Experimental determination of the quasi-particle decay length $ξ_{\text{Sm}}$ in a superconducting quantum well

Details Experimental determination of the quasi-particle decay length $ξ_{\text{Sm}}$ in a superconducting quantum well Experimental determination of the quasi-particle decay length $ξ_{\text{Sm}}$ in a superconducting quantum well

1995-02-09

arxiv.org/abs/cond-mat/9502038v2

Physics

Condensed Matter

Revtex, 3 PostScript figures

Scientific paper

10.1103/PhysRevB.52.R11630

We have investigated experimentally the electronic transport properties of a two-dimensional electron gas (2DEG) present in an AlSb/InAs/AlSb quantum well, where part of the toplayer has been replaced by a superconducting Nb strip, with an energy gap $\Delta_0$. By measuring the lateral electronic transport underneath the superconductor, and comparing the experimental results with a model based on the Bogoliubov-de Gennes equation and the Landauer-B\"uttiker formalism, we obtain a decay length $\xi_{\text{Sm}} \approx 100~\text{nm}$ for electrons. This decay length corresponds to an interface transparency $T_{\text{SIN}}=0.7$ between the Nb and InAs. Using this value, we infer an energy gap in the excitation spectrum of the SQW of $\Delta_{\text{eff}} = 0.97 \Delta_0 = 0.83~\text{meV}$.

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