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

By Maksim Zholudev, Aleksandr KADYKOV, Mikhail Fadeev, Michal Marcinkiewicz, Sandra RUFFENACH, Christophe CONSEJO, Wojciech Knap, Jérémie Torres, Sergey Morozov, Vladimir Gavrilenko, Nikolay Mikhailov, Sergey Dvoretskii and Frederic TEPPE

Abstract

International audienceWe 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 B c)

Topics: magnetotransport, magneto-absorption, topological insulator, phase transition, mercury cadmium telluride, Landau levels, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Publisher: 'MDPI AG'
Year: 2019
DOI identifier: 10.3390/condmat4010027
OAI identifier: oai:HAL:hal-02072773v1
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