title: Single charge current in a normal mesoscopic region attached to superconductor leads via a coupled poisson nonequilibrium green function formalism.
abstract: We study the I-V characteristic of mesoscopic systems or quantum dot (QD) attached to a pair of superconducting leads. Interaction effects in the QD are considered through the charging energy of the QD; that is, the treatment of current transport under a voltage bias is performed within a coupled Poisson nonequilibrium Green function (PNEGF) formalism. We derive the expression for the current in full generality but consider only the regime where transport occurs only via a single particle current. We show for this case and for various charging energies values U 0 and associated capacitances of the QD the effect on the I-V characteristic. Also the influence of the coupling constants on the I-V characteristic is investigated. Our approach puts forward a novel interpretation of experiments in the strong Coulomb regime.
authors: Laboratorio de Física Teórica de Sólidos (LFTS), Centro de Física Teórica y Computacional (CEFITEC), Facultad de Ciencias, Universidad Central de Venezuela, A.P. 47586, Caracas 1041-A, Venezuela.
authors: David
authors: 0000-0001-5450-2119
authors: D
authors: Verrilli
authors: Laboratorio de Física Teórica de Sólidos (LFTS), Centro de Física Teórica y Computacional (CEFITEC), Facultad de Ciencias, Universidad Central de Venezuela, A.P. 47586, Caracas 1041-A, Venezuela.
authors: F P
authors: FP
authors: Marin
authors: Departamento de Física, Universidad Simón Bolívar, A.P. 89000, Caracas 1080-A, Venezuela.
authors: Rafael
authors: 0000-0001-6742-0681
authors: R
authors: Rangel
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D017076:Computer-Aided Design; D025802:Electric Capacitance; D004553:Electric Conductivity; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008962:Models, Theoretical; D045663:Quantum Dots; D055672:Static Electricity