Spin-dependent Andreev reflection tunneling through a quantum dot with intradot spin-flip scattering

Abstract

We study Andreev reflection (AR) tunneling through a quantum dot (QD) connected to a ferromagnet and a superconductor, in which the intradot spin-flip interaction is included. By using the nonequibrium-Green-function method, the formula of the linear AR conductance is derived at zero temperature. It is found that competition between the intradot spin-flip scattering and the tunneling coupling to the leads dominantes resonant behaviours of the AR conductance versus the gate voltage.A weak spin-flip scattering leads to a single peak resonance.However, with the spin-flip scattering strength increasing, the AR conductance will develop into a double peak resonannce implying a novel structure in the tunneling spectrum of the AR conductance. Besides, the effect of the spin-dependent tunneling couplings, the matching of Fermi velocity, and the spin polarization of the ferromagnet on the AR conductance is eximined in detail.

14 pages, 4 figures

References in corpus (10)

• Spin relaxation in semiconductor quantum dots
• Andreev Reflection In Ferromagnet-Superconductor Junctions
• Tunneling spectroscopy for ferromagnet/superconductor junctions
• Spin polarized tunneling in ferromagnet/unconventional superconductor junctions
• Nonequilibrium spintronic transport through an artificial Kondo impurity: Conductance, magnetoresistance and shot noise
• Spin-Dependent Transport Through An Interacting Quantum Dot
• Tunneling Via Individual Electronic States in Ferromagnetic Nanoparticles
• Andreev reflection through a quantum dot coupled with two ferromagnets and a superconductor
• Writing Spin in a Quantum Dot with Ferromagnetic and Superconducting Electrodes
• Kondo-type transport through an interacting quantum dot coupled to ferromagnetic leads

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• Magnetoanisotropic spin-triplet Andreev reflection in ferromagnet-Ising superconductor junctions
• Thermoelectric properties of a ferromagnet-superconductor hybrid junction: Role of interfacial Rashba spin-orbit interaction
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• Current cross-correlations and waiting time distributions in Andreev transport through Cooper pair splitters based on triple quantum dots
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• Magnetoresistance and transistor-like behavior of double quantum dots connected to ferromagnetic and superconductor leads
• Nonlinear electric and thermoelectric Andreev transport through a hybrid quantum dot coupled to ferromagnetic and superconducting leads
• Mixed-Valence Transition on a Quantum-Dot Coupled to Superconducting and Spin-Polarized Leads
• Nonlinear heat transport in ferromagnetic-quantum dot-superconducting systems