Study of spin transport in Dirac systems

International Workshop on Dirac Electrons in Solids 2015

Okuma, Nobuyuki^1 ; Ogata, Masao^1

Department of Physics, University of Tokyo, Hongo 7-3-1, Tokyo

113-0033, Japan^1

关键词: Diffusion equations;    Dirac electrons;    Keldysh formalism;    Spin currents;    Spin diffusions;    Spin hall conductivity;    Spin transport;    Steady state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/603/1/012018/pdf
DOI  :  10.1088/1742-6596/603/1/012018

来源: IOP

【 摘 要 】

We investigate spin Hall effect in a three-dimensional Dirac electron system. We derive diffusion equations in the Keldysh formalism and define a spin current from a spin diffusion equation. We solve the obtained diffusion equations in a steady state in the bulk and find that the bulk spin Hall conductivity is non-zero, though that for the conventional spin current is zero.