Higher-Order Topological Spin Hall Effect of Sound
Higher-Order Topological Spin Hall Effect of Sound
复制标题
声音的高阶拓扑自旋霍尔效应
DOI:
10.1088/0256-307x/37/7/074302
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发表时间:
2020-05
影响因子:
3.5
通讯作者:
Jiang Jian-Hua
中科院分区:
文献类型:
--
作者:
Lin Zhi-Kang;Wu Shi-Qiao;Wang Hai-Xiao;Jiang Jian-Hua
We propose theoretically a reconfigurable two-dimensional (2D) hexagonal sonic crystal with higher-order topology protected by the six-fold, $C_6$, rotation symmetry. The acoustic band gap and band topology can be controlled by rotating the triangular scatterers in each unit-cell. In the nontrivial phase, the sonic crystal realizes the topological spin Hall effect in a higher-order fashion: (i) The edge states emerging in the bulk band gap exhibits partial spin-momentum locking and are gapped due to the reduced spatial symmetry at the edges. (ii) The gapped edge states, on the other hand, stabilize the topological corner states emerging in the edge band gap. The partial spin-momentum locking is manifested as pseudo-spin-polarization of edge states away from the time-reversal invariant momenta, where the pseudospin is emulated by the acoustic orbital angular momentum. We reveal the underlying topological mechanism using a corner topological index based on the symmetry representation of the acoustic Bloch bands.
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影响因子:
1
作者:
Wang Jian;Wu Shi-Qiao;Mei Jun
通讯作者:
Mei Jun
影响因子:
16.6
作者:
Gorlach MA;Ni X;Smirnova DA;Korobkin D;Zhirihin D;Slobozhanyuk AP;Belov PA;Alù A;Khanikaev AB
通讯作者:
Khanikaev AB
影响因子:
3.7
作者:
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通讯作者:
Guido van Miert;C. Ortix
影响因子:
8.6
作者:
Langbehn, Josias;Peng, Yang;Brouwer, Piet W.
通讯作者:
Brouwer, Piet W.
影响因子:
3.7
作者:
Zhan Xiong;Zhi-Kang Lin;Hai-Xiao Wang;Xiujuan Zhang;Ming-Hui Lu;Yan-Feng Chen;Jian‐Hua Jiang
通讯作者:
Zhan Xiong;Zhi-Kang Lin;Hai-Xiao Wang;Xiujuan Zhang;Ming-Hui Lu;Yan-Feng Chen;Jian‐Hua Jiang