Phonon-induced backscattering in helical edge states.
Phonon-induced backscattering in helical edge states.
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DOI：
10.1103/physrevlett.108.086602
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发表时间：
2011-09
影响因子：
8.6
通讯作者：
J. C. Budich;F. Dolcini;P. Recher;B. Trauzettel
中科院分区：
文献类型：
--
作者：
J. C. Budich;F. Dolcini;P. Recher;B. Trauzettel
已知在量子自旋霍尔绝缘体的边界处实现的单对螺旋边缘状态对弹性单粒子背散射是鲁棒的，只要保持时间反演对称性。然而，没有对称性阻止非弹性背散射所带来的声子在Rashba自旋轨道耦合的存在下。在这封信中，我们表明，螺旋狄拉克电子的单通道的量子化电导率的保护，甚至对这种非弹性机制，以领先的顺序。我们进一步证明，这一结果仍然有效时，库仑相互作用包括在框架内的螺旋Tomonaga Luttinger液体。
A single pair of helical edge states as realized at the boundary of a quantum spin Hall insulator is known to be robust against elastic single particle backscattering as long as time reversal symmetry is preserved. However, there is no symmetry preventing inelastic backscattering as brought about by phonons in the presence of Rashba spin orbit coupling. In this Letter, we show that the quantized conductivity of a single channel of helical Dirac electrons is protected even against this inelastic mechanism to leading order. We further demonstrate that this result remains valid when Coulomb interaction is included in the framework of a helical Tomonaga Luttinger liquid.