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arXiv 1010.6282cond-mat.mes-hall
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螺旋Luttinger液体中自旋和电荷干涉的退相

Dephasing of spin and charge interference in helical Luttinger liquids

Pauli Virtanen, Patrik Recher

摘要:

我们考虑了一个四端Aharonov-Bohm干涉装置,它由量子自旋霍尔绝缘体的两个边缘形成,支持螺旋Luttinger液体(HLL)。我们表明,温度和偏置的干涉振荡的依赖性是链接到两个HLL之间的隧道自旋翻转的量,这是一个独特的签名的HLL。我们预测,自旋退相依赖于电子-电子(e-e)相互作用,但不同的电荷退相由于不同的主导隧穿激发。相反,在具有SU(2)不变性的自旋Luttinger液体中,尽管存在e-e相互作用,不带电的自旋激发可以携带自旋电流而不失相。

英文摘要:

We consider a four-terminal Aharonov-Bohm interference setup formed out of 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 depends on the 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.

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