论文标题
与非磁杂质的库仑相互作用的量子旋转大厅边缘模式的弹性反向散射
Elastic backscattering of quantum spin Hall edge modes from Coulomb interactions with non-magnetic impurities
论文作者
论文摘要
我们证明，量子旋转绝缘子边缘的螺旋电子之间的静电相互作用，动态杂质可以诱导准弹性反向散射。将杂质建模为两级系统，我们表明可以在不破坏时间反向对称性的情况下发生反向传播的电子状态之间的过渡，只要杂质也经历了过渡。相关的电阻的温度依赖性较弱，降低到非普遍的温度尺度。我们的结果扩展了螺旋边缘模式中已知的反向散射机制的范围，包括不存在电子隧穿系统的场景。
We demonstrate that electrostatic interactions between helical electrons at the edge of a quantum spin Hall insulator and a dynamical impurity can induce quasi-elastic backscattering. Modelling the impurity as a two-level system, we show that transitions between counterpropagating Kramers-degenerate electronic states can occur without breaking time-reversal symmetry, provided that the impurity also undergoes a transition. The associated electrical resistance has a weak temperature dependence down to a non-universal temperature scale. Our results extend the range of known backscattering mechanisms in helical edge modes to include scenarios where electron tunnelling out of the system is absent.
