Kozlov, D. A. and Savchenko, M. L. and Ziegler, J. and Kvon, Z. D. and Mikhailov, N. N. and Dvoretskii, S. A. and Weiss, D. (2016) Capacitance spectroscopy of a system of gapless Dirac fermions in a HgTe quantum well. JETP LETTERS, 104 (12). pp. 859-863. ISSN 0021-3640, 1090-6487
Full text not available from this repository. (Request a copy)Abstract
Information on the density of states of two-dimensional Dirac fermions in a 6.6-nm-thick HgTe quantum well that corresponds to a transition from the direct to inverted spectrum is obtained for the first time by means of capacitance measurements. It is found that the density of states of Dirac electrons is a linear function of the Fermi energy at E (F) > 30 meV with the corresponding velocity vDF = 8.2 x 10(5) m/s. At lower energies, this dependence deviates from the linear law, indicating a strong effect of disorder, which is associated with fluctuations of a built-in charge, on the density of states of the studied system near the Dirac point. At negative energies, a sharp increase in the density of states is observed, which is associated with the tail of the density of states of valleys of heavy holes. The described behavior is in agreement with the proposed model, which includes both the features of the real spectrum of Dirac fermions and the effect of the fluctuation potential.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 12 Apr 2019 05:49 |
| Last Modified: | 12 Apr 2019 05:49 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3814 |
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