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Article Dans Une Revue Physical Review Letters Année : 2018

Temperature-Induced Topological Phase Transition in HgTe Quantum Wells

Résumé

We report a direct observation of temperature-induced topological phase transition between trivial and topological insulator in HgTe quantum well. By using a gated Hall bar device, we measure and represent Landau levels in fan charts at different temperatures and we follow the temperature evolution of a peculiar pair of "zero-mode" Landau levels, which split from the edge of electron-like and hole-like subbands. Their crossing at critical magnetic field Bc is a characteristic of inverted band structure in the quantum well. By measuring the temperature dependence of Bc, we directly extract the critical temperature Tc at which the bulk band-gap vanishes and the topological phase transition occurs. Above this critical temperature, the opening of a trivial gap is clearly observed.
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hal-01740166 , version 1 (27-11-2018)

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Aleksandr Kadykov, Sergey S. Krishtopenko, Benoit Jouault, Wilfried Desrat, Wojciech Knap, et al.. Temperature-Induced Topological Phase Transition in HgTe Quantum Wells. Physical Review Letters, 2018, 120 (8), pp.086401. ⟨10.1103/PhysRevLett.120.086401⟩. ⟨hal-01740166⟩
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