journal article·2022-01-20

Spatially indirect intervalley excitons in bilayer WSe2

Zhiheng Huang, Yanchong Zhao, Tao Bo, Yanbang Chu, Jinpeng Tian, Le Liu, Yalong Yuan, Fanfan Wu, Jiaojiao Zhao, Lede Xian, Kenji Watanabe, Takashi Taniguchi, Rong Yang, Dongxia Shi, Luojun Du, Zhipei Sun, Sheng Meng, Wei Yang, Guangyu Zhang

Physical Review B· Volume 105· Issue 4
Publisher page

Abstract

Spatially indirect intervalley excitons, with electrons and holes separate in both real and momentum space, represent an advantageous scenario for numerous theoretical and experimental advances. The authors demonstrate three types of spatially indirect intervalley excitons and their quantum confined Stark effects in bilayer WSe${}2$. Their energy order and dominant luminescence can be switched by electric fields because of different dipole moments. Remarkably, these spatially indirect intervalley excitons exhibit highly tunable negative circular polarization, providing new ways to exploit valley physics.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Molecular Junctions and Nanostructures

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing National Laboratory for Condensed Matter Physics; Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China

Songshan Lake Materials Laboratory, Dongguan, Guangdong Province 523808, China

Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China

Department of Electronics and Nanoengineering, Aalto University, Tietotie 3, FI-02150 Espoo, Finland

Quantum Technology Finland (QTF) Centre of Excellence, Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland

Funding

National Basic Research Program of China · National Natural Science Foundation of China · Chinese Academy of Sciences · Guangdong Provincial Applied Science and Technology Research and Development Program · Academy of Finland · Horizon 2020 · European Research Council · Ministry of Education, Culture, Sports, Science and Technology · Japan Society for the Promotion of Science · Core Research for Evolutional Science and Technology

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