Adiabatic charge and spin pumping through quantum dots with ferromagnetic leads

Abstract

We study adiabatic pumping of electrons through quantum dots attached to ferromagnetic leads. Hereby we make use of a real-time diagrammatic technique in the adiabatic limit that takes into account strong Coulomb interaction in the dot. We analyze the degree of spin polarization of electrons pumped from a ferromagnet through the dot to a nonmagnetic lead (N-dot-F) as well as the dependence of the pumped charge on the relative leads' magnetization orientations for a spin-valve (F-dot-F) structure. For the former case, we find that, depending on the relative coupling strength to the leads, spin and charge can, on average, be pumped in opposite directions. For the latter case, we find an angular dependence of the pumped charge, that becomes more and more anharmonic for large spin polarization in the leads.

9 pages, 7 figures, published in Phys. Rev. B

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• Gauge freedom in observables and Landsbergs nonadiabatic geometric phase: pumping spectroscopy of interacting open quantum systems
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• Diagrammatic real-time approach to adiabatic pumping through metallic single-electron devices
• Thermodynamics and steady state of quantum motors and pumps far from equilibrium
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• Geometric Fluctuation Theorem
• Theory of spin pumping through an interacting quantum dot tunnel coupled to a ferromagnet with time-dependent magnetization
• Interference and interaction effects in adiabatic pumping through quantum dots
• Geometric energy transport and refrigeration with driven quantum dots
• Non-adiabatic effect in quantum pumping for a spin-boson system
• Adiabatic pumping through an interacting quantum dot with spin-orbit coupling
• Resonant all-electric spin pumping with spin-orbit coupling
• Spin-dependent pump current and noise in an adiabatic quantum pump based on domain walls in a magnetic nanowire
• DC spin generation by junctions with AC driven spin-orbit interaction
• Enhanced photon-assisted spin transport in a quantum dot attached to ferromagnetic leads
• Theory of transport through noncollinear single-electron spin-valve transistors
• Pair-amplitude dynamics in strongly-coupled superconductor-quantum dot hybrids
• Green's function representation of spin pumping effect
• Photovoltaic effect generated by spin-orbit interactions
• Pumped shot noise in adiabatically modulated graphene-based double-barrier structures
• Spin backflow: a non-Markovian effect on spin pumping
• Fano resonance in the nonadiabatic pumped shot noise of a time-dependent potential well
• Microwave response of a magnetic single-electron transistor
• Nonadiabaticity in spin pumping under relaxation
• Quantum transport phenomena induced by time-dependent fields
• Quantum pumping in helimagnet heterostructures
• Current fluctuations of noncollinear single-electron spin-valve transistors