Title: Experimental Observation of Hidden Berry Curvature in Inversion-Symmetric Bulk 2H- WSe2

Journal Article · · Physical Review Letters
 [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)

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 )
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1571115
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 121; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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