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arXiv 1703.03421cond-mat.mes-hall
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二维拓扑绝缘体边缘态的核自旋诱导局域化

Nuclear-spin-induced localization of the edge states in two-dimensional topological insulators

Chen-Hsuan Hsu, Peter Stano, Jelena Klinovaja, Daniel Loss

摘要:

研究了核自旋对二维拓扑绝缘体(2DTI)螺旋边缘态电阻的影响。通过超精细相互作用,核自旋允许电子反向散射,否则被时间反演对称性禁止。我们确定了两个后向散射机制,这取决于核自旋是否有序。它们的温度依赖性是不同的,但都给电阻,这增加了与边长,降低温度,并增加强度的电子-电子相互作用。总的来说,我们发现核自旋通常会在零温度下关闭2DTI边缘的电导。

英文摘要:

We investigate the influence of nuclear spins on the resistance of helical edge states of two-dimensional topological insulators (2DTIs). Via the hyperfine interaction, nuclear spins allow electron backscattering, otherwise forbidden by time reversal symmetry. We identify two backscattering mechanisms, depending on whether the nuclear spins are ordered or not. Their temperature dependence is distinct but both give resistance, which increases with the edge length, decreasing temperature, and increasing strength of the electron-electron interaction. Overall, we find that the nuclear spins will typically shut down the conductance of the 2DTI edges at zero temperature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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