Abstract
We discuss the magnetoconductance oscillations in small junctions of a ballistic semiconductor and a superconductor. The conductance is calculated both numerically and analytically based on the Bogoliubov-de Gennes equation. The conductance oscillations appear when the Andreev reflection is not perfect at the interface and the diameter of the cyclotron motion of a quasiparticle is comparable to the width of the junction. An interplay between the cyclotron motion of a quasiparticle near the interface and the phase shift by the magnetic field is the origin of the conductance oscillations.
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