论文标题
双曲线超材料中2D激子的光谷效果
Optical Valley Hall Effect of 2D Excitons in Hyperbolic Metamaterial
论文作者
论文摘要
二维半导体中电子的稳健旋转和动量谷锁定使山谷具有功能性光电设备的巨大效用自由度。由于不同山谷的光学选择规则的差异，这些山谷电子可以通过光学解决。这些材料中的电子和激子表现出山谷大厅效应，其中特定山谷的载体在电或热偏置下针对不同方向。在这里，我们报告了光谷霍尔的效应，其中单层WS2中谷极化激子的光发射沿不同方向传播，这是由于激励型发射与双曲线材料的高动量状态的优先耦合。实验观察到的效果通过双曲介质近场的激子发射的理论建模来证实。使用庞大的人造光子介质的光谷大厅效应的演示无需纳米结构，就可以实现在室温下运行的基于山谷的激子电路。
The robust spin and momentum valley locking of electrons in two-dimensional semiconductors make the valley degree of freedom of great utility for functional optoelectronic devices. Owing to the difference in optical selection rules for the different valleys, these valley electrons can be addressed optically. The electrons and excitons in these materials exhibit valley Hall effect, where the carriers from specific valleys are directed to different directions under electrical or thermal bias. Here we report the optical valley Hall effect where the light emission from the valley polarized excitons in monolayer WS2 propagates in different directions owing to the preferential coupling of excitonic emission to the high momentum states of the hyperbolic metamaterial. The experimentally observed effects are corroborated with theoretical modeling of excitonic emission in the near field of hyperbolic media. The demonstration of the optical valley Hall effect using a bulk artificial photonic media without the need for nanostructuring opens the possibility of realizing valley-based excitonic circuits operating at room temperature.
