We investigate the Andreev reflection process in high-mobility HgTe/CdTe quantum wells. We find that Andreev conductance probes the dynamics of massive 2+1 Dirac fermions, and that both specular Andreev reflection and retroreflection can be realized even in presence of a large mismatch between the Fermi wavelengths at the two sides of the normal/superconducting junction.
@article{arxiv.1005.1055,
title = {Andreev spectroscopy of doped HgTe quantum wells},
author = {M. Guigou and J. Cayssol},
journal= {arXiv preprint arXiv:1005.1055},
year = {2015}
}