Theory of spin pumping through an interacting quantum dot tunnel coupled to a ferromagnet with time-dependent magnetization

Abstract

We investigate two schemes for pumping spin adiabatically from a ferromagnet through an interacting quantum dot into a normal lead, which exploit the possibility to vary in time the ferromagnet's magnetization, either its amplitude or its direction. For this purpose, we extend a diagrammatic real-time technique for pumping to situations in which the leads' properties are time dependent. In the first scheme, the time-dependent magnetization amplitude is combined with a time-dependent level position of the quantum dot to establish both a charge and a spin current. The second scheme uses a uniform rotation of the ferromagnet's magnetization direction to generate a pure spin current without a charge current. We discuss the influence of an interaction-induced exchange field on the pumping characteristics.

18 pages, 11 figures, presentation of results has been restructured and new references have been added

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Cited by in corpus (10)

• Heat, molecular vibrations, and adiabatic driving in non-equilibrium transport through interacting quantum dots
• Interaction effect on adiabatic pump of charge and spin in quantum dot
• Gauge freedom in observables and Landsbergs nonadiabatic geometric phase: pumping spectroscopy of interacting open quantum systems
• Thermodynamics and steady state of quantum motors and pumps far from equilibrium
• Functional renormalization group in Floquet space
• Spin backflow: a non-Markovian effect on spin pumping
• Nonadiabaticity in spin pumping under relaxation
• Quantum transport phenomena induced by time-dependent fields
• Breaking of Coulomb blockade by macrospin-assisted tunneling
• Coherent and Dissipative Spin Torques in Quantum Dots: A Unified Framework for Quantum Spin Dynamics