Spatially indirect intervalley excitons in bilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">W</mml:mi><mml:msub><mml:mi>Se</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
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
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.