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Probing Quantum Capacitance in a 3D Topological Insulator

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Kozlov, D. A. ; Bauer, Dominik ; Ziegler, Johannes ; Fischer, Ralf ; Savchenko, M. L. ; Kvon, Z. D. ; Mikhailov, N. N. ; Dvoretsky, S. A. ; Weiss, Dieter
Date of publication of this fulltext: 25 May 2016 07:32


We measure the quantum capacitance and probe thus directly the electronic density of states of the high mobility, Dirac type two-dimensional electron system, which forms on the surface of strained HgTe. Here we show that observed magnetocapacitance oscillations probe-in contrast to magnetotransport-primarily the top surface. Capacitance measurements constitute thus a powerful tool to probe only ...


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