Andreev reflection and tunneling spectrum in metal-superconductor-metal junctions
W. LiMing, J. J. Ouyang, Liangbin Hu
TL;DR
This paper uses the Blonder-Tinkham-Klapwijk theory to analyze the tunneling spectrum in metal-superconductor-metal junctions, revealing complex structures and quantum-like oscillations in interface charge.
Contribution
It extends the analysis of tunneling spectra to metal-superconductor-metal junctions, highlighting additional resonance features and charge oscillations not seen in simpler junctions.
Findings
Resonance at bias voltages above the energy gap
Quantum-like oscillations in interface charge
More complex tunneling spectrum compared to metal-superconductor junctions
Abstract
The tunneling spectrum of an electron and a hole in metal-superconductor-metal junctions is computed using the Blonder-Tinkham-Klapwijk theory. The incident and the outgoing currents finally balance each other by an interface charge inside the superconductor and metal junction. The present computation shows a more abundant structure compared to that on a metal-superconductor junction, such as the resonance at bias voltages above the energy gap of the superconductor. The density of the interface charge shows a quantum-like oscillation.
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