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

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

doi:10.1103/PhysRevLett.121.186401

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

Journal Article · Mon Oct 29 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.186401· OSTI ID:1571115

Cho, Soohyun ^[1]; Park, Jin-Hong ^[2]; Hong, Jisook ^[3]; Jung, Jongkeun ^[4]; Kim, Beom Seo ^[4]; Han, Garam ^[4]; Kyung, Wonshik ^[5]; Kim, Yeongkwan ^[6]; Mo, S. -K. ^[7]; Denlinger, J. D. ^[7]; Shim, Ji Hoon ^[3]; Han, Jung Hoon ^[8]; Kim, Changyoung ^[4]; Park, Seung Ryong ^[9]

Yonsei Univ., Seoul (Korea, Republic); Inst. for Basic Science (IBS), Seoul (Korea Republic of)
Inst. for Basic Science (IBS), Seoul (Korea Republic of)
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
Inst. for Basic Science (IBS), Seoul (Korea Republic of); Seoul National Univ. (Korea, Republic of)
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)
Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Sungkyunkwan Univ., Suwon (Republic of Korea)
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.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 ); USDOE

Grant/Contract Number:: AC02-05CH11231; IBS-R009-G2

OSTI ID:: 1571115

Alternate ID(s):: OSTI ID: 1479620

Journal Information:: Physical Review Letters, Vol. 121, Issue 18; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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