Competition of disorder and electron-phonon coupling in $2H\text{\ensuremath{-}}{\mathrm{TaSe}}_{2\ensuremath{-}x}{\mathrm{S}}_{x}\phantom{\rule{4pt}{0ex}}(0\ensuremath{\le}x\ensuremath{\le}2)$ as evidenced by Raman spectroscopy

Competition of disorder and electron-phonon coupling in $2 H − {TaSe}_{2 - x} S_{x} (0 \leq x \leq 2)$ as evidenced by Raman spectroscopy

J. Blagojević, S. Djurdjić Mijin, J. Bekaert, M. Opačić, Y. Liu, M. V. Milošević, C. Petrović, Z. V. Popović, and N. Lazarević

Phys. Rev. Materials 8, 024004 – Published 21 February 2024

Abstract

The vibrational properties of $2 H − {TaSe}_{2 - x} S_{x}$ $(0 \leq x \leq 2)$ single crystals were probed using Raman spectroscopy and density functional theory calculations. The end members revealed two out of four symmetry-predicted Raman active modes, together with the pronounced two-phonon structure, attributable to the enhanced electron-phonon coupling. Additional peaks become observable due to crystallographic disorder for the doped samples. The evolution of the $E_{2 g}^{2}$ mode Fano parameter reveals that the disorder has a weak impact on electron-phonon coupling, which is also supported by the persistence of two-phonon structure in doped samples. As such, this research provides thorough insights into the lattice properties, the effects of crystallographic disorder on Raman spectra, and the interplay of this disorder with the electron-phonon coupling in $2 H − {TaSe}_{2 - x} S_{x}$ compounds.

Received 16 November 2023
Accepted 31 January 2024

DOI:https://doi.org/10.1103/PhysRevMaterials.8.024004

Physics Subject Headings (PhySH)

Charge density waves Doping effects Electron-phonon coupling First-principles calculations

Raman spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. Blagojević ¹, S. Djurdjić Mijin ^1,2, J. Bekaert ³, M. Opačić ¹, Y. Liu^4,5, M. V. Milošević³, C. Petrović ^4,6,7, Z. V. Popović⁸, and N. Lazarević ¹

¹Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia
²Departamento de Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain
³Department of Physics & NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
⁴Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁵Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou 310058, People's Republic of China
⁶Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments (MFree), Shanghai Advanced Research in Physical Sciences (SHARPS), Pudong, Shanghai 201203, China
⁷Department of Nuclear and Plasma Physics, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade 11001, Serbia
⁸Serbian Academy of Sciences and Arts, Knez Mihailova 35, 11000 Belgrade, Serbia

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Vol. 8, Iss. 2 — February 2024

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Competition of disorder and electron-phonon coupling in 2H−TaSe2−xSx(0≤x≤2) as evidenced by Raman spectroscopy

J. Blagojević, S. Djurdjić Mijin, J. Bekaert, M. Opačić, Y. Liu, M. V. Milošević, C. Petrović, Z. V. Popović, and N. Lazarević

Phys. Rev. Materials 8, 024004 – Published 21 February 2024

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Competition of disorder and electron-phonon coupling in $2 H − {TaSe}_{2 - x} S_{x} (0 \leq x \leq 2)$ as evidenced by Raman spectroscopy