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arXiv 2007.15612cond-mat.mes-hall
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自旋轨道耦合电子气的电子-电子散射和输运性质

Electron-electron scattering and transport properties of spin-orbit coupled electron gas

K. E. Nagaev, A. A. Manoshin

摘要:

我们计算了具有强自旋-轨道耦合的二维电子气的电导率和热导率,其中散射主要由电子-电子碰撞决定。尽管在系统中明显缺乏伽利略不变性,两粒子散射不影响带交叉点以上的电导率,其中两个螺旋带被填充。在一个螺旋度带为空的带交叉点以下,开启电子-电子散射仅导致电导率的有限降低,因此其高温值与散射强度无关。与此相反,热导率不强烈的自旋-轨道耦合的影响,只有一个扭结的费米能级通过带交叉点。

英文摘要:

We calculate the electrical and thermal conductivity of a two-dimensional electron gas with strong spin--orbit coupling in which the scattering is dominated by electron--electron collisions. Despite the apparent absence of Galilean invariance in the system, the two-particle scattering does not affect the electrical conductivity above the band-crossing point where both helicity bands are filled. Below the band-crossing point where one helicity band is empty, switching on the electron--electron scattering leads only to a limited decrease of the electrical conductivity, so that its high-temperature value is independent of the scattering intensity. In contrast to this, thermal conductivity is not strongly affected by the spin-orbit coupling and exhibits only a kink as the Fermi level passes through the band-crossing point.

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