纳米光子学
光子学
光电子学
二硒化钨
材料科学
异质结
激子
手性(物理)
单层
半导体
纳米技术
物理
凝聚态物理
量子力学
化学
催化作用
过渡金属
生物化学
手征对称破缺
Nambu–Jona Lasinio模型
夸克
作者
Robert Shreiner,Kai Hao,Amy Butcher,Alexander A. High
出处
期刊:Nature Photonics
[Springer Nature]
日期:2022-03-17
卷期号:16 (4): 330-336
被引量:20
标识
DOI:10.1038/s41566-022-00971-7
摘要
Chiral nanophotonic interfaces enable propagation direction-dependent interactions between guided optical modes and circularly dichroic materials. Electrical tuning of interface chirality would aid active, switchable non-reciprocity in on-chip optoelectronic and photonic circuitry, but remains an outstanding challenge. Here, we report electrically controllable chirality in a nanophotonic interface with atomically thin monolayer tungsten diselenide (WSe2). Titanium dioxide waveguides are directly fabricated on the surface of low-disorder, boron nitride-encapsulated WSe2. Following integration, photoluminescence from excitonic states into the waveguide can be electrically switched between balanced and directionally biased emission. The operational principle leverages the doping-dependent valley polarization of excitonic states in WSe2. Furthermore, the nanophotonic waveguide can function as a near-field source for diffusive exciton fluxes, which display valley and spin polarizations that are inherited from the interface chirality. Our versatile fabrication approach enables the deterministic integration of photonics with van der Waals heterostructures and could provide optical control over their excitonic and charge-carrier behaviour. Researchers demonstrate electrically controllable chirality by exploiting doping-dependent valley polarization of excitonic states in monolayer tungsten diselenide.
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