Article

Quantum transport in superconductor–semiconductor junctions

NTT DOCOMO, Edo, Tōkyō, Japan
Physica C Superconductivity (Impact Factor: 0.94). 04/2001; 352(1-4):95-100. DOI: 10.1016/S0921-4534(01)00002-8

ABSTRACT

Experimental and theoretical results of quantum transport in superconductor–semiconductor junctions are summarized. We will first show the experimental results of reentrant behavior of the conductance as well as of giant Andreev backscattering. Then Andreev reflection in the quantum Hall regime is described. The charging effect on the proximity correction is finally discussed.

Download full-text

Full-text

Available from: Hideaki Takayanagi, May 08, 2015
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The quantum transport characteristics of a mesoscopic system are studied. Using the WKB method the current density was derived due to both, normal tunneling and Andreev reflection processes. The tunneling process was treated as a stochastic process, therefore, the energies of the tunneled electrons and the value of the Schottky barrier height at the S–Sm interface are determined by using a Monte-Carlo simulation technique. Numerical calculation of the current has been performed at different temperatures and bias voltage. The obtained results fit nicely with the experimental results in the literature. These results are very important for nanotechnology applications.
    Full-text · Article · Aug 2002 · physica status solidi (b)
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We study the excess conductance due to the superconducting proximity effect in a ballistic two-dimensional electron system subject to an in-plane magnetic field. We show that under certain conditions the interplay of the Zeeman spin splitting and the effect of a screening supercurrent gives rise to a spin-selective Andreev enhancement of the conductance and anomalies in its voltage, temperature and magnetic field characteristics. The magnetic-field influence on Andreev reflection is discussed in the context of using superconducting hybrid junctions for spin detection.
    Full-text · Article · Dec 2004 · Physical Review B
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Gapped excitation spectra of Andreev states in one- and two-dimensional normal systems in contacts with superconductors are analyzed in the presence of a parallel magnetic field. It is shown that in the ballistic regime there is a specific interplay between magnetic field spin splitting and the effect of a proximity-induced screening supercurrent which preserves time-reversal symmetry for certain groups of Andreev states. In this case the thermal conductance of the system remains suppressed well below the normal-state value in a rather wide range of magnetic fields approaching the critical fields of the superconductor.
    Full-text · Article · Jan 2005 · Physica C Superconductivity