Coherent electronic transport through a superconducting film
M. Bozovic, Z. Pajovic, and Z. Radovic
TL;DR
This paper analyzes quantum transport in superconducting films connected to normal metals, deriving simple formulas for conductance and density of states, and exploring effects like quasiparticle interference and geometrical resonances.
Contribution
It provides analytical expressions for transport properties in clean superconducting films with transparent interfaces, highlighting interference effects and their spectroscopic implications.
Findings
Periodic vanishing of Andreev reflection at geometrical resonances
Quasiparticle interference causes subgap transport variations
Application to spectroscopic measurements of superconducting parameters
Abstract
We study coherent quantum transport through a superconducting film connected to normal-metal electrodes. Simple expressions for the differential conductance and the local density of states are obtained in the clean limit and for transparent interfaces. Quasiparticle interference causes periodic vanishing of the Andreev reflection at the energies of geometrical resonances, subgap transport, and gapless superconductivity near the interfaces. Application of the results to spectroscopic measurements of the superconducting gap and the Fermi velocity is analyzed.
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