论文标题
量子旋转厅阶段中二维材料中非磁性边缘障碍引起的拓扑保护的崩溃
Breakdown of topological protection due to non-magnetic edge disorder in two-dimensional materials in the Quantum Spin Hall phase
论文作者
论文摘要
我们通过电子相互作用和边缘疾病的综合作用研究了量子自旋系统中电导量化的抑制，这在exfoliated和CVD生长的2D材料中无处不在。我们表明，由于边缘缺陷和电子电子相互作用，电子局部状态之间的相互作用会导致局部磁矩，从而破坏了时间反转的对称性以及对2D拓扑系统中边缘状态的拓扑保护。我们的结果表明，边缘障碍会导致短样品中完美量化电导的小偏差，并导致长时间的电导抑制。我们的分析基于Kane-Mele模型，Kane-Mele模型是一种不受限制的哈伯德野生场，以及一种自洽的递归Green功能，以计算运输量。
We study the suppression of the conductance quantization in quantum spin Hall systems by a combined effect of electronic interactions and edge disorder, that is ubiquitous in exfoliated and CVD grown 2D materials. We show that the interplay between the electronic localized states due to edge defects and electron-electron interactions gives rise to local magnetic moments, that break time-reversal symmetry and the topological protection of the edge states in 2D topological systems. Our results suggest that edge disorder leads to small deviations of a perfect quantized conductance in short samples and to a strong conductance suppression in long ones. Our analysis is based on on the Kane-Mele model, an unrestricted Hubbard mean field Hamiltonian and on a self-consistent recursive Green's functions technique to calculate the transport quantities.
