Generation of pure spin currents by superconducting proximity effect in quantum dots

Abstract

We investigate electronic transport in a three-terminal hybrid system, composed by an interacting quantum dot tunnel coupled to one superconducting, one ferromagnetic, and one normal lead. Despite the tendency of the charging energy to suppress the superconducting proximity effect when the quantum dot is in equilibrium, the non-equilibrium proximity effect can give rise to a large Andreev current. The presence of the ferromagnet can lead to a finite spin accumulation on the dot. We find that the interplay of the Andreev current and spin accumulation can generate a pure spin current, with no associated charge transport, in the normal lead. This situation is realised by tuning the quantum-dot spectrum by means of a gate voltage.

6 pages, 5 figures

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Cited by in corpus (11)

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• Interplay between direct and crossed Andreev reflections in hybrid nano-structures
• Renormalization effects in interacting quantum dots coupled to superconducting leads
• Transient dynamics and steady state behavior of the Anderson-Holstein model with a superconducting lead
• Kondo effect and spin-active scattering in ferromagnet-superconductor junctions
• Nonlinear electric and thermoelectric Andreev transport through a hybrid quantum dot coupled to ferromagnetic and superconducting leads
• Electron-electron interaction effects on transport through mesoscopic superconducting hybrid junctions
• Quantum transport phenomena induced by time-dependent fields
• Thermoelectric unipolar spin battery in a suspended carbon nanotube
• Enhanced negative nonlocal conductance in an interacting quantum dot connected to two ferromagnetic leads and one superconducting lead
• Boundary Conditions and Formation of Pure Spin Currents in Magnetic Field