Dephasing of spin and charge interference in helical Luttinger liquids
Dephasing of spin and charge interference in helical Luttinger liquids
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DOI：
10.1103/physrevb.83.115332
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发表时间：
2010-10
影响因子：
3.7
通讯作者：
P. Virtanen;P. Recher
中科院分区：
文献类型：
--
作者：
P. Virtanen;P. Recher
我们考虑了一个由量子自旋霍尔绝缘体的两个边缘形成的四端Aharonov-Bohm干涉装置，支持螺旋Luttinger液体（hls）。我们证明了干涉振荡的温度和偏置依赖关系与两个高能级粒子之间隧穿的自旋翻转量有关，这是高能级粒子的独特特征。我们预测自旋减相总是受到电子-电子（$e$-$e$）相互作用的影响，但由于明显的显性隧道激励，与电荷减相不同。相反，在具有SU(2)不变性的旋转Luttinger液体中，尽管存在$e$-$e$相互作用，但不带电的自旋激发可以携带自旋电流而不减相。
We consider a four-terminal Aharonov-Bohm interference setup formed from two edges of a quantum spin Hall insulator, supporting helical Luttinger liquids (HLLs). We show that the temperature and bias dependence of the interference oscillations are linked to the amount of spin flips in tunneling between two HLLs which is a unique signature of a HLL. We predict that spin dephasing is always affected by electron-electron ($e$-$e$) interaction but differently from the charge dephasing due to distinct dominant tunneling excitations. In contrast, in a spinful Luttinger liquid with SU(2) invariance, uncharged spin excitations can carry spin current without dephasing in spite of the presence of $e$-$e$ interactions.