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

2010/05/31 by David Futterer, D. Futterer, Michele Governale +3
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Ferromagnetism #Proximity effect (electron beam lithography) #Quantum #Quantum and electron transport phenomena #Quantum dot #Spin (aerodynamics) #Superconductivity #Topological Materials and Phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1209/0295-5075/91/47004

published as EPL, 91 (2010) 47004 · 6 pages, 5 figures

openalex publication_date 2010/08/01 · arxiv created 2010/09/06 · arxiv updated 2010/09/07 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06

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.

Citations

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