Extraordinary Temperature Dependence of the Resonant Andreev Reflection

Details Extraordinary Temperature Dependence of the Resonant Andreev Reflection Extraordinary Temperature Dependence of the Resonant Andreev Reflection

2001-04-02

arxiv.org/abs/cond-mat/0104017v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 figures, LaTeX

Scientific paper

10.1103/PhysRevB.64.134521

An extraordinary temperature dependence of the resonant Andreev reflection via discrete energy level in a normal-metal / quantum-dot / superconductor (N-QD-S) system is predicted theoretically by using Green function technique. The width of zero bias conductance peak in N-QD-S is about $\sqrt{\Gamma _L^2+\Gamma_R^2}$ and does not exhibit thermal broadening, where $\Gamma_L$ and $\Gamma_R$ are the coupling strength between QD and leads. Considering the intra-dot Coulomb interaction, the Coulomb blockade oscillations conducted by Andreev reflection differs dramatically from that in N-QD-N. Instead of thermal broadening, finite temperature induces more resonant peaks around the oscillation peaks of zero temperature. This effect can be applied to determine the coupling strength and QD level spacing in N-QD-S.

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