We report on transport and capacitance spectroscopy study of two kinds of quantum wells, namely Cd0.02Hg0.98Te and Cd0.06Hg0.94Te with the thicknesses of 7.4 and 11.5 nm, accordingly. The fraction of Cd was chosen in a way that the both quantum wells are expected to have gapless band structure typical for a Dirac fermions system. We have established that the first quantum well exhibits a massless Dirac fermions system with a quality slightly better then in conventional HgTe quantum wells of critical thickness. Second quantum well exhibits a high-quality two-dimensional topological insulator state with the energy gap of around 10 meV and well-defined edge transport making it as a good candidate for further study and applications of topological insulators.
@article{arxiv.1901.10307,
title = {Two-dimension Dirac fermions system in CdHgTe quantum wells},
author = {M. L. Savchenko and D. A. Kozlov and Z. D. Kvon and N. N. Mikhailov and S. A. Dvoretsky and B. A. Piot},
journal= {arXiv preprint arXiv:1901.10307},
year = {2019}
}