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

Cited 0 time in webofscience Cited 0 time in scopus
17 Viewed 2 Downloaded
Title
Experimental Observation of Hidden Berry Curvature in Inversion-Symmetric Bulk 2H-WSe2
Author(s)
Soohyun Cho; Jin-Hong Park; Jisool Hong; Jongkeun Jung; Beom Seo Kim; Garam Han; Wonshik Kyung; Yeongkwan Kim; S.-K. Mo; J.D. Denlinger; Ji Hoon Shim; Jung Hoon Han; Changyoung Kim; Seung Ryong Park
Publication Date
2018-10
Journal
PHYSICAL REVIEW LETTERS, v.121, no.18, pp.186401 -
Publisher
AMER PHYSICAL SOC
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. © 2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5139
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
Experimental Observation of Hidden Berry Curvature in Inversion-Symmetric Bulk 2H-WSe2_PhysRevLett.121.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse