Exciton Hall effect in monolayer MoS2

被引:1
|
作者
Onga, Masaru [1 ,2 ]
Zhang, Yijin [3 ,4 ]
Ideue, Toshiya [1 ,2 ]
Iwasa, Yoshihiro [1 ,2 ,5 ]
机构
[1] Univ Tokyo, QPEC, Tokyo 1138656, Japan
[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[3] Osaka Univ, Inst Sci & Ind Res, Osaka 0670047, Japan
[4] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[5] RIKEN, CEMS, Wako, Saitama 3510198, Japan
基金
日本学术振兴会;
关键词
VALLEY POLARIZATION; ABSORPTION; LAYER;
D O I
10.1038/NMAT4996
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The spontaneous Hall effect driven by the quantum Berry phase (which serves as an internal magnetic flux in momentum space) manifests the topological nature of quasiparticles and can be used to control the information flow, such as spin and valley(1,2). We report a Hall effect of excitons (fundamental composite particles of electrons and holes that dominate optical responses in semiconductors(3)). By polarization-resolved photoluminescence mapping, we directly observed the Hall effect of excitons in monolayer MoS2 and valley-selective spatial transport of excitons on a micrometre scale. The Hall angle of excitons is found to be much larger than that of single electrons in monolayer MoS2 (ref. 4), implying that the quantum transport of the composite particles is significantly affectedby their internal structures. Thepresent result not only poses a fundamental problem of the Hall effect in composite particles, but also offers a route to explore exciton-based valleytronics in two-dimensional materials.
引用
收藏
页码:1193 / +
页数:6
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