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arXiv 2101.09437cond-mat.mes-hallcond-mat.other
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边相关量子赝自旋霍尔效应的实验观察

Experimental observation of edge-dependent quantum pseudospin Hall effect

Huanhuan Yang, Lingling Song, Yunshan Cao, X. R. Wang, Peng Yan

摘要:

量子自旋霍尔(QSH)绝缘体的螺旋边态由于时间反演对称性的拓扑保护而特别稳定,这是一个传统的观点。在这里,我们报告的第一个实验观察到的边缘依赖的量子(伪)自旋霍尔效应采用两个凯库勒电路与分子锯齿形和部分胡子的边缘,其中的手性的循环电流在单位电池模仿电子自旋。我们观察到螺旋翻转的拓扑间隙模式出现在相反的参数区域的两个边缘的几何形状。实验结果被解释在单位单元中定义的镜像绕组数,其中的选择完全取决于边缘形状。我们的工作加深了对边界效应对QSH相的理解,并为研究电路中自旋相关的拓扑物理铺平了道路。

英文摘要:

It is a conventional wisdom that the helical edge states of quantum spin Hall (QSH) insulator are particularly stable due to the topological protection of time-reversal symmetry. Here, we report the first experimental observation of an edge-dependent quantum (pseudo-)spin Hall effect by employing two Kekule electric circuits with molecule-zigzag and partially-bearded edges, where the chirality of the circulating current in the unit cell mimics the electron spin. We observe a helicity flipping of the topological in-gap modes emerging in opposite parameter regions for the two edge geometries. Experimental findings are interpreted in terms of the mirror winding number defined in the unit cell, the choice of which exclusively depends on the edge shape. Our work offers a deeper understanding of the boundary effect on the QSH phase, and pave the way for studying the spin-dependent topological physics in electric circuits.

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