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Experimental Observation of Temperature-Driven Topological Phase Transition in HgTe/CdHgTe Quantum Wells

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Department for physics of semiconductors, Institute for Physics of Microstructures RAS, GSP-105, 603950 Nizhny Novgorod, Russia
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Laboratoire Charles Coulomb, UMR CNRS 5221, University of Montpellier, Place Eugène Bataillon-CC069, 34095 Montpellier, France
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Center for Terahertz Research and Applications (CENTERA), Institute for High Pressure Physics, Polish Academy of Sciences, 29/37 Sokołowska Str, 01-142 Warsaw, Poland
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Institut d’Electronique et des Systemes, University of Montpellier, 860, rue Saint Priest, Bâtiment 5-CC 05001, 34090 Montpellier, France
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Institute of Semiconductor Physics, SB RAS, 630090 Novosibirsk, Russia
*
Author to whom correspondence should be addressed.
Condens. Matter 2019, 4(1), 27; https://doi.org/10.3390/condmat4010027
Received: 28 January 2019 / Revised: 23 February 2019 / Accepted: 28 February 2019 / Published: 1 March 2019
We report on the comparison between temperature-dependent magneto-absorption and magnetotransport spectroscopy of HgTe/CdHgTe quantum wells in terms of the detection of the phase transition between the topological insulator and band insulator states. Our results demonstrate that temperature-dependent magnetospectroscopy is a powerful tool to discriminate trivial and topological insulator phases, yet the magnetotransport method is shown to have advantages for the clear manifestation of the phase transition with accurate quantitative values of the transition parameter (i.e., critical magnetic field Bc). View Full-Text
Keywords: topological insulator; phase transition; mercury cadmium telluride; Landau levels; magneto-absorption; magnetotransport topological insulator; phase transition; mercury cadmium telluride; Landau levels; magneto-absorption; magnetotransport
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Zholudev, M.S.; Kadykov, A.M.; Fadeev, M.A.; Marcinkiewicz, M.; Ruffenach, S.; Consejo, C.; Knap, W.; Torres, J.; Morozov, S.V.; Gavrilenko, V.I.; Mikhailov, N.N.; Dvoretskii, S.A.; Teppe, F. Experimental Observation of Temperature-Driven Topological Phase Transition in HgTe/CdHgTe Quantum Wells. Condens. Matter 2019, 4, 27.

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