Extraordinary temperature dependence of the resonant Andreev reflection

[摘要] 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 root Gamma (2)(L) + Gamma (2)(R) and does not exhibit thermal broadening, where Gamma (L) and Gamma (R) are the coupling strength between QD and leads. Considering the intradot 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.

[关键词] QUANTUM DOTS;ELECTRONIC STATES;TRANSPORT;NANOPARTICLES;CONDUCTANCE;JUNCTIONS;VOLTAGE;SYSTEM