Quantization of adiabatic pumped charge in the presence of superconducting lead

Details Quantization of adiabatic pumped charge in the presence of superconducting lead Quantization of adiabatic pumped charge in the presence of superconducting lead

2002-02-20

arxiv.org/abs/cond-mat/0202333v1

Phys. Rev. B Vol.65, 153311 (2002).

Physics

Condensed Matter

Scientific paper

10.1103/PhysRevB.65.153311

We investigate the parametric electron pumping of a double barrier structure in the presence of a superconducting lead. The parametric pumping is facilitated by cyclic variation of the barrier heights $x_1$ and $x_2$ of the barriers. In the weak coupling regime, there exists a resonance line in the parameter space $(x_1,x_2)$ so that the energy of the quasi-bound state is in line with the incoming Fermi energy. Levinson et al found recently that the pumped charge for each pumping cycle is quantized with $Q=2e$ for normal structure when the pumping contour encircles the resonance line. In the presence of a superconducting lead, we find that the pumped charge is quantized with the value $2e$.

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