Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-09-08
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 4 figures
Scientific paper
10.1103/PhysRevB.70.235341
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.
Cao Xiufeng
Chen Hao
Shi Yaoming
Song Xiaolong
Zhou Shiping
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