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Title: Ultrafast carrier dynamics in the large-magnetoresistance material WTe 2

Abstract

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.

Authors:
 [1];  [1];  [2];  [2];  [2];  [2];  [2];  [1];  [1];  [3];  [1];  [1];  [1]
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1225737
Alternate Identifier(s):
OSTI ID: 1223135
Report Number(s):
LA-UR-15-24678
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:  
AC52-06NA25396; XDB07020100; 11274367; 11474330
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 16; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; optical properties; magnetoresistance

Citation Formats

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., and Prasankumar, R. P. Ultrafast carrier dynamics in the large-magnetoresistance material WTe2. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.161104.
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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. Ultrafast carrier dynamics in the large-magnetoresistance material WTe2. United States. https://doi.org/10.1103/PhysRevB.92.161104
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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., and Prasankumar, R. P. Wed . "Ultrafast carrier dynamics in the large-magnetoresistance material WTe2". United States. https://doi.org/10.1103/PhysRevB.92.161104. https://www.osti.gov/servlets/purl/1225737.
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@article{osti_1225737,
title = {Ultrafast carrier dynamics in the large-magnetoresistance material WTe2},
author = {Dai, Y. M. and Bowlan, J. and Li, H. and Miao, H. and Wu, S. F. and Kong, W. D. and Shi, Y. G. and Trugman, S. A. and Zhu, J. -X. and Ding, H. and Taylor, A. J. and Yarotski, D. A. and Prasankumar, R. P.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.92.161104},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 16,
volume = 92,
place = {United States},
year = {Wed Oct 07 00:00:00 EDT 2015},
month = {Wed Oct 07 00:00:00 EDT 2015}
}
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https://doi.org/10.1103/PhysRevB.92.161104
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Drastic Pressure Effect on the Extremely Large Magnetoresistance in WTe 2 : Quantum Oscillation Study
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Ultrafast Pump-Probe Study of Phase Separation and Competing Orders in the Underdoped ( Ba , K ) Fe 2 As 2 Superconductor
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    Works referencing / citing this record:

    Electronic properties of candidate type-II Weyl semimetal WTe 2 . A review perspective
    journal, March 2019

    Temperature-induced inversion of the spin-photogalvanic effect in WTe 2 and MoTe 2
    journal, September 2018

    Directly photoexcited Dirac and Weyl fermions in ZrSiS and NbAs
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    Broadband photocarrier dynamics and nonlinear absorption of PLD-grown WTe 2 semimetal films
    journal, April 2018

    • Gao, Wenbin; Huang, Lei; Xu, Jinlong
    • Applied Physics Letters, Vol. 112, Issue 17
    • DOI: 10.1063/1.5024777

    Ultrafast electron hole plasma dynamics in chemically pristine and Ag-doped ZnO nanorods
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    Photoresponsivity of an all-semimetal heterostructure based on graphene and WTe2
    journal, August 2018

    Similar ultrafast dynamics of several dissimilar Dirac and Weyl semimetals
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    • Journal of Applied Physics, Vol. 122, Issue 22
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    Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal
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    PrBi: Topology meets quadrupolar degrees of freedom
    journal, February 2020

    Ultrafast broadband optical spectroscopy for quantifying subpicometric coherent atomic displacements in WTe 2
    journal, December 2019

    Dynamics of out-of-equilibrium electron and hole pockets in the type-II Weyl semimetal candidate WTe 2
    journal, March 2018

    Coherent optical phonon oscillation and possible electronic softening in WTe2 crystals
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    • He, Bin; Zhang, Chunfeng; Zhu, Weida
    • Scientific Reports, Vol. 6, Issue 1
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    PrBi: Topology meets quadrupolar degrees of freedom
    text, January 2019

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