Nonlinear transport theory for hybrid normal-superconducting devices
Jian Wang, Yadong Wei, Hong Guo, Qing-feng Sun, Tsung-han Lin
DOI 10.1103/PhysRevB.64.104508 · Physical Review B
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Abstract
We report a theory for analyzing nonlinear DC transport properties of mesoscopic or nanoscopic normal-superconducting (NS) systems. Special attention was paid such that our theory satisfies gauge invariance. At the nonlinear regime, our theory allows the investigation of a number of important problems: for NS hybrid systems we have derived the general nonlinear current-voltage characteristics in terms of the scattering Green’s function, the second-order nonlinear conductance at the weakly nonlinear regime, and nonequilibrium charge pileup in the device that defines the electrochemical capacitance coefficients.
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