期刊
NATURE PHOTONICS
卷 13, 期 3, 页码 180-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-019-0348-z
关键词
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资金
- NSF [DMR-1306878, EFMA-1542747]
- NSF MRSEC programme [DMR-1720595]
- Welch Foundation [F-1802, F-1662]
- Air Force Office of Scientific Research (MURI) [FA9550-17-1-0002]
- DARPA Nascent program
- Ministry of Science and Technology (MOST) in Taiwan [MOST 105-2112-M-007-011-MY3]
- NSF CAREER grant [ECCS-1749177]
- NSFC [11774035, 11674032]
Excitons in monolayer transition metal dichalcogenides are formed at K and K' points at the boundary of the Brillouin zone. They acquire a valley degree of freedom, which has been explored as an alternative information carrier, analogous to charge or spin. Two opposite valleys in transition metal dichalcogenides can be optically addressed using light with different helicity. Here, we demonstrate that valley-polarized excitons can be sorted and spatially separated at room temperature by coupling a MoS2 monolayer to a subwavelength asymmetric groove array. In addition to separation of valley excitons in real space, emission from valley excitons is also separated in photon momentum-space; that is, the helicity of photons determines a preferential emission direction. Our work demonstrates that metasurfaces can facilitate valley transport and establish an interface between valleytronic and photonic devices, thus addressing outstanding challenges in the field of valleytronics.
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