Extraordinary temperature dependence of the resonant Andreev reflection

Article

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

DOI  :  10.1103/PhysRevB.64.134521

来源: SCIE

【 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.

【 授权许可】

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