https://doi.org/10.1140/epjb/e2003-00217-1
Magnetoconductance oscillations in semiconductor–superconductor junctions with a laterally isolating barrier layer inside semiconductor region
1
Department of
Electrophysics, National Chiao Tung University, Hsinchu, 30050,
Taiwan
2
Institute of Physics, The Chinese Academy
of Sciences, PO Box 603, Beijing 100080, PR China
3
Department of Physics, The University of
Hong Kong, Pokfulam Road, Hong Kong, PR China
Corresponding author: a guby@aphy.iphy.ac.cn
Received:
29
May
2002
Revised:
21
March
2003
Published online:
4
August
2003
The oscillatory characteristics of magnetoconductance for a
junction composed of a superconductor and a semiconductor,
in which two
parallel quantum wave guides are coupled with each other through
a potential barrier layer, are studied systematically.
To model the imperfectness of the interface, we introduce a
function scattering potential barrier lying close to
the interface of the junction.
The magnetoconductance oscillations (MCO)
in this system stem from two
sources: one is the interference of wave functions of
quasi-particles due to multiple Andreev reflections at the
interface; the other is attributed to the variation of the number
of the propagation modes when introducing the isolating barrier
layer. The introduction of the isolating layer in the quantum
wave-guides strongly modifies MCO. We also present a physical
picture for the MCO based on a phenomenological argument. The
theoretically fitted results are in good agreement with numerical
ones.
PACS: 73.40.-c – Electronic transport in interface structures / 74.80.Fp – Point contact; SN and SNS junctions / 73.21.Hb – Quantum wires / 85.35.Be – Quantum well devices (quantum dots, quantum wires, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
