Elastic quantum spin Hall effect in kagome lattices
Elastic quantum spin Hall effect in kagome lattices
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DOI：
10.1103/physrevb.98.094302
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发表时间：
2018-09-05
影响因子：
3.7
通讯作者：
Huang, G. L.
中科院分区：
文献类型：
--
作者：
Chen, H.;Nassar, H.;Huang, G. L.
量子自旋霍尔绝缘体（QSHI）的机械模拟实现到一个简单的质量弹簧kagome晶格。从平凡态到拓扑态的转变由对比度参数的不变陈数函数描述。采用数值计算和解析相结合的方法，得到了准分子氢的能带图和螺旋边缘态特征。特别是，这些国家被证明是斯通利波解决方案的一组渐近连续运动方程。最后，极化拓扑边缘波在尖角附近的无散射传播被证明，并通过参数研究评估鲁棒性。
A mechanical analog to the quantum spin Hall insulator (QSHI) is implemented into a simple mass-spring kagome lattice. The transition from the trivial state to the topological one is described by an invariant Chern number function of a contrast parameter. The band diagram and helical edge states characteristic of QSHI are obtained by a combination of numerical and analytical methods. In particular, these states are shown to be Stoneley wave solutions to a set of asymptotic continuous motion equations. Last, scatterless propagation of polarized topological edge waves around sharp corners is demonstrated and robustness is assessed through a parametric study.