Title: | Magnetoconductance oscillations in semiconductor-superconductor junctions with a laterally isolating barrier layer inside semiconductor region |
Authors: | Hsue, YC Yang, TJ Gu, BY Wang, J 電子物理學系 Department of Electrophysics |
Issue Date: | 1-Jul-2003 |
Abstract: | 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 delta-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. |
URI: | http://dx.doi.org/10.1140/epjb/e2003-00217-1 http://hdl.handle.net/11536/27738 |
ISSN: | 1434-6028 |
DOI: | 10.1140/epjb/e2003-00217-1 |
Journal: | EUROPEAN PHYSICAL JOURNAL B |
Volume: | 34 |
Issue: | 2 |
Begin Page: | 237 |
End Page: | 246 |
Appears in Collections: | Articles |
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