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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Thursday, 02 June 2005
(at 15:15 in room Phy 5.0.21)
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Adiabatic pumping in hybrid normal-superconductor structures

Michele Governale

Fisica teorica della materia condensata
(Quantum Transport & Quantum Information Group)
Scuola Normale Superiore

We present a study of adiabatic pumping in mesoscopic systems in the presence of superconducting leads.
First, we develop a model, based on the scattering formalism, for adiabatic pumping in hybrid normal/superconductor systems with several superconducting leads and at least one normal contact. This method is employed to investigate Andreev-interference ects on the adiabatically pumped charge in a three-arm beam splitter attached to one normal and two superconducting leads with dirent phases of the order parameters.
Second, we present a formalism to study adiabatic pumping through a superconductor-normal-superconductor weak link. At zero temperature, the pumped charge is related to the Berry phase accumulated in a pumping cycle by the Andreev bound states formed in the system, which, in turn, can be written as a function of the scattering matrix of the normal region. Results are presented for the case when the normal region is short compared to the superconducting coherence length.

last modified: 2021.05.05 Wed
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