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Title: Interference evidence for Rashba-type spin splitting on a semimetallic WT e 2 surface

Abstract

Here, semimetallic tungsten ditelluride displays an extremely large nonsaturating magnetoresistance, which is thought to arise from the perfect n–p charge compensation with low carrier densities in WTe 2. We find a strong Rashba spin-orbit effect in density functional calculations due to the noncentrosymmetric structure. This lifts twofold spin degeneracy of the bands. A prominent umklapp interference pattern is observed by our scanning tunneling microscopic measurements at 4.2 K, which differs distinctly from the surface atomic structure demonstrated at 77 K. The energy dependence of umklapp interference shows a strong correspondence with densities of states integrated from ARPES measurement, manifesting a fact that the bands are spin-split on the opposite sides of Γ. Spectroscopic survey reveals the electron/hole asymmetry changes alternately with lateral locations along the b axis, providing a microscopic picture for double-carrier transport of semimetallic WTe 2. The conclusion is further supported by our ARPES results and Shubnikov–de Haas (SdH) oscillations measurements.

Authors:
 [1];  [2];  [1];  [3];  [1];  [4];  [5];  [6];  [7];  [8];  [4];  [1];  [9];  [5]
  1. Soochow Univ., Jiangsu (People's Republic of China)
  2. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Tsinghua Univ., Beijing (China)
  4. Tsinghua Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  5. Huazhong Univ. of Science and Technology, Wuhan (China)
  6. Peking Univ., Beijing (China)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Tsinghua Univ., Beijing (China)
  8. Collaborative Innovation Center of Quantum Matter, Beijing (China); Peking Univ., Beijing (China)
  9. Univ. of Missouri, Columbia, MO (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1376476
Alternate Identifier(s):
OSTI ID: 1324370
Grant/Contract Number:  
AC05-00OR22725; SC0014607
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 11; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Li, Qing, Yan, Jiaqiang, Yang, Biao, Zang, Yunyi, Zhang, Junjie, He, Ke, Wu, Menghao, Zhao, Yanfei, Mandrus, David, Wang, Jian, Xue, Qikun, Chi, Lifeng, Singh, David J., and Pan, Minghu. Interference evidence for Rashba-type spin splitting on a semimetallic WTe2 surface. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.115419.
Li, Qing, Yan, Jiaqiang, Yang, Biao, Zang, Yunyi, Zhang, Junjie, He, Ke, Wu, Menghao, Zhao, Yanfei, Mandrus, David, Wang, Jian, Xue, Qikun, Chi, Lifeng, Singh, David J., & Pan, Minghu. Interference evidence for Rashba-type spin splitting on a semimetallic WTe2 surface. United States. doi:10.1103/PhysRevB.94.115419.
Li, Qing, Yan, Jiaqiang, Yang, Biao, Zang, Yunyi, Zhang, Junjie, He, Ke, Wu, Menghao, Zhao, Yanfei, Mandrus, David, Wang, Jian, Xue, Qikun, Chi, Lifeng, Singh, David J., and Pan, Minghu. Tue . "Interference evidence for Rashba-type spin splitting on a semimetallic WTe2 surface". United States. doi:10.1103/PhysRevB.94.115419. https://www.osti.gov/servlets/purl/1376476.
@article{osti_1376476,
title = {Interference evidence for Rashba-type spin splitting on a semimetallic WTe2 surface},
author = {Li, Qing and Yan, Jiaqiang and Yang, Biao and Zang, Yunyi and Zhang, Junjie and He, Ke and Wu, Menghao and Zhao, Yanfei and Mandrus, David and Wang, Jian and Xue, Qikun and Chi, Lifeng and Singh, David J. and Pan, Minghu},
abstractNote = {Here, semimetallic tungsten ditelluride displays an extremely large nonsaturating magnetoresistance, which is thought to arise from the perfect n–p charge compensation with low carrier densities in WTe2. We find a strong Rashba spin-orbit effect in density functional calculations due to the noncentrosymmetric structure. This lifts twofold spin degeneracy of the bands. A prominent umklapp interference pattern is observed by our scanning tunneling microscopic measurements at 4.2 K, which differs distinctly from the surface atomic structure demonstrated at 77 K. The energy dependence of umklapp interference shows a strong correspondence with densities of states integrated from ARPES measurement, manifesting a fact that the bands are spin-split on the opposite sides of Γ. Spectroscopic survey reveals the electron/hole asymmetry changes alternately with lateral locations along the b axis, providing a microscopic picture for double-carrier transport of semimetallic WTe2. The conclusion is further supported by our ARPES results and Shubnikov–de Haas (SdH) oscillations measurements.},
doi = {10.1103/PhysRevB.94.115419},
journal = {Physical Review B},
number = 11,
volume = 94,
place = {United States},
year = {Tue Sep 13 00:00:00 EDT 2016},
month = {Tue Sep 13 00:00:00 EDT 2016}
}

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