Thursday, January 7, 2016, 1:30 pm — Bldg. 734, ISB Conf. Rm. 201 (upstairs)
Motivated by recent experiments on InAs nanowires with epitaxial Al we investigate the two-terminal conductance of a short proximitized nanowire. We identify the leading electron transport processes at zero applied magnetic field as well as at finite fields, which suppress the induced superconducting gap and drive the system towards the topological transition. In the conventional superconducting phase, the conductance is controlled by the sequential Cooper pair tunneling if the induced gap exceeds the charging energy of the nanowire, and by the elastic single-electron processes if the gap becomes smaller than the charging energy. The latter mechanism yields smaller values of the linear conductance and strongly asymmetric Coulomb blockade peaks, which may explain some experimental findings. Finally, we develop a quantitative theory for the conductance evolution across the transition into the topologically-nontrivial phase.
Hosted by: Alexei Tsvelik
11246 | INT/EXT | Events Calendar
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