Landolt-Börnstein - Group III Condensed Matter

3.13 Superconducting QPCs

Abstract

This chapter provides a brief discussion on superconducting quantum point contacts (QPCs). The superconducting QPCs have been fabricated in high-mobility InAs layers, where niobium (Nb) contacts serve as ohmic contacts to high-mobility electron gas which can be tuned via split-gate electrodes. In such systems measurements of the normalized differential resistance have been performed as a function of gate electrode bias. As the QPC is defined the differential resistance at zero bias decreases, and the excess current is attributed to Andreev reflected holes which are focused towards the QPC. Related measurements of coherent Andreev backscattering have subsequently been reported in the disordered limit. Both the critical current and conductance are plotted as a function of the applied gate-bias.

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Title
3.13 Superconducting QPCs
Book Title
Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires
In
3 Quantized transport
Book DOI
10.1007/b55682
Chapter DOI
10.1007/10479560_26
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
34B1
Editors
  • B. Kramer
  • Authors
  • D. Wharam
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