Green's function representation of spin pumping effect

Gen Tatara
Phys. Rev. B 94, 224412 – Published 8 December 2016

Abstract

In this study, current pumping by an external potential is studied on the basis of the Keldysh Green's function method, and a pumping formula written in terms of retarded and advanced Green's functions is obtained. It is shown that pumping is essentially driven by a change of particle distribution before and after an external perturbation. The formula is used to study the spin pumping effect in the case of strong sd exchange interaction, and the driving field is identified to be the spin gauge field. At the lowest order in the precession frequency of magnetization, the spin gauge field works as a constant potential, and the system is shown to reduce to a static problem of spin current generation by a time-independent potential with off-diagonal spin components.

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  • Received 22 July 2016
  • Revised 3 November 2016

DOI:https://doi.org/10.1103/PhysRevB.94.224412

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Gen Tatara

  • RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama, 351-0198 Japan

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Issue

Vol. 94, Iss. 22 — 1 December 2016

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