Ultrafast carrier dynamics in the large-magnetoresistance material WTe2

Dai, Y. M.; Bowlan, J.; Li, H.; Miao, H.; Wu, S. F.; Kong, W. D.; Shi, Y. G.; Trugman, S. A.; Zhu, J. -X.; Ding, H.; Taylor, A. J.; Yarotski, D. A.; Prasankumar, R. P.

doi:10.1103/PhysRevB.92.161104

Title: Ultrafast carrier dynamics in the large-magnetoresistance material ${WTe}_{2}$

Journal Article · Wed Oct 07 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.161104· OSTI ID:1225737

Dai, Y. M. ^[1]; Bowlan, J. ^[1]; Li, H. ^[2]; Miao, H. ^[2]; Wu, S. F. ^[2]; Kong, W. D. ^[2]; Shi, Y. G. ^[2]; Trugman, S. A. ^[1]; Zhu, J. -X. ^[1]; Ding, H. ^[3]; Taylor, A. J. ^[1]; Yarotski, D. A. ^[1]; Prasankumar, R. P. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)

In this study, ultrafast optical pump-probe spectroscopy is used to track carrier dynamics in the large-magnetoresistance material WTe₂. Our experiments reveal a fast relaxation process occurring on a subpicosecond time scale that is caused by electron-phonon thermalization, allowing us to extract the electron-phonon coupling constant. An additional slower relaxation process, occurring on a time scale of ~5–15 ps, is attributed to phonon-assisted electron-hole recombination. As the temperature decreases from 300 K, the time scale governing this process increases due to the reduction of the phonon population. However, below ~50 K, an unusual decrease of the recombination time sets in, most likely due to a change in the electronic structure that has been linked to the large magnetoresistance observed in this material.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396; XDB07020100; 11274367; 11474330

OSTI ID:: 1225737

Alternate ID(s):: OSTI ID: 1223135

Report Number(s):: LA-UR-15-24678; PRBMDO

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 16; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 55 works

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Directly photoexcited Dirac and Weyl fermions in ZrSiS and NbAs Weber, Chris P.; Schoop, Leslie M.; Parkin, Stuart S. P. Applied Physics Letters, Vol. 113, Issue 22 https://doi.org/10.1063/1.5055207	journal	November 2018
Broadband photocarrier dynamics and nonlinear absorption of PLD-grown WTe ₂ semimetal films Gao, Wenbin; Huang, Lei; Xu, Jinlong Applied Physics Letters, Vol. 112, Issue 17 https://doi.org/10.1063/1.5024777	journal	April 2018
Ultrafast electron hole plasma dynamics in chemically pristine and Ag-doped ZnO nanorods Sarkar, Jit; Menon, Shankar G.; Madhumitha, C. Journal of Applied Physics, Vol. 124, Issue 24 https://doi.org/10.1063/1.5058121	journal	December 2018
Photoresponsivity of an all-semimetal heterostructure based on graphene and WTe2 Liu, Yujie; Liu, Chuan; Wang, Xiaomu Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-29717-8	journal	August 2018
Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals Weber, Chris P.; Berggren, Bryan S.; Masten, Madison G. Journal of Applied Physics, Vol. 122, Issue 22 https://doi.org/10.1063/1.5006934	journal	December 2017
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Ultrafast broadband optical spectroscopy for quantifying subpicometric coherent atomic displacements in ${WTe}_{2}$ Soranzio, Davide; Peressi, Maria; Cava, Robert J. Physical Review Research, Vol. 1, Issue 3 https://doi.org/10.1103/physrevresearch.1.032033	journal	December 2019
Dynamics of out-of-equilibrium electron and hole pockets in the type-II Weyl semimetal candidate ${WTe}_{2}$ Caputo, M.; Khalil, L.; Papalazarou, E. Physical Review B, Vol. 97, Issue 11 https://doi.org/10.1103/physrevb.97.115115	journal	March 2018
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PrBi: Topology meets quadrupolar degrees of freedom He, Xiaobo; Zhao, Chuanwen; Yang, Haiyang arXiv https://doi.org/10.48550/arxiv.1909.04446	text	January 2019

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