| Issue |
Europhys. Lett.
Volume 58, Number 4, May 2002
|
|
|---|---|---|
| Page(s) | 569 - 575 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00433-3 | |
| Published online | 01 May 2002 | |
Commensurability effects in Andreev antidot billiards
1
Universität Regensburg - D-93040 Regensburg, Germany
2
IMEC - Kapeldreef 75, B-3001 Leuven, Belgium
Corresponding author: jonathan.eroms@physik.uni-regensburg.de
Received:
22
January
2002
Accepted:
4
March
2002
An Andreev billiard was realised in an array of niobium filled antidots in a high-mobility InAs/AlGaSb heterostructure. Below the critical temperature TC of the Nb dots we observe a strong reduction of the resistance around B=0 and a suppression of the commensurability peaks which are usually found in antidot lattices. Both effects can be explained in a classical Kubo approach by considering the trajectories of charge carriers in the semiconductor, when Andreev reflection at the semiconductor-superconductor interface is included. For perfect Andreev reflection, we expect a complete suppression of the commensurability features, even though motion at finite B is chaotic.
PACS: 73.63.-b – Electronic transport in mesoscopic or nanoscale materials and structures / 74.80.-g – Spatially inhomogeneous structures
© EDP Sciences, 2002
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