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Title: Experimental Observation of Hidden Berry Curvature in Inversion-Symmetric Bulk 2 H - WSe 2

Abstract

We investigate the hidden Berry curvature in bulk 2H-WSe2 by utilizing the surface sensitivity of angle resolved photoemission (ARPES). The symmetry in the electronic structure of transition metal dichalcogenides is used to uniquely determine the local orbital angular momentum (OAM) contribution to the circular dichroism (CD) in ARPES. The extracted CD signals for the K and K′ valleys are almost identical, but their signs, which should be determined by the valley index, are opposite. In addition, the sign is found to be the same for the two spin-split bands, indicating that it is independent of spin state. These observed CD behaviors are what are expected from Berry curvature of a monolayer of WSe2. In order to see if CD-ARPES is indeed representative of hidden Berry curvature within a layer, we use tight binding analysis as well as density functional calculation to calculate the Berry curvature and local OAM of a monolayer WSe2. We find that measured CD-ARPES is approximately proportional to the calculated Berry curvature as well as local OAM, further supporting our interpretation.

Authors:
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [6];  [7];  [7];  [3];  [8];  [4];  [9]
  1. Yonsei Univ., Seoul (Korea, Republic); Inst. for Basic Science (IBS), Seoul (Korea Republic of)
  2. Inst. for Basic Science (IBS), Seoul (Korea Republic of)
  3. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  4. Inst. for Basic Science (IBS), Seoul (Korea Republic of); Seoul National Univ. (Korea, Republic of)
  5. Inst. for Basic Science (IBS), Seoul (Korea Republic of); Seoul National Univ. (Korea, Republic of); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  6. Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  8. Sungkyunkwan Univ., Suwon (Republic of Korea)
  9. Incheon National Univ. (Korea, Republic of)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 ); USDOE
OSTI Identifier:
1571115
Alternate Identifier(s):
OSTI ID: 1479620
Grant/Contract Number:  
AC02-05CH11231; IBS-R009-G2
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 18; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Cho, Soohyun, Park, Jin-Hong, Hong, Jisook, Jung, Jongkeun, Kim, Beom Seo, Han, Garam, Kyung, Wonshik, Kim, Yeongkwan, Mo, S. -K., Denlinger, J. D., Shim, Ji Hoon, Han, Jung Hoon, Kim, Changyoung, and Park, Seung Ryong. Experimental Observation of Hidden Berry Curvature in Inversion-Symmetric Bulk 2H-WSe2. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.186401.
Cho, Soohyun, Park, Jin-Hong, Hong, Jisook, Jung, Jongkeun, Kim, Beom Seo, Han, Garam, Kyung, Wonshik, Kim, Yeongkwan, Mo, S. -K., Denlinger, J. D., Shim, Ji Hoon, Han, Jung Hoon, Kim, Changyoung, & Park, Seung Ryong. Experimental Observation of Hidden Berry Curvature in Inversion-Symmetric Bulk 2H-WSe2. United States. doi:10.1103/PhysRevLett.121.186401.
Cho, Soohyun, Park, Jin-Hong, Hong, Jisook, Jung, Jongkeun, Kim, Beom Seo, Han, Garam, Kyung, Wonshik, Kim, Yeongkwan, Mo, S. -K., Denlinger, J. D., Shim, Ji Hoon, Han, Jung Hoon, Kim, Changyoung, and Park, Seung Ryong. Mon . "Experimental Observation of Hidden Berry Curvature in Inversion-Symmetric Bulk 2H-WSe2". United States. doi:10.1103/PhysRevLett.121.186401. https://www.osti.gov/servlets/purl/1571115.
@article{osti_1571115,
title = {Experimental Observation of Hidden Berry Curvature in Inversion-Symmetric Bulk 2H-WSe2},
author = {Cho, Soohyun and Park, Jin-Hong and Hong, Jisook and Jung, Jongkeun and Kim, Beom Seo and Han, Garam and Kyung, Wonshik and Kim, Yeongkwan and Mo, S. -K. and Denlinger, J. D. and Shim, Ji Hoon and Han, Jung Hoon and Kim, Changyoung and Park, Seung Ryong},
abstractNote = {We investigate the hidden Berry curvature in bulk 2H-WSe2 by utilizing the surface sensitivity of angle resolved photoemission (ARPES). The symmetry in the electronic structure of transition metal dichalcogenides is used to uniquely determine the local orbital angular momentum (OAM) contribution to the circular dichroism (CD) in ARPES. The extracted CD signals for the K and K′ valleys are almost identical, but their signs, which should be determined by the valley index, are opposite. In addition, the sign is found to be the same for the two spin-split bands, indicating that it is independent of spin state. These observed CD behaviors are what are expected from Berry curvature of a monolayer of WSe2. In order to see if CD-ARPES is indeed representative of hidden Berry curvature within a layer, we use tight binding analysis as well as density functional calculation to calculate the Berry curvature and local OAM of a monolayer WSe2. We find that measured CD-ARPES is approximately proportional to the calculated Berry curvature as well as local OAM, further supporting our interpretation.},
doi = {10.1103/PhysRevLett.121.186401},
journal = {Physical Review Letters},
number = 18,
volume = 121,
place = {United States},
year = {2018},
month = {10}
}

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