title: Light-Induced Exciton Spin Hall Effect in van der Waals Heterostructures.
abstract: We propose a light-induced spin Hall effect for interlayer exciton gas in monolayer MoSe2-WSe2 van der Waals heterostructure. By applying two infrared, spatially varying laser beams coupled to the exciton internal states, a spin-dependent gauge potential on the exciton center-of-mass motion is induced. This gauge potential deflects excitons in different spin states towards opposite directions, leading to a finite spin current but vanishing mass current. In the Hall bar geometry, the spin-dependent deflection gives rise to spin-dependent chiral edge states with spin-velocity locking. The spin current and chiral edge states of the excitons can be detected by spatially resolved photoluminescence spectroscopy.
authors.affiliation: SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, China.
authors.forename: Yun-Mei
authors.initials: YM
authors.lastname: Li
authors.affiliation: SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.affiliation: Beijing Computational Science Research Center, Beijing 100094, China.
authors.forename: Li-Kun
authors.initials: LK
authors.lastname: Shi
authors.affiliation: SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Beijing Computational Science Research Center, Beijing 100094, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Yang
authors.affiliation: SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, China.|Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Chang