2021年第82回応用物理学会秋季学術講演会

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CS コードシェアセッション » 【CS.8】 4.5 Nanocarbon and 2D Materials、17 ナノカーボンのコードシェアセッション

[10a-N305-1~10] CS.8 4.5 Nanocarbon and 2D Materials、17 ナノカーボンのコードシェアセッション

2021年9月10日(金) 09:00 〜 12:15 N305 (口頭)

松田 一成(京大)

09:30 〜 09:45

[10a-N305-2] Bulk photovoltaic effect in WSe2/Black Phosphorus interfaces

Toshiya Ideue1、Takatoshi Akamatsu1、Zhou Ling2、Yu Dong1、Sota Kitamura1、Mao Yoshii1、Dongyang Yang3、Masaru Onga1、Yuji Nakagawa1、Kenji Watanabe4、Takashi Taniguchi4、Joseph Laurienzo5、Junwei Huang2、Ziliang Ye3、Takahiro Morimoto1、Hongtao Yuan2、Yoshihiro Iwasa1,6 (1.The Univ. of Tokyo、2.Nanjing Univ.、3.The Univ. of British Columbia、4.NIMS、5.Case Western Reserve Univ.、6.RIKEN CEMS)

キーワード:van der Waals heterointerface, bulk photovoltaic effect, shift current

We studied the van der Waals interface composed of two-dimensional crystals with different symmetries (three-fold rotational WSe2 and two-fold rotational black phosphorus (BP)). Because three-fold rotational symmetry and two-fold rotational symmetry cannot be compatible, interface of WSe2 and BP has no rotational symmetry and only one mirror plane exists if the mirror planes of both WSe2 and BP are parallel. As a result, in-plane electronic polarization can emerge, which cause the bulk photovoltaic effect along the polar direction. The observed photocurrent responses can be well explained by a quantum-mechanical shift current. The present results offer a simple guideline for symmetry engineering applicable to a variety of van der Waals nanostructures and also provide the concept of electronic polarization in quasi-periodic systems.