Magnetoconductance oscillations in semiconductor-superconductor junctions with a laterally isolating barrier layer inside semiconductor region

  • Young-Chung Hsue
  • Tzong-Jer Yang
  • Ben-Yuan GuEmail author
  • Jian Wang
Original Paper


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.


Reflection Wave Function Potential Barrier Propagation Mode Barrier Layer 
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Copyright information

© Springer-Verlag Berlin/Heidelberg 2003

Authors and Affiliations

  • Young-Chung Hsue
    • 1
  • Tzong-Jer Yang
    • 1
  • Ben-Yuan Gu
    • 2
    Email author
  • Jian Wang
    • 3
  1. 1.Department of ElectrophysicsNational Chiao Tung UniversityHsinchuTaiwan
  2. 2.Institute of PhysicsThe Chinese Academy of SciencesBeijingPR China
  3. 3.Department of PhysicsThe University of Hong KongHong KongPR China

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