Probing the exchange field of a quantum-dot spin valve by a superconducting lead

Abstract

Electrons in a quantum-dot spin valve, consisting of a single-level quantum dot coupled to two ferromagnetic leads with magnetizations pointing in arbitrary directions, experience an exchange field that is induced on the dot by the interplay of Coulomb interaction and quantum fluctuations. We show that a third, superconducting lead with large superconducting gap attached to the dot probes this exchange field very sensitively. In particular, we find striking signatures of the exchange field in the symmetric component of the supercurrent with respect to the bias voltage applied between the ferromagnets already for small values of the ferromagnets' spin polarization.

published version, 10 pages, 7 figures

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Cited by in corpus (13)

• Transport through quantum-dot spin valves containing magnetic impurities
• Unconventional Superconductivity in Double Quantum Dots
• Electronic waiting-time distribution of a quantum-dot spin valve
• Proximity effect on spin-dependent conductance and thermopower of correlated quantum dots
• Superconducting proximity effect and zero-bias anomaly in transport through quantum dots weakly attached to ferromagnetic leads
• Renormalization effects in interacting quantum dots coupled to superconducting leads
• Kondo physics in double quantum dot based Cooper pair splitters
• Fractional Josephson effect versus fractional charge in superconducting-normal metal hybrid circuits
• Influence of spin waves on transport through a quantum-dot spin valve
• Odd-triplet superconductivity in single-level quantum dots
• Josephson response of a conventional and a noncentrosymmetric superconductor coupled via a double quantum dot
• Solution of master equations by fermionic-duality: Time-dependent charge and heat currents through an interacting quantum dot proximized by a superconductor
• Current fluctuations of noncollinear single-electron spin-valve transistors