We measure the quantum capacitance and probe thus directly the electronic density of states of the high mobility, Dirac type of two-dimensional electron system, which forms on the surface of strained HgTe. Here we show that observed magneto-capacitance oscillations probe, in contrast to magnetotransport, primarily the top surface. Capacitance measurements constitute thus a powerful tool to probe only one topological surface and to reconstruct its Landau level spectrum for different positions of the Fermi energy.
@article{arxiv.1511.00606,
title = {Probing quantum capacitance in a 3D topological insulator},
author = {D. A. Kozlov and D. Bauer and J. Ziegler and R. Fischer and M. L. Savchenko and Z. D. Kvon and N. N. Mikhailov and S. A. Dvoretsky and D. Weiss},
journal= {arXiv preprint arXiv:1511.00606},
year = {2016}
}
Comments
5 pages of the main text with 3 figures + 10 appendix pages with 7 figures