%A Cong Xiao,Dingping Li,Zhongshui Ma %T Thermoelectric response of spin polarization in Rashba spintronic systems %0 Journal Article %D 2016 %J Front. Phys. %J Frontiers of Physics %@ 2095-0462 %R 10.1007/s11467-016-0566-5 %P 117201- %V 11 %N 3 %U {https://journal.hep.com.cn/fop/EN/10.1007/s11467-016-0566-5 %8 2016-06-08 %X

Motivated by the recent discovery of a strongly spin–orbit-coupled two-dimensional (2D) electron gas near the surface of Rashba semiconductors BiTeX (X= Cl, Br, I), we calculate the thermoelectric responses of spin polarization in a 2D Rashba model. By self-consistently determining the energyand band-dependent transport time, we present an exact solution of the linearized Boltzmann equation for elastic scattering. Using this solution, we find a non-Edelstein electric-field-induced spin polarization that is linear in the Fermi energy EF when EF lies below the band crossing point. The spin polarization efficiency, which is the electric-field-induced spin polarization divided by the driven electric current, increases for smaller EF .We show that, as a function of EF, the temperaturegradient-induced spin polarization increases continuously to a saturation value when EF decreases below the band crossing point. As the temperature tends to zero, the temperature-gradient-induced spin polarization vanishes.