Commensurability effects in Andreev antidot billiards
Universität Regensburg - D-93040 Regensburg, Germany
2 IMEC - Kapeldreef 75, B-3001 Leuven, Belgium
Corresponding author: email@example.com
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