Pseudo-spin-valley coupled edge states in a photonic topological insulator.
Pseudo-spin-valley coupled edge states in a photonic topological insulator.
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DOI：
10.1038/s41467-018-05408-w
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发表时间：
2018-08-02
影响因子：
16.6
通讯作者：
Genack AZ
中科院分区：
文献类型：
--
作者：
Kang Y;Ni X;Cheng X;Khanikaev AB;Genack AZ
在拓扑绝缘体的光子类似物中设计的伪自旋和谷自由度为光学编码和鲁棒信号传输提供了潜在的方法。在这里，我们观察到一个弹道边缘状态，其自旋谷指数被锁定到沿沿着谷光子晶体和模拟量子自旋霍尔效应的亚晶之间的界面的传播方向。我们证明了抑制谷间散射的Y结形成在携带不同的自旋谷陈数的光子拓扑绝缘体之间的接口。这些结果开辟了使用谷自由度来控制2D结构中的光信号流的可能性。光子带结构中的谷为设计拓扑光子结构和器件提供了额外的自由度。在这里，Kang等人证明了谷间散射在具有不同谷拓扑的三个部分之间的Y形结处被抑制。
Pseudo-spin and valley degrees of freedom engineered in photonic analogues of topological insulators provide potential approaches to optical encoding and robust signal transport. Here we observe a ballistic edge state whose spin–valley indices are locked to the direction of propagation along the interface between a valley photonic crystal and a metacrystal emulating the quantum spin–Hall effect. We demonstrate the inhibition of inter-valley scattering at a Y-junction formed at the interfaces between photonic topological insulators carrying different spin–valley Chern numbers. These results open up the possibility of using the valley degree of freedom to control the flow of optical signals in 2D structures. Valleys in the photonic band structure provide an additional degree of freedom to engineer topological photonic structures and devices. Here, Kang et al. demonstrate that inter-valley scattering is inhibited at a Y-junction between three sections with different valley topology.
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影响因子：
56.9
作者：
Bernevig, B. Andrei;Hughes, Taylor L.;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
64.8
作者：
Ju, Long;Shi, Zhiwen;Wang, Feng
通讯作者：
Wang, Feng
影响因子：
3.3
作者：
Malterre, D.;Kierren, B.;Ortega, J. E.
通讯作者：
Ortega, J. E.
用于控制自旋和拓扑的谷光子晶体
影响因子：
41.2
作者：
Dong, Jian-Wen;Chen, Xiao-Dong;Zhang, Xiang
通讯作者：
Zhang, Xiang
影响因子：
8.6
作者：
Ma, Tzuhsuan;Khanikaev, Alexander B.;Shvets, Gennady
通讯作者：
Shvets, Gennady