between quantum nonreciprocity and topology in a one-dimensional microcavity array, we obtain the Schrödinger cat state (a pure quantum state) in a chosen direction at the edge cavity, whereas a classical state in the other
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Unconventional phonon spectra and obstructed edge phonon modes Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-02-29 Ruihan Zhang, Haohao Sheng, Junze Deng, Zhong Fang, Zhilong Yang, Zhijun Wang
Based on the elementary band representations (EBR), many topologically trivial materials are classified as unconventional ones (obstructed atomic limit), where the EBR decomposition for a set of electronic states is not consistent with atomic valence-electron band representations. In the work, we identify that the unconventional nature can also exist in phonon spectra, where the EBR decomposition for
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High-pressure synthesis of a ternary yttrium-sulfur hydride superconductor with a high Tc of approximately 235 K Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-02-04 Kexin Zhang, Wuhao Chen, Yuchen Zhang, Jianning Guo, Su Chen, Xiaoli Huang, Tian Cui
Ternary hydrides have attracted considerable worldwide attention owing to their potential high-temperature superconducting phases. In contrast to previously reported alloy-based ternary hydrides, we selected the rare earth metal yttrium and light element sulfur to form new yttrium-sulfur hydride superconductors as the target at high pressure, which also linked the two categories of binary clathrate
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Unveiling the time-temperature dependence of metastability of supercooled liquid using nano-calorimetry Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-02-04 Yijun Ding, Lijian Song, Zheng Wang, Ruiqi Yu, Junqiang Wang, Lina Hu, Yuanzheng Yue, Edgar D. Zanotto
There is a lack of understanding of both the conversion of an unstable glass into a metastable supercooled liquid (MSL) upon heating and the metastability of MSLs. In this study, we investigated the time- and temperature-dependent metastability of an MSL using an advanced nano-calorimetric technique. The chosen Au-based metallic glass (AuMG) allowed adequate probing of its MSL in a temperature range
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Phenomenology of heavy neutral gauge boson at muon collider Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-02-04 Zongyang Lu, Honglei Li, Zhi-Long Han, Zong-Guo Si, Liuxin Zhao
Heavy neutral gauge boson Z′ is proposed in many new physics models. It has rich phenomena at the future muon collider. We study the properties of Z′ boson with the process of \({\mu ^ +}{\mu ^ -} \to q\bar q,{\mu ^ +}{\mu ^ -} \to {l^ +}{l^ -},{\mu ^ +}{\mu ^ -} \to ZH\) and μ+μ− → W+W−. The discrepancy of Z′ coupling to different types of particles can be shown in the cross section distributions
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Tunable magneto-Seebeck effect in Co2FeSi/MgO/Co2FeSi heterostructure via optimized interfacial engineering Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-02-04 Jingyu Li, Xianbiao Shi, Yurong Jin, Le Ma, Liuming Wei, Chi Zhang, Hang Li, Peng-Fei Liu
Enhancing the tunneling magneto-Seebeck (TMS) ratio and uncovering its underlying mechanism are greatly demanded in spin caloritronics. The magnitude and sign of the TMS effect depend on the type of atom and the stacking order of atoms at the interfaces. Herein, we demonstrate that TMS ratios can be effectively manipulated by altering heterogonous or homogeneous interface through decoration on the
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Resolving aging dynamics of a 3D colloidal glass Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-02-02
Abstract Physical aging is an inherent property of glassy matter, but understanding its microscopic mechanism remains a challenge particularly at the particle level. In this work, we use a confocal microscope to in-situ trace the particle trajectories in a 3D colloidal glass for 73000 s, aiming at resolving the aging dynamics. By calculating the mean square displacement of particle motions, we find
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High-order time-reversal symmetry breaking normal state Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-02-02 Meng Zeng, Lun-Hui Hu, Hong-Ye Hu, Yi-Zhuang You, Congjun Wu
Spontaneous time-reversal symmetry breaking plays an important role in studying strongly correlated unconventional superconductors. When two superconducting gap functions with different symmetries compete, the relative phase channel (θ− ≡ θ1 − θ2) exhibits an Ising-type Z2 symmetry due to the second order Josephson coupling, where θ1,2 are the phases of two gap functions. In contrast, the U(1) symmetry
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Chiral phonon activated spin Seebeck effect in chiral materials Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-02-02 Xiao Li, Jinxin Zhong, Jinluo Cheng, Hao Chen, Huiqian Wang, Jun Liu, Dali Sun, Lifa Zhang, Jun Zhou
Efficient generation of spin polarization is very important for spintronics and quantum computation. In chiral materials without magnetic order nor spin-orbit coupling, we find a new spin selectivity effect—chiral phonon activated spin Seebeck (CPASS) effect. Starting with the nonequilibrium distribution of chiral phonons under a temperature gradient, the CPASS coefficients are computed based on the
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Quasi-two-dimensional strong liquid-like dynamics of surface atoms in metallic glasses Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-02-02
Abstract The fast dynamic properties of the surface of metallic glasses (MGs) play a critical role in determining their potential applications. However, due to the significant difference in thermal history between atomic simulation models and laboratory-made samples, the atomic-scale behaviors of the fast surface dynamics of MGs in experiments remain uncertain. Herein, we prepared model MG films with
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Advancing space-based gravitational wave astronomy: Rapid parameter estimation via normalizing flows Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-01-29 Minghui Du, Bo Liang, He Wang, Peng Xu, Ziren Luo, Yueliang Wu
Gravitational wave (GW) astronomy is witnessing a transformative shift from terrestrial to space-based detection, with missions like Taiji at the forefront. While the transition brings unprecedented opportunities for exploring massive black hole binaries (MBHBs), it also imposes complex challenges in data analysis, particularly in parameter estimation amidst confusion noise. Addressing this gap, we
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High-excited-state splitting and multimode vibrational coupling in Mn4+-activated fluoride phosphor Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-01-23
Abstract Excited-states play a crucial role in the optical absorption and luminescence of solids and hence their accurate information is highly desired. Herein, we attempt to seize the excited-states information of Mn4+ ions in K2SiF6 microcrystals via measuring and calculating their variable-temperature photoluminescence excitation (PLE) spectra. At cryogenic temperatures, an unpredicted splitting
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Symbology of Feynman integrals from twistor geometries Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-01-25 Song He, Jiahao Liu, Yichao Tang, Qinglin Yang
We study the symbology of planar Feynman integrals in dimensional regularization by considering geometric configurations in momentum twistor space corresponding to their leading singularities (LS). Cutting propagators in momentum twistor space amounts to intersecting lines associated with loop and external dual momenta, including the special line associated with the point at infinity, which breaks
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Demonstration of controlled high-dimensional quantum teleportation Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-01-25 Min-Yu Lv, Xiao-Min Hu, Neng-Fei Gong, Tie-Jun Wang, Yu Guo, Bi-Heng Liu, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo
Controlled quantum teleportation (CQT), which is regarded as the prelude and backbone for a genuine quantum internet, reveals the cooperation, supervision, and control relationship among the sender, receiver, and controller in the quantum network within the simplest unit. Compared with low-dimensional counterparts, high-dimensional CQT can exhibit larger information transmission capacity and higher
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A pseudoclassical theory for the wavepacket dynamics of the kicked rotor model Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-01-24
Abstract In this study, we propose a generalized pseudoclassical theory for the kicked rotor model in an attempt to discern the footprints of the classical dynamics in the deep quantum regime. Compared with the previous pseudoclassical theory that applies only in the neighborhoods of the lowest two quantum resonances, the proposed theory is applicable in the neighborhoods of all quantum resonances
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Synergy between CSST galaxy survey and gravitational-wave observation: Inferring the Hubble constant from dark standard sirens Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-01-15 Ji-Yu Song, Ling-Feng Wang, Yichao Li, Ze-Wei Zhao, Jing-Fei Zhang, Wen Zhao, Xin Zhang
Gravitational waves (GWs) from compact binary coalescences encode the absolute luminosity distances of GW sources. Once the redshifts of GW sources are known, one can use the distance-redshift relation to constrain cosmological parameters. One way to obtain the redshifts is to localize GW sources by GW observations and then use galaxy catalogs to determine redshifts from a statistical analysis of redshift
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Stochastic resonance of spinor condensates in optical cavity Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2024-01-03 Zheng-Chun Li, Bixuan Fan, Lu Zhou, Weiping Zhang
Stochastic resonance is a phenomenon in which adding random noise to a system enhances the detection or transmission of a weak signal. It occurs when the noise interacts with the system’s nonlinearity, thus improving signal-to-noise ratio and increasing sensitivity. Although parametric resonances in an atomic spinor Bose-Einstein condensate have been investigated, the question of whether one can observe
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Taiji-TianQin-LISA network: Precisely measuring the Hubble constant using both bright and dark sirens Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2023-12-29 Shang-Jie Jin, Ye-Zhu Zhang, Ji-Yu Song, Jing-Fei Zhang, Xin Zhang
In the coming decades, the space-based gravitational-wave (GW) detectors such as Taiji, TianQin, and LISA are expected to form a network capable of detecting millihertz GWs emitted by the mergers of massive black hole binaries (MBHBs). In this work, we investigate the potential of GW standard sirens from the Taiji-TianQin-LISA network in constraining cosmological parameters. For the optimistic scenario
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Single-step-etched ultra-compact metamaterial grating coupler enabled by a hierarchical inverse design approach Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2023-12-28 Qiao Wang, Ruiqi Luo, Nan Liu, Maojing Hou, Bo Xiong, Guandong Liu, Wei Ma
With the concept of metamaterials introduced into integrated photonics, subwavelength structures have gained popularity for their ability to create devices with ultra-compact size, high performance, and versatile functionalities. However, traditional metamaterial design methods are usually based on empirical templates and physical approximations, lacking the ability to design free-form metamaterial
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The dusty and extremely red progenitor of the type II supernova 2023ixf in Messier 101 Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2023-12-14 Danfeng Xiang, Jun Mo, Lingzhi Wang, Xiaofeng Wang, Jujia Zhang, Han Lin, Lifan Wang
Stars with initial masses in the range of 8–25 solar masses are thought to end their lives as hydrogen-rich supernovae (SNe II). Based on the pre-explosion images of Hubble space telescope (HST) and Spitzer space telescope, we place tight constraints on the progenitor candidate of type IIP SN 2023ixf in Messier 101. Fitting of the spectral energy distribution (SED) of its progenitor with dusty stellar
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(DarkAI) Mapping the large-scale density field of dark matter using artificial intelligence Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2023-12-14 Zitong Wang, Feng Shi, Xiaohu Yang, Qingyang Li, Yanming Liu, Xiaoping Li
Herein, we present a deep-learning technique for reconstructing the dark-matter density field from the redshift-space distribution of dark-matter halos. We built a UNet-architecture neural network and trained it using the COmoving Lagrangian Acceleration fast simulation, which is an approximation of the N-body simulation with 5123 particles in a box size of 500 h−1Mpc. Further, we tested the resulting
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Scintillation Arc from FRB 20220912A Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2023-12-14 Zi-Wei Wu, Robert A. Main, Wei-Wei Zhu, Bing Zhang, Peng Jiang, Jia-Rui Niu, Jin-Lin Han, Di Li, Ke-Jia Lee, Dong-Zi Li, Yuan-Pei Yang, Fa-Yin Wang, Rui Luo, Pei Wang, Chen-Hui Niu, Heng Xu, Bo-Jun Wang, Wei-Yang Wang, Yong-Kun Zhang, Yi Feng, De-Jiang Zhou, Yong-Hua Xu, Can-Min Deng, Yu-Hao Zhu
We present the interstellar scintillation analysis of fast radio burst (FRB) 20220912A during its extremely active episode in 2022 using data from the Five-hundred-meter Aperture Spherical Radio Telescope (FAST). We detect a scintillation arc in the FRB’s secondary spectrum, which describes the power in terms of the scattered FRB signals’ time delay and Doppler shift. The arc indicates that the scintillation
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Exploring hidden-charm and hidden-strange hexaquark states from lattice QCD Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2023-12-14 Hang Liu, Jinchen He, Liuming Liu, Peng Sun, Wei Wang, Yi-Bo Yang, Qi-An Zhang
Based on five different ensembles of newly generated (2+1)-flavor configurations with pion mass of approximately mπ≃(140–310) MeV, we present a lattice analysis of hidden-charm and hidden-strange hexaquarks with the quark content \(usc\bar d\bar s\bar c\). The correlation matrices of two types of operators with JPC = 0++, 0−+, 1++ and 1−− are simulated to extract the masses of the hexaquark candidates
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Imprints of ultralight axions on the gravitational wave and pulsar timing measurement Sci. China Phys. Mech. Astronomy (IF 6.4) Pub Date : 2023-12-14 Ning Xie, Fa Peng Huang
The axion or axion-like particle motivated from a natural solution of strong CP problem or string theory is a promising dark matter candidate. We study the new observational effects of ultralight axion-like particles by the space-borne gravitational wave detector and the radio telescope. Taking the neutron star-black hole binary as an example, we demonstrate that the gravitational waveform could be