标题： Rashba自旋电子系统中自旋极化的热电响应 显示英文标题

标题： Thermoelectric response of spin polarization in Rashba spintronic systems

摘要： 受最近在Rashba半导体BiTeX（X=Cl，Br，I）表面附近发现的强自旋-轨道耦合二维（2D）电子气的启发，我们使用弹性散射的线性化玻尔兹曼方程的精确解，计算了二维Rashba模型中自旋极化的热电响应。当费米能级$E_{F}$位于带交叉点以下时，我们发现一种非Edelstein电场引起的自旋极化，其与$E_{F}$成线性关系。我们表明，由温度梯度和电场引起的自旋极化之间的类似Mott关系在$E_{F}$位于带交叉点附近时显著失效。当温度趋于零时，温度梯度引起的自旋极化消失。这些结果与之前通过弛豫时间近似得到的结果不同。 显示英文摘要

摘要： Motivated by recent discovery of strongly spin-orbit coupled two-dimensional (2D) electron gas near the surface of Rashba semiconductors BiTeX (X=Cl, Br, I), we calculate thermoelectric responses of spin polarization in 2D Rashba model using an exact solution of the linearized Boltzmann equation for elastic scattering. When the Fermi energy $E_{F}$ lies below the band crossing point we find a non-Edelstein electric-field induced spin polarization which is linear in $E_{F}$. We show that the Mott-like relation between spin polarizations induced by the temperature gradient and electric field breaks down significantly when $E_{F}$ lies in the vicinity of the band crossing point. As the temperature tends to zero, the temperature-gradient induced spin polarization vanishes. These results differ from previous ones obtained by relaxation time approximations.