Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-10-06
Int. J. Mod. Phys. B 17, 5991 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1142/S0217979203023537
We present a simple and pedagogical derivation of the spin current as the linear response to an external electric field for both Rashba and Luttinger spin-orbital coupling Hamiltonians. Except for the adiabatic approximation, our derivation is exact to the linear order of the electric field for both models. The spin current is a direct result of the difference in occupation levels between different bands. Moreover, we show a general topological spin current can be defined for a broad class of spin-orbit coupling systems.
Bernevig Andrei B.
Hu Jiangping
Wu Congjun
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