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Title: Monolayer-like lattice dynamics in bulk WSe2

Abstract

Understanding the microscopic lattice dynamics is essential for regulating the thermal properties in two-dimensional layered materials. In transition metal dichalcogenides, the layered structures result in different but closely related phonon dispersions between monolayer and bulk. Here, by combining inelastic X-ray scattering and first-principles calculations, the lattice dynamics of tungsten diselenide (WSe2) was investigated comprehensively, and a monolayer-like lattice dynamics in the bulk WSe2 was revealed. We performed the first temperature-dependent phonon dispersions measurement and obtained the mode Grüneisen parameters of bulk WSe2, which are found to be in better agreement with the calculations on the monolayer system than those of the bulk. This observation indicates that lattice dynamics in bulk WSe2 hold the characteristic of monolayers. The result provides valuable insights into the thermal properties of WSe2-based devices.

Authors:
 [1];  [2];  [1];  [3]; ORCiD logo [1]
  1. Univ. of California, Riverside, CA (United States)
  2. Henan Polytechnic University, Jiaozuo (China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Henan Polytechnic University
OSTI Identifier:
1894139
Grant/Contract Number:  
AC02-06CH11357; 1750786; B2021-12; NSFRF220421
Resource Type:
Accepted Manuscript
Journal Name:
Materials Today Physics
Additional Journal Information:
Journal Volume: 28; Journal ID: ISSN 2542-5293
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; First-principal calculations; Lattice dynamics; Layered material; Phonon dispersion; Thermal conductivity; inelastic X-ray scattering

Citation Formats

Cai, Qingan, Wei, Bin, Sun, Qiyang, Said, Ayman H., and Li, Chen. Monolayer-like lattice dynamics in bulk WSe2. United States: N. p., 2022. Web. doi:10.1016/j.mtphys.2022.100856.
Cai, Qingan, Wei, Bin, Sun, Qiyang, Said, Ayman H., & Li, Chen. Monolayer-like lattice dynamics in bulk WSe2. United States. https://doi.org/10.1016/j.mtphys.2022.100856
Cai, Qingan, Wei, Bin, Sun, Qiyang, Said, Ayman H., and Li, Chen. Tue . "Monolayer-like lattice dynamics in bulk WSe2". United States. https://doi.org/10.1016/j.mtphys.2022.100856. https://www.osti.gov/servlets/purl/1894139.
@article{osti_1894139,
title = {Monolayer-like lattice dynamics in bulk WSe2},
author = {Cai, Qingan and Wei, Bin and Sun, Qiyang and Said, Ayman H. and Li, Chen},
abstractNote = {Understanding the microscopic lattice dynamics is essential for regulating the thermal properties in two-dimensional layered materials. In transition metal dichalcogenides, the layered structures result in different but closely related phonon dispersions between monolayer and bulk. Here, by combining inelastic X-ray scattering and first-principles calculations, the lattice dynamics of tungsten diselenide (WSe2) was investigated comprehensively, and a monolayer-like lattice dynamics in the bulk WSe2 was revealed. We performed the first temperature-dependent phonon dispersions measurement and obtained the mode Grüneisen parameters of bulk WSe2, which are found to be in better agreement with the calculations on the monolayer system than those of the bulk. This observation indicates that lattice dynamics in bulk WSe2 hold the characteristic of monolayers. The result provides valuable insights into the thermal properties of WSe2-based devices.},
doi = {10.1016/j.mtphys.2022.100856},
journal = {Materials Today Physics},
number = ,
volume = 28,
place = {United States},
year = {Tue Oct 04 00:00:00 EDT 2022},
month = {Tue Oct 04 00:00:00 EDT 2022}
}

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