Quantum percolation in quantum spin Hall antidot systems
Quantum percolation in quantum spin Hall antidot systems
复制标题
DOI：
10.1209/0295-5075/100/17013
复制
发表时间：
2012-02
期刊：
影响因子：
--
通讯作者：
Rui-Lin Chu;Jie Lu;S. Shen
中科院分区：
文献类型：
--
作者：
Rui-Lin Chu;Jie Lu;S. Shen
本文研究了反点诱导束缚态对二维量子自旋霍尔绝缘体输运性质的影响。束缚态被发现能够诱导量子渗流在原来的绝缘体。在某些临界反点密度下，量子自旋霍尔相可以由于最大量子逾渗而被完全破坏。对于具有周期性边界的系统，束缚态之间的最大量子渗透在最初带隙和绝缘的体中产生中间扩展态。在量子霍尔效应中，解毒剂诱导的束缚态起着与磁场相同的作用，都使电子进入回旋运动。我们还将该系统中的量子逾渗现象与量子霍尔效应网络模型中的量子逾渗现象进行了类比。
We study the influences of antidot-induced bound states on transport properties of two-dimensional quantum spin Hall insulators. The bound states are found able to induce quantum percolation in the originally insulating bulk. At some critical antidot densities, the quantum spin Hall phase can be completely destroyed due to the maximum quantum percolation. For systems with periodic boundaries, the maximum quantum percolation between the bound states creates intermediate extended states in the bulk which is originally gapped and insulating. The antidot-induced bound states plays the same role as the magnetic field in the quantum Hall effect, both makes electrons go into cyclotron motions. We also draw an analogy between the quantum percolation phenomena in this system and that in the network models of quantum Hall effect.