Studying local Berry curvature in 2H-WSe2 by circular dichroism photoemission utilizing crystal mirror plane

Abstract It was recently reported that circular dichroism in angle-resolved photoemission spectroscopy (CD-ARPES) can be used to observe the Berry curvature in 2H-WSe2 (Cho et al. in Phys Rev Lett 121:186401, 2018). In that study, the mirror plane of the experiment was intentionally set to be perpen...

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Autores principales:	Soohyun Cho, Jin-Hong Park, Soonsang Huh, Jisook Hong, Wonshik Kyung, Byeong-Gyu Park, J. D. Denlinger, Ji Hoon Shim, Changyoung Kim, Seung Ryong Park
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d64ba4f88878439a9b58b67847bd5a39
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spelling	oai:doaj.org-article:d64ba4f88878439a9b58b67847bd5a392021-12-02T10:49:10ZStudying local Berry curvature in 2H-WSe2 by circular dichroism photoemission utilizing crystal mirror plane10.1038/s41598-020-79672-62045-2322https://doaj.org/article/d64ba4f88878439a9b58b67847bd5a392021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79672-6https://doaj.org/toc/2045-2322Abstract It was recently reported that circular dichroism in angle-resolved photoemission spectroscopy (CD-ARPES) can be used to observe the Berry curvature in 2H-WSe2 (Cho et al. in Phys Rev Lett 121:186401, 2018). In that study, the mirror plane of the experiment was intentionally set to be perpendicular to the crystal mirror plane, such that the Berry curvature becomes a symmetric function about the experimental mirror plane. In the present study, we performed CD-ARPES on 2H-WSe2 with the crystal mirror plane taken as the experimental mirror plane. Within such an experimental constraint, two experimental geometries are possible for CD-ARPES. The Berry curvature distributions for the two geometries are expected to be antisymmetric about the experimental mirror plane and exactly opposite to each other. Our experimental CD intensities taken with the two geometries were found to be almost opposite near the corners of the 2D projected hexagonal Brillouin zone (BZ) and were almost identical near the center of the BZ. This observation is well explained by taking the Berry curvature or the atomic orbital angular momentum (OAM) into account. The Berry curvature (or OAM) contribution to the CD intensities can be successfully extracted through a comparison of the CD-ARPES data for the two experimental geometries. Thus, the CD-ARPES experimental procedure described provides a method for mapping Berry curvature in the momentum space of topological materials, such as Weyl semimetals.Soohyun ChoJin-Hong ParkSoonsang HuhJisook HongWonshik KyungByeong-Gyu ParkJ. D. DenlingerJi Hoon ShimChangyoung KimSeung Ryong ParkNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Soohyun Cho Jin-Hong Park Soonsang Huh Jisook Hong Wonshik Kyung Byeong-Gyu Park J. D. Denlinger Ji Hoon Shim Changyoung Kim Seung Ryong Park Studying local Berry curvature in 2H-WSe2 by circular dichroism photoemission utilizing crystal mirror plane
description	Abstract It was recently reported that circular dichroism in angle-resolved photoemission spectroscopy (CD-ARPES) can be used to observe the Berry curvature in 2H-WSe2 (Cho et al. in Phys Rev Lett 121:186401, 2018). In that study, the mirror plane of the experiment was intentionally set to be perpendicular to the crystal mirror plane, such that the Berry curvature becomes a symmetric function about the experimental mirror plane. In the present study, we performed CD-ARPES on 2H-WSe2 with the crystal mirror plane taken as the experimental mirror plane. Within such an experimental constraint, two experimental geometries are possible for CD-ARPES. The Berry curvature distributions for the two geometries are expected to be antisymmetric about the experimental mirror plane and exactly opposite to each other. Our experimental CD intensities taken with the two geometries were found to be almost opposite near the corners of the 2D projected hexagonal Brillouin zone (BZ) and were almost identical near the center of the BZ. This observation is well explained by taking the Berry curvature or the atomic orbital angular momentum (OAM) into account. The Berry curvature (or OAM) contribution to the CD intensities can be successfully extracted through a comparison of the CD-ARPES data for the two experimental geometries. Thus, the CD-ARPES experimental procedure described provides a method for mapping Berry curvature in the momentum space of topological materials, such as Weyl semimetals.
format	article
author	Soohyun Cho Jin-Hong Park Soonsang Huh Jisook Hong Wonshik Kyung Byeong-Gyu Park J. D. Denlinger Ji Hoon Shim Changyoung Kim Seung Ryong Park
author_facet	Soohyun Cho Jin-Hong Park Soonsang Huh Jisook Hong Wonshik Kyung Byeong-Gyu Park J. D. Denlinger Ji Hoon Shim Changyoung Kim Seung Ryong Park
author_sort	Soohyun Cho
title	Studying local Berry curvature in 2H-WSe2 by circular dichroism photoemission utilizing crystal mirror plane
title_short	Studying local Berry curvature in 2H-WSe2 by circular dichroism photoemission utilizing crystal mirror plane
title_full	Studying local Berry curvature in 2H-WSe2 by circular dichroism photoemission utilizing crystal mirror plane
title_fullStr	Studying local Berry curvature in 2H-WSe2 by circular dichroism photoemission utilizing crystal mirror plane
title_full_unstemmed	Studying local Berry curvature in 2H-WSe2 by circular dichroism photoemission utilizing crystal mirror plane
title_sort	studying local berry curvature in 2h-wse2 by circular dichroism photoemission utilizing crystal mirror plane
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d64ba4f88878439a9b58b67847bd5a39
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Studying local Berry curvature in 2H-WSe2 by circular dichroism photoemission utilizing crystal mirror plane

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