Extraordinary temperature dependence of the resonant Andreev reflection
Yu Zhu, Qing-feng Sun, Tsung-han Lin
DOI 10.1103/PhysRevB.64.134521 · Physical Review B
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Abstract
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 ΓL2+ΓR2 and does not exhibit thermal broadening, where ΓL and ΓR 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.
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