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Theoretical Approach to Spin-current Absorption at an Interface
Kazuhiro Tsutsui,Takehito Yokoyama,Kazuhiro Hosono 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We study the spin current induced by an inhomogeneous spin-orbit coupling due to impurities byusing the Keldysh Green’s function formalism. In particular, we focus on the diffusive contributionsand give their analytical expressions. A spin current is found to be generated in the presence ofboth a gradient in the spin-orbit strength and a gradient in the external electric field. The resultingdiffusive spin current indicates the presence of spin-current absorption at the interface between thematerials with different spin-orbit coupling strengths, which is exemplified with an experimentallyrelevantsetup.