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On the coupling of three-level quantum refrigerators in the weak coupling limit J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-04-16 M H Ben Abdou Chakour, A El Allati, Y Hassouni
We propose a model of two identical autonomous quantum refrigerators that interact through their qubits coupled to cold thermal baths. We consider the same specific disposition for each refrigerator related to a three-level system coupled to different thermal baths and, in turn, to a qubit as the object to be cooled. By coupling the two systems, we show that under certain conditions on the model parameters
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Analysis of electron induced single ionisation differential cross-section of CO2 molecules in different kinematics J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-04-16 Alpana Pandey, Ghanshyam Purohit
Theoretical investigations of electron-impact ionisation for carbon dioxide (CO2) in low to intermediate energy ranges are presented. In addition to the energy range, we have estimated triple differential cross-section (TDCS) in coplanar and perpendicular plane geometry. We have calculated the TDCS for electron impact using the modified distorted wave formalism up to the second order. Post-collision
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Faster than a speeding bullet—the 2023 Physics Nobel Prize J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-04-11 Marc Vrakking
Attosecond physics is a novel research field that pursues a better understanding of electron dynamics in atoms, molecules and condensed matter by means of pump-probe experiments where the motion of electrons are tracked with attosecond (1 as = 10−18 s) time resolution. The 2023 Physics Nobel Prize was awarded to three experimental pioneers of the field, who developed the key methods to generate and
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Laser-assisted (e,2e) study with twisted electron beam on H-atom J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-04-09 Neha1, Nikita Dhankhar, Raul Sheldon Pinto, Rakesh Choubisa
We study the laser-assisted twisted electron beam impact ionization of the hydrogen atom in coplanar asymmetric geometry. We develop the theoretical model in the first Born approximation. In the presence of the laser field, we treat the incident and scattered electrons as Volkov waves; the ejected electron, moving in the combined field of the laser and residual ion H+ , as a Coulomb–Volkov wave function
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Auger photoelectron coincidence spectroscopy of molecules adsorbed on a gold wire surface J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-04-08 J Palaudoux, P Lablanquie, R Benbalagh, I Ismail, A Naitabdi, L Huart, D Cubaynes, C Nicolas, D Céolin, J -P Renault, M -A Hervé Du Penhoat, R Dupuy, F Penent
In this paper, we present the results on Auger/photoelectron coincidence spectroscopy (APECS) of molecules—propanethiol and bovine serum albumin (BSA)-deposited on a gold wire surface, using a magnetic bottle electron time-of-flight spectrometer. Although this study is preliminary and conducted under low vacuum (∼10−7 mbar) conditions in comparison to surface science standards, it demonstrates the
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The 3d 2 D 5/2−2 D 3/2 magnetic dipole transition in potassium-like ions J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-04-05 Yuyuan Qian, Chunyu Zhang, Yizhuo Zhang, Jihui Chen, Xiaobin Ding, Liangyu Huang, Yang Yang, Yunqing Fu, Chongyang Chen, Ke Yao
Spectral lines of the magnetic-dipole transition between the 3d2D3/2,5/2 levels of K-like Kr17+, Zr21+, Nb22+, Mo23+, and Ru25+ ions were measured in a compact electron beam ion trap. By means of dedicated calibration methods, the transition wavelengths of Kr17+, Zr21+, and Mo23+ ions reduce uncertainties by at least one order of magnitude and the wavelengths of Nb22+ and Ru25+ ions are measured for
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Derivation of Miller’s rule for the nonlinear optical susceptibility of a quantum anharmonic oscillator J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-04-04 Maximilian T Meyer, Arno Schindlmayr
Miller’s rule is an empirical relation between the nonlinear and linear optical coefficients that applies to a large class of materials but has only been rigorously derived for the classical Lorentz model with a weak anharmonic perturbation. In this work, we extend the proof and present a detailed derivation of Miller’s rule for an equivalent quantum-mechanical anharmonic oscillator. For this purpose
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Cavity output field nonreciprocal control via interference effects J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-04-02 Yang Zhang, Yu-bo Ma, Hong-wei Zhu, Chang-shui Yu
We propose a scheme to investigate the coherent control of the output field in an asymmetrical cavity with and without atom interaction. We show that the system displays the phenomenon of nonreciprocal opacity and that broken cavity spatial symmetry is the sufficient and necessary condition to achieve nonreciprocal opacity when the relative phase of the input fields vanishes. Moreover, we also include
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Excitation and recombination studies with silicon and sulphur ions at an EBIT J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-04-02 I Orban, S Mahmood, T Fritjof, E Lindroth, C Z Dong, J l Rui, L Y Xie, R Schuch
Measurements of electron-impact excitation and recombination rate coefficients of highly charged Si and S ions at the Stockholm electron beam ion trap are reported. The experimental method was a combination of photon detection from the trapped ions during probing and subsequently extraction and time-of-flight (TOF) charge analysis of these ions. The TOF technique allows to measure recombination rate
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Application of a metallic-magnetic calorimeter for high-resolution x-ray spectroscopy of Fe at an EBIT J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-27 M O Herdrich, D Hengstler, S Allgeier, M Friedrich, A Fleischmann, C Enss, S Bernitt, T Morgenroth, S Trotsenko, R Schuch, Th Stöhlker
In this work, we present an experiment conducted at the S-EBIT-I ion trap of GSI. It involved the study of ion-electron collisions of Fe and Ba ions in various charge states with the electron beam. Characteristic x-ray radiation emitted during the continuous interaction was recorded utilizing an energy-dispersive maXs-30 detector based on metallic-magnetic calorimeter (MMC) technology. Optimizations
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Interference effects in Compton scattering of keV photons at H 2+ : a nonrelativistic analytical approach J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-26 Matabara Dieng, Henri Bachau
In this paper we study interference effects in Compton scattering at molecule by keV photons. As a test case we investigate the molecular system H 2+ at the equilibrium internuclear distance and in the dissociative channel. The initial molecular wavefunction is described as a linear combination of atomic orbitals centered on each nucleus. The final continuum state is a two-centre continuum Coulomb
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Entanglement dynamics of two non-Hermitian qubits J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-26 Yi-Xi Zhang, Zhen-Tao Zhang, Xiao-Zhi Wei, Bao-Long Liang, Feng Mei, Zhen-Shan Yang
The evolution of entanglement in a non-Hermitian quantum system may behave differently compared to its Hermitian counterpart. In this paper, we investigate the entanglement dynamics of two coupled and driven non-Hermitian qubits. Through calculating the concurrence of the system, we find that the evolution of the bipartite entanglement manifests two distinct patterns in the parameter space. In the
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Enhanced positron acceleration driven by femto-second laser pulses irradiating structured targets J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-21 S Chintalwad, S Krishnamurthy, S Ghosh, C P Ridgers, B Ramakrishna
We have proposed a compact scheme for generating high-density and high-energy positrons by irradiating different shaped targets with an ultra-intense laser pulse, using 2D particle-in-cell simulations and numerical analysis. Our simulations show that the Breit–Wheeler process dominates positron production during laser-target interaction when a laser with an intensity of 4×1023 Wcm−2 is used. We obtain
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Quantum exchange symmetry induces charge diffusion and trapping in ultracold gases J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-20 M Niranjan, N Joshi, A Pandey, O Dulieu, Robin Côté, S A Rangwala
For a homonuclear ion-atom system, we show that the exchange symmetry leads to special outcomes for ion transport that manifest themselves in ultracold experiments. We compute the two body charge hopping probabilities and rates, which are used to model charge hopping in the dynamics of an ultracold 6/7 Li+ ion immersed within an ultracold gas of 6/7 Li atoms at micro-Kelvin temperatures. We show that
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Modulation transfer spectroscopy of the D1 transition of potassium: theory and experiment J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-20 A D Innes, P Majumder, H R Noh, S L Cornish
We report on a study of modulation transfer spectroscopy of the 4S1/2→4P1/2 (D1) transition of naturally abundant potassium in a room-temperature vapour cell. This transition is critical for laser cooling and optical pumping of potassium and our study is therefore motivated by the need for robust laser frequency stabilisation. Despite the absence of a closed transition, the small ground-state hyperfine
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Generation of interferometrically stable pulse pairs from a free-electron laser using a birefringent interferometer J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-20 B Ardini, F Richter, L Uboldi, P Cinquegrana, M Danailov, A Demidovich, S D Ganeshamandiram, S Hartweg, G Kurdi, F Landmesser, M Michelbach, A Ngai, I Nikolov, N Rendler, F Stienkemeier, D Uhl, L Bruder, G Cerullo, C Manzoni
We present a compact, intrinsically stable common path interferometer for the seeding of free-electron lasers (FELs). The interferometer can handle the required ultraviolet seed wavelengths and features an excellent phase stability of 10 mrad at 265 nm. By seeding the FEL FERMI, we demonstrate the generation of extreme ultraviolet (XUV) pulse pairs with tunable delay and a delay stability of 6 as at
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Imagining density distribution of molecular orbitals in IR+XUV co-rotating circular laser fields by frequency-domain theory J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-20 Yu-Hong Li, Facheng Jin, Yujun Yang, Fei Li, Ying-Chun Guo, Zhi-Yi Wei, Jing Chen, Xiaojun Liu, Bingbing Wang
We have investigated the angle-resolved ATI spectrum of oriented molecules in the IR+XUV co-rotating circular laser fields. According to the different roles of IR and XUV laser in the ionization process, we purposefully adjust the photon energy of XUV and the intensity of IR laser to make the ionization spectrum of the molecule distributed in a suitable momentum region. Moreover, under the same laser
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Quantum optics in MATLAB J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-18 Nilakantha Meher
We provide a MATLAB numerical guide at the beginner level to support students starting their research careers in theoretical quantum optics and related areas. These resources are also valuable for undergraduate and graduate students working on semester projects in similar fields.
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Charge exchange of slow highly charged ions from an electron beam ion trap with surfaces and 2D materials J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-18 A Niggas, M Werl, F Aumayr, R A Wilhelm
Electron beam ion traps allow studies of slow highly charged ion transmission through freestanding 2D materials as an universal testbed for surface science under extreme conditions. Here we review recent studies on charge exchange of highly charged ions in 2D materials. Since the interaction time with these atomically thin materials is limited to only a few femtoseconds, an indirect timing information
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Using ‘designer’ coherences to control electron transfer in a model bis(hydrazine) radical cation: can we still distinguish between direct and superexchange mechanisms? J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-14 Mercè Deumal, Jordi Ribas-Ariño, Michael A Robb
We have simulated two mechanisms, direct and superexchange, for the electron transfer in a model Bis(hydrazine) Radical Cation, which consists of two hydrazine moieties coupled by a benzene ring. The computations, that are inspired by the attochemistry approach, focus on the electron dynamics arising from a coherent superposition of four cationic states. The electron dynamics, originating from a solution
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Both experimental and molecular dynamics approaches highlight the central role of interfacial water for radical production by irradiated gold nanoparticles J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-13 Emilie Brun, Rika Tandiana, Manon Gilles, Yannis Cheref, Nguyen-Thi Van-Oanh, Carine Clavaguera, Cécile Sicard-Roselli
Nanoparticles devoted to improve radiotherapy treatments are an efficient tool if they can induce the formation of deleterious species in the tumor. Their interaction with radiation is responsible for radical production but in spite of the numerous studies mostly with cells, no consensus has been reached about radical formation mechanism. In order to gain knowledge in the physico-chemical step of this
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Production and protection of entanglement via vacuum induced coherences J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-13 Anjali N Nair, R Arun
The entanglement dynamics of a pair of three-level V-type atoms decaying spontaneously in a common vacuum reservoir is investigated. Under the condition that the decaying transitions in the atoms have parallel dipole moments, the effect of coherences induced by spontaneous emission is considered in the atomic dynamics. We show that vacuum-induced coherence (VIC) and collective effects in atomic decay
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Controllable single-photon transport mediated by a time-modulated Jaynes–Cummings model J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-12 Haozhen Li, Yang Lan, Ran Zeng, Miao Hu, Mengmeng Xu, Xiuwen Xia, Jingping Xu, Yaping Yang
Controllable single-photon scattering in a one-dimensional waveguide coupled to a Jaynes–Cummings structure containing a time-modulated two-level atom interacting with a single-mode cavity is investigated. The photon transmission and reflection amplitudes are calculated by using an effective Floquet Hamiltonian in real space. The results show that the coupling between the atom and the cavity mode can
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Vector gap solitons of spin-orbit-coupled Bose-Einstein condensate in square optical lattice J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-12 Qingqing Wang, Pu Tu, Jinping Ma, Kaihua Shao, Xi Zhao, Baolong Xi, Yan Song, Yuren Shi
Vector gap solitons in quasi-two-dimensional Bose–Einstein condensate loaded in a square optical lattice with spin-orbit and Rabi coupling are investigated theoretically. The solitons are obtained by the Newton-Conjugate-Gradient method for various physical parameters. The stability properties of gap solitons are theoretically analyzed by direct nonlinear dynamical evolution. It is found that the existence
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High harmonic generation in monolayer indium nitride J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-12 Xiaoyu Liu, Zhiqiang Ji, Chenglong Wu, Shasha Li, Hong Wu, Feng Li, Yong Pu
In our work, we theoretically investigate high harmonic generation (HHG) in monolayer hexagonal indium nitride (h-InN) based on the semiconductor Bloch equation under strong laser fields. Compared with h-BN, there is no multiplateau in h-InN. This is because the intraband mechanism dominates the total HHG, and the harmonic generated by the intraband current is about three orders of magnitude higher
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Comment on ‘Thermodynamic relations and ro-vibrational energy levels of the improved Pöschl-Teller oscillator for diatomic molecules’ J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-11 Francisco M Fernández
We argue that the canonical partition function derived by Eyube et al (2021 J. Phys. B 5 155102) is not correct because the authors did not take into account the contribution of the rotational degrees of freedom. Consequently, the thermodynamic functions derived from it are unsuitable for any physical application.
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Self-bound droplets with uncorrelated disordered potentials J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-07 Karima Abbas, Abdelâali Boudjemâa
We investigate the effects of an external random δ-correlated potential on the bulk properties of self-bound droplets in three-dimensional binary Bose–Einstein condensates. The ground-state energy and the quantum fluctuation induced by disorder are computed utilizing the Bogoliubov theory. We provide a comprehensive stability phase-diagram for the resulting dirty droplets. At finite temperature, we
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Convolutional neural network for retrieval of the time-dependent bond length in a molecule from photoelectron momentum distributions J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-06 N I Shvetsov-Shilovski, M Lein
We apply deep learning for retrieval of the time-dependent bond length in the dissociating two-dimensional H 2+ molecule using photoelectron momentum distributions. We consider a pump-probe scheme and calculate electron momentum distributions from strong-field ionization by treating the motion of the nuclei classically, semiclassically or quantum mechanically. A convolutional neural network trained
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Measurement of steep dispersion associated with magnetically assisted gain in Zeeman degenerate two-level system of cold atoms J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-04 J C de Aquino Carvalho, R S N Moreira, J W R Tabosa
We report on the measurements of magnetically assisted dispersion and gain in a Zeeman degenerate two-level system associated with the closed D 2 hyperfine transition Fg=3→Fe=2 cold cesium atoms. We use a Mach–Zehnder interferometer to measure the dispersive properties of this system in the presence of a magnetic field, transversal to the quantization direction, when the atomic system is excited by
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Competition of multiphoton ionization pathways in lithium J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-04 Balázs Tóth, Attila Tóth, András Csehi
We study the three-photon ionization of atomic lithium by intense, short light pulses, via numerically solving the time-dependent Schrödinger equation. Two-photon Rabi oscillations are induced between the 2s and 4s states, which are damped due to single-photon ionization to the p continuum. Developing a minimal three-level model, we analyze the spectral features of the Autler–Townes (AT) doublet that
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L-Mn dielectronic recombination of cerium ions in a room-temperature EBIT J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-04 W Biela-Nowaczyk, F Grilo, P Amaro, A Warczak
We explore the dielectronic recombination structures at the electron beam ion trap at Jagiellonian University in Cracow, emited by cerium that is produced by the high-current cathode made of iridium and cerium. Small amounts of these elements evaporate from the cathode and form low-intensity admixtures within the electron-ion plasma in the EBIT. Their presence and specific ionic population can be observed
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Targeted optimization in small-scale atomic structure calculations: application to Au I J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-04 Sema Caliskan, Jon Grumer, Anish M Amarsi
The lack of reliable atomic data can be a severe limitation in astrophysical modelling, in particular of events such as kilonovae that require information on all neutron-capture elements across a wide range of ionization stages. Notably, the presence of non-orthonormalities between electron orbitals representing configurations that are close in energy can introduce significant inaccuracies in computed
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Azimuthal phase-dependent electromagnetically induced transparency and the generation of spatial light in a microwave-assisted four-level Y-type system J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-01 Samim Akhtar, Jayanta K Saha, Md Mabud Hossain
We present an azimuthal phase-dependent scheme to study the spatially dependent electromagnetically induced transparency (EIT) and the generation of spatial light in a closed-loop four-level Y-type system. A structured control beam and a microwave (MW) field are adopted in the closed-loop structure. Interestingly, the weak non-vortex probe beam responses explicitly depend on the orbital angular momentum
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Experimental and theoretical Ritz–Rydberg analysis of the electronic structure of highly charged ions of lead and bismuth by optical spectroscopy J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-03-01 Michael K Rosner, Nils-Holger Rehbehn, José R Crespo López-Urrutia
Intra-configuration fine-structure transitions in highly charged ions (HCIs) result in most cases from changes in the coupling of equivalent electrons. They are multipole forbidden to varying degrees and often occur within the optical range. In HCI with semi-filled nd and nf subshells, electrons can in principle couple to states which are energetically close but with very different total angular momenta
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Simulations of the correlated momentum distributions for nonsequential double ionization of neon in elliptically polarized laser fields J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-26 Zhangjin Chen, Qinghua Chen, Huipeng Kang, Toru Morishita
We use the improved quantitative rescattering (QRS) model to simulate the experimentally measured correlated two-electron momentum distributions (CMDs) for nonsequential double ionization (NSDI) of Ne exposed to intense elliptically polarized laser pulses with a central wavelength of 788 nm at a peak intensity of 5 ×1014 W cm−2 for the ellipticities ranging from 0 to 0.25 (Kang et al 2018 Phys. Rev
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Corrigendum: Exploring the role of beyond mean-field interaction in the structure and dynamics of one-dimensional quantum droplets (2023 J. Phys. B: At. Mol. Opt. Phys. 56 165302) J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-23 Sonali Gangwar, Rajamanickam Ravisankar, Paulsamy Muruganandam, Pankaj Kumar Mishra
In our recent paper (Gangwar et al 2023 J. Phys. B: At. Mol. Opt. Phys. 56 165302), we noticed a minor mistake in equations (1) and (2). In this corrigendum, we provide the corrected equations and necessary modified figures. However, overall results and conclusions of our original paper remain unchanged.
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Production of twisted particles in magnetic fields J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-23 Liping Zou, Pengming Zhang, Alexander J Silenko
The use of a (quasi)uniform magnetic field opens new possibilities for the production of twisted particles having orbital angular momenta. We ascertain these possibilities. Quantum states suitable for the creation of charged particles in a uniform magnetic field are determined. The particle penetration from a solenoid to vacuum or another solenoid is analyzed in detail. It is shown that a previously
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Quantum degeneracy and spin entanglement in ideal quantum gases J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-23 Fatma Zouari Ahmed, Mohammed Tayeb Meftah, Tommaso Roscilde
Quantum degeneracy is the central many-body feature of ideal quantum gases stemming from quantum mechanics. In this work we address its relationship to the most fundamental form of non-classicality in many-body system, i.e. many-body entanglement. We aim at establishing a quantitative link between quantum degeneracy and entanglement in spinful ideal gases, using entanglement witness criteria based
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Critical exponents and fluctuations at BEC in a 2D harmonically trapped ideal gas J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-22 M I Morales-Amador, V Romero-Rochín, R Paredes
The critical properties displayed by an ideal 2D Bose gas trapped in a harmonic potential are determined and characterized in an exact numerical fashion. Beyond thermodynamics, addressed in terms of the global pressure and volume which are the appropriate variables of a fluid confined in a non-uniform harmonic potential, the density-density correlation function is also calculated and the corresponding
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Classical-trajectory model for ionizing proton-ammonia molecule collisions: the role of multiple ionization J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-21 Alba Jorge, Marko Horbatsch, Tom Kirchner
We use an independent electron model with semi-classical approximation to electron dynamics to investigate differential cross sections for electron emission in fast collisions of protons with ammonia molecules. An effective potential model for the electronic orbitals is introduced, and utilized in the context of the classical-trajectory Monte Carlo (CTMC) approach for single-electron dynamics. Cross
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Generalized binary-encounter-Bethe model for electron impact ionization of atoms J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-21 Yuan-Cheng Wang, Li Guang Jiao, Stephan Fritzsche
A generalized binary-encounter-Bethe (GBEB) model is proposed to calculate the partial ionization cross sections of all shells. The present model improves the original version of Kim et al (2000 Phys. Rev.A 62 052710) by incorporating a physically constructed effective charge felt by the ejected electron in the empirical factor, which prevents the selection of specific factors for different shells
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Study of state-selective single-electron capture in slow Ne7+ colliding with He and H2 target J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-14 X B Zhu, D D Xing, K Z Lin, S C Cui, X L Zhu, Y Gao, D L Guo, D M Zhao, S F Zhang, X Ma
Using the cold target recoil-ion momentum spectroscopy, we measured the state-selective single electron capture in collisions of 3.5–6.3 keV u−1 Ne7+ ions and He and H2. The Q-value spectra and angular distributions as a function of the projectile incident energy were obtained. The results show that the single electron capture into n = 4 states is the dominant reaction channel for the Ne7+-He system
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Two-center resonant photoionization-excitation driven by combined intra- and interatomic electron correlations J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-12 S Kim, S Steinhäuser, A B Voitkiv, C Müller
Ionization-excitation of an atom induced by the absorption of a single photon in the presence of a neighboring atom is studied. The latter is, first, resonantly photoexcited and, afterwards, transfers the excitation energy radiationlessly to the other atom, leading to its ionization with simultaneous excitation. The process relies on the combined effects of interatomic and intraatomic electron correlations
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Propagation properties and stability of dark solitons in weakly interacting Bose–Bose droplets J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-12 Jakub Kopyciński, Buğra Tüzemen, Wojciech Górecki, Krzysztof Pawłowski, Maciej Łebek
We investigate dark solitons in two-component Bose systems with competing interactions in one dimension. Such a system hosts a liquid phase stabilized by the beyond-mean field corrections. Using the generalized Gross–Pitaevskii equation, we reveal the presence of two families of solitonic solutions. The solitons in both of them can be engineered to be arbitrarily wide. One family of solutions, however
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Sub-Doppler laser cooling and magnetic trapping of natural-abundance fermionic potassium J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-09 Mateusz Bocheński, Mariusz Semczuk
We demonstrate the largest number of 40K atoms that has ever been cooled to deeply sub-Doppler temperatures in a single-chamber apparatus without using an enriched source of potassium. With gray molasses cooling on the D 1-line following a standard D 2-line magneto-optical trap, we obtain 3×105 atoms at 10(2) µK. We reach densities high enough to measure the temperature via absorption imaging using
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Energy and angular distributions in 250 eV electron and positron collisions with argon atom J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-07 K Tőkési, R D DuBois
We present energy and angular differential cross sections for single-ionization in collisions between electrons and positrons with argon atoms at 250 eV. We treat the collision classically using the three body approximation where the target atoms are described within the single active electron approximation using a Garvey model potential and only the outermost electron is involved in the collision
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Statistical RTA simulations of atomic data for astrophysical opacity modeling in the context of kilonova emission J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-07 H Carvajal Gallego, J-C Pain, M Godefroid, P Palmeri, P Quinet
When considering some complex lanthanide ions characterized by a half-filled 4f subshell, the atomic structure Hamiltonian matrix sizes are so large that their diagonalization is challenging and therefore the atomic data of these ions are only used to compute the expansion opacity of a kilonova with difficulty. To avoid this problem, we propose a statistical simulation method to compute kilonova expansion
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Photoionization cross sections of Ethylene oxide J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-05 Jhenifer M H Fófano, Mylena H Ribas, Milton M Fujimoto
In this work a theoretical study for photoionization of Ethylene oxide is presented. The photoionization cross section (PICS) for each of the nine valence orbitals and also the summed cross sections are presented. Electronic structure calculations are done to obtain the required molecular properties and the Variational Schwinger method with Padé approximants is used to calculate the PICS. The results
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Proposal for composite quantum electromagnetically induced transparency heat engine coupled by a nanomechanical mirror J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-05 Rejjak Laskar
This paper introduces a quantum heat engine model that utilizes an ultracold atomic gas coupled with a nanomechanical mirror. The mirror’s vibration induces an opto-mechanical sideband in the control field, affecting the behavior of the cold gas and subsequently influencing the output radiation of the engine. The model incorporates mirror vibration while omitting cavity confinement, establishing a
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A data-driven machine learning approach for electron-molecule ionization cross sections J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-02 A L Harris, J Nepomuceno
Despite their importance in a wide variety of applications, the estimation of ionization cross sections for large molecules continues to present challenges for both experiment and theory. Machine learning (ML) algorithms have been shown to be an effective mechanism for estimating cross section data for atomic targets and a select number of molecular targets. We present an efficient ML model for predicting
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Compact gap solitons and compact edge states of exciton–polariton condensates with spin–orbit coupling in a one-dimensional flatband lattice J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-02 Szu-Cheng Cheng, Ting-Wei Chen
We propose that the compact gap solitons and compact edge states can be excited in a flatband of the incoherently-pumped exciton–polariton condensate under a one-dimensional periodic potential lattice. The combined effects of spin–orbit coupling and periodic potential depth on the flatband structures are investigated. Then how the compact gap solitons and edge states are localized and extended inside
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Hybrid magnon-photon system for sensing weak phase J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-02-02 Jia-Yun Han, Zhao-Peng Tian, Yu-Di Cheng, Hai-Bo Huang, Xue-Liang Zhou, Wen-Huan Wu, Yuan Zhou, Qing-Lan Wang
It belongs to a hot topic to sense or detect the weak and even ultra-weak physical quantities by utilizing quantum platforms and methods. We here propose a hybrid magnon-photon system of the yttrium iron garnet (YIG) magnon mode coupled to a microwave cavity, which also includes another degree of freedom with respect to the thermal vibration of this YIG microsphere. In this quasi-tripartite coupling
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Inner-shell photoelectron spectroscopy unveils the interplay between hydrogen bonds and π−π stacking in clusters of biomolecules in the gas phase: hypoxanthine clusters as a case study J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-31 Darío Barreiro-Lage, Giuseppe Mattioli, Chiara Nicolafrancesco, Patrick Rousseau, Aleksandar R Milosavljević, Sergio Díaz-Tendero
We present a joint theoretical-experimental study on the inner-shell photoionization of hypoxanthine clusters in the gas phase. Simulations were performed using a computational strategy that combines molecular dynamics to explore the conformers of the clusters, density functional theory for geometry optimization and inner shell photoionization calculations. Two main intermolecular interactions are
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Quantum dynamics of positron-hydrogen scattering and three-body bound state formation with an assisting laser field: predictions of a reduced-dimensionality model J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-25 Xiao Hu Ji, Li Guang Jiao, Aihua Liu, Yong Zhi Zhang, Uwe Thumm, Yew Kam Ho
We investigate the quantum dynamics of target excitation and positronium formation in the positron-hydrogen atom scattering without and with an external assisting laser field within a reduced-dimensional quantum model. Strong interference fringes between the incident and reflected positron wave packets are observed in the reaction region. We further investigate the critical behavior of transition probabilities
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Electron scattering and transport in simple liquid mixtures J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-24 G J Boyle, N A Garland, R P McEachran, K A Mirihana, R E Robson, J P Sullivan, R D White
The theory for electron transport in simple liquids developed by Cohen and Lekner (1967 Phys. Rev. 158 305), is extended to simple liquid mixtures. The focus is on developing benchmark models for binary mixtures of hard-spheres, using the Percus-Yevick model (Lebowitz 1964 Phys. Rev. A 133 895, Hiroike 1969 J. Phys. Soc. Japan 27 1415) to represent the density structure effects. A multi-term solution
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Research on the influence of intra-cavity dispersion on pulse characteristics of a quartic soliton fiber laser J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-22 Honglin Wen, Lie Liu, Ying Han, Xiaotong Gao, Haijun Gu, Yadong Sun, Bo Gao
We numerically investigate the influence of higher-order dispersion on the dynamics of quartic solitons in a passively mode-locked fiber laser. The simulation results show that the output pulse characteristics of the quartic soliton fiber laser are not only affected by the intra-cavity net dispersion but also related to the position of the single-mode fiber (SMF). For different intra-cavity net higher-order
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Electron and ion spectroscopy of camphor doped helium nanodroplets in the extreme UV and soft x-ray regime J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-22 Sanket Sen, S Mandal, S De, Arnab Sen, R Gopal, L Ben Ltaief, S Turchini, D Catone, N Zema, M Coreno, R Richter, M Mudrich, V Sharma, S R Krishnan
We investigate the ionisation and fragmentation dynamics of free camphor molecules and camphor-doped helium nanodroplets by extreme ultraviolet (EUV) and soft x-ray photons using velocity map imaging combined with photoelectron-photoion coincidence (VMI-PEPICO) spectroscopy. We notably find that the Penning ionisation of camphor in He nanodroplets at hν=21.43 eV is soft with nearly identical Penning
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Dissociative electron attachment studies of gas-phase acetic acid using a velocity map imaging technique J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2024-01-04 Dipayan Chakraborty, Giorgi Kharchilava, Ian Carmichael, Sylwia Ptasinska
Advancing instrumentation to explore dissociative electron attachment (DEA) studies allows previously unattainable information to be acquired. Using a newly constructed velocity map imaging spectrometer, we revisited a study on DEA to gas-phase acetic acid. We discuss possible fragmentation channels and compared the corresponding ion yields with previous high electron-energy resolution results. We
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Resonant x-ray difference frequency generation J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-12-19 Carles Serrat
Resonantly enhanced x-ray difference-frequency generation (re-XDFG) is a second-order nonlinear effect that involves illuminating a molecule with two-color x-ray pulses with photon energies Ω1 and Ω2. The energy difference Ω1−Ω2 is tuned to match an x-ray absorption edge of an atom in the molecule. We have numerically studied the re-XDFG effect considering different individual molecules in the gas
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Enhancement of multimode entanglement and asymmetric steering by noiseless linear amplification J. Phys. B: At. Mol. Opt. Phys. (IF 1.6) Pub Date : 2023-12-15 Xiaofeng Wang, Shuqin Zhai
Quantum entanglement and Einstein-Podolsky-Rosen (EPR) steering is an important resource for quantum information. However, it is very fragile and prone to decoherence. Recently, it has been shown that the noiseless linear amplification (NLA) which can be applied to any channel with loss and noise can effectively counteract the effect of quantum decoherence. Besides, the initial quantum correlation