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Optically Reconfigurable Spin-Valley Hall Effect of Light in Coupled Nonlinear Ring Resonator Lattice
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-07-23 , DOI: 10.1103/physrevlett.127.043904 Haofan Yang 1 , Jing Xu 1, 2 , Zhongfei Xiong 1 , Xinda Lu 1 , Ruo-Yang Zhang 3 , Hanghang Li 1 , Yuntian Chen 1, 2 , Shuang Zhang 4, 5
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-07-23 , DOI: 10.1103/physrevlett.127.043904 Haofan Yang 1 , Jing Xu 1, 2 , Zhongfei Xiong 1 , Xinda Lu 1 , Ruo-Yang Zhang 3 , Hanghang Li 1 , Yuntian Chen 1, 2 , Shuang Zhang 4, 5
Affiliation
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Scattering immune propagation of light in topological photonic systems may revolutionize the design of integrated photonic circuits for information processing and communications. In optics, various photonic topological circuits have been developed, which were based on classical emulation of either quantum spin Hall effect or quantum valley Hall effect. On the other hand, the combination of both the valley and spin degrees of freedom can lead to a new kind of topological transport phenomenon, dubbed spin-valley Hall effect (SVHE), which can further expand the number of topologically protected edge channels and would be useful for information multiplexing. However, it is challenging to realize SVHE in most known material platforms, due to the requirement of breaking both the (pseudo)fermionic time-reversal () and parity symmetries () individually, but leaving the combined symmetry intact. Here, we propose an experimentally feasible platform to realize SVHE for light, based on coupled ring resonators mediated by optical Kerr nonlinearity. Thanks to the inherent flexibility of cross-mode modulation, the coupling between the probe light can be engineered in a controllable way such that spin-dependent staggered sublattice potential emerges in the effective Hamiltonian. With delicate yet experimentally feasible pump conditions, we show the existence of spin-valley Hall-induced topological edge states. We further demonstrate that both degrees of freedom, i.e., spin and valley, can be manipulated simultaneously in a reconfigurable manner to realize spin-valley photonics, doubling the degrees of freedom for enhancing the information capacity in optical communication systems.
中文翻译：
耦合非线性环形谐振腔晶格中光的光学可重构自旋谷霍尔效应
拓扑光子系统中光的散射免疫传播可能会彻底改变用于信息处理和通信的集成光子电路的设计。在光学方面，已经开发了各种光子拓扑电路，它们基于量子自旋霍尔效应或量子谷霍尔效应的经典仿真。另一方面，谷和自旋自由度的结合会导致一种新的拓扑传输现象，称为自旋谷霍尔效应（SVHE），它可以进一步扩大拓扑保护边缘通道的数量，并对信息复用很有用。然而，由于需要打破（伪）费米子时间反转（) 和奇偶对称性 () 单独，但保留组合对称性 完整。在这里，我们提出了一个实验可行的平台来实现光的 SVHE，基于由光学克尔非线性介导的耦合环形谐振器。由于交叉模式调制的固有灵活性，可以以可控方式设计探测光之间的耦合，从而在有效哈密顿量中出现与自旋相关的交错亚晶格势。在微妙但实验上可行的泵条件下，我们展示了自旋谷霍尔诱导拓扑边缘状态的存在。我们进一步证明，可以以可重构的方式同时操纵两个自由度，即自旋和谷，以实现自旋谷光子学，将自由度加倍以提高光通信系统中的信息容量。
更新日期：2021-07-23
中文翻译：
耦合非线性环形谐振腔晶格中光的光学可重构自旋谷霍尔效应
拓扑光子系统中光的散射免疫传播可能会彻底改变用于信息处理和通信的集成光子电路的设计。在光学方面，已经开发了各种光子拓扑电路，它们基于量子自旋霍尔效应或量子谷霍尔效应的经典仿真。另一方面，谷和自旋自由度的结合会导致一种新的拓扑传输现象，称为自旋谷霍尔效应（SVHE），它可以进一步扩大拓扑保护边缘通道的数量，并对信息复用很有用。然而，由于需要打破（伪）费米子时间反转（) 和奇偶对称性 () 单独，但保留组合对称性 完整。在这里，我们提出了一个实验可行的平台来实现光的 SVHE，基于由光学克尔非线性介导的耦合环形谐振器。由于交叉模式调制的固有灵活性，可以以可控方式设计探测光之间的耦合，从而在有效哈密顿量中出现与自旋相关的交错亚晶格势。在微妙但实验上可行的泵条件下，我们展示了自旋谷霍尔诱导拓扑边缘状态的存在。我们进一步证明，可以以可重构的方式同时操纵两个自由度，即自旋和谷，以实现自旋谷光子学，将自由度加倍以提高光通信系统中的信息容量。
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