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.
Cite
@article{arxiv.cond-mat/0409180,
title = {Spin-dependent Andreev reflection tunneling through a quantum dot with intradot spin-flip scattering},
author = {Xiufeng Cao and Yaoming Shi and Xiaolong Song and Shiping Zhou and Hao Chen},
journal= {arXiv preprint arXiv:cond-mat/0409180},
year = {2009}
}
Comments
14 pages, 4 figures