Abstract
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 and of the barriers. In the weak-coupling regime, there exists a resonance line in the parameter space so that the energy of the quasibound 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 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
- Received 19 October 2001
DOI:https://doi.org/10.1103/PhysRevB.65.153311
©2002 American Physical Society