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

In this study, ultrafast optical pump-probe spectroscopy is used to track carrier dynamics in the large-magnetoresistance material WTe 2. 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]
  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:
Report Number(s):
LA-UR-15-24678
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:
AC52-06NA25396; XDB07020100; 11274367; 11474330
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)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; optical properties; magnetoresistance
OSTI Identifier:
1225737
Alternate Identifier(s):
OSTI ID: 1223135

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., Web. doi:10.1103/PhysRevB.92.161104.
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. doi:10.1103/PhysRevB.92.161104.
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.. 2015. "Ultrafast carrier dynamics in the large-magnetoresistance material WTe2". United States. doi:10.1103/PhysRevB.92.161104. https://www.osti.gov/servlets/purl/1225737.
@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 = {2015},
month = {10}
}