Research output: Contribution to journal › Article › peer-review
Quantum capacitance of a three-dimensional topological insulator based on HgTe. / Kozlov, D. A.; Bauer, D.; Ziegler, J. et al.
In: Low Temperature Physics, Vol. 43, No. 4, 01.04.2017, p. 430-436.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Quantum capacitance of a three-dimensional topological insulator based on HgTe
AU - Kozlov, D. A.
AU - Bauer, D.
AU - Ziegler, J.
AU - Fischer, R.
AU - Savchenko, M. L.
AU - Kvon, Z. D.
AU - Mikhailov, N. N.
AU - Dvoretsky, S. A.
AU - Weiss, D.
PY - 2017/4/1
Y1 - 2017/4/1
N2 - The quantum capacitance that directly characterizes the density of states of highly mobile Dirac two-dimensional states formed on the surface of a stressed HgTe film is studied experimentally. It is shown that, as opposed to the oscillations in the magnetotransport to which all the existing types of carriers contribute, the quantum oscillations observed in the magnetic capacitance correspond to electrons on the upper surface of the film. Thus, capacitance spectroscopy is a selective technique for studying the properties of an individual topological surface, even when a large number of bulk carriers are present. Because of this feature, for the first time we have obtained data on the phase shift in the Shubnikov-de Haas oscillations usually associated with the Berry phase for an isolated Dirac cone and found its dependence on the location of the Fermi level.
AB - The quantum capacitance that directly characterizes the density of states of highly mobile Dirac two-dimensional states formed on the surface of a stressed HgTe film is studied experimentally. It is shown that, as opposed to the oscillations in the magnetotransport to which all the existing types of carriers contribute, the quantum oscillations observed in the magnetic capacitance correspond to electrons on the upper surface of the film. Thus, capacitance spectroscopy is a selective technique for studying the properties of an individual topological surface, even when a large number of bulk carriers are present. Because of this feature, for the first time we have obtained data on the phase shift in the Shubnikov-de Haas oscillations usually associated with the Berry phase for an isolated Dirac cone and found its dependence on the location of the Fermi level.
KW - DENSITY-OF-STATES
UR - http://www.scopus.com/inward/record.url?scp=85019663378&partnerID=8YFLogxK
U2 - 10.1063/1.4983330
DO - 10.1063/1.4983330
M3 - Article
AN - SCOPUS:85019663378
VL - 43
SP - 430
EP - 436
JO - Low Temperature Physics
JF - Low Temperature Physics
SN - 1063-777X
IS - 4
ER -
ID: 10036106