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Article Dans Une Revue Physical Review B Année : 2023

Temperature dependence of the energy band gap in ZrTe 5 : Implications for the topological phase

Résumé

Using Landau-level spectroscopy, we determine the temperature dependence of the energy band gap in zirconium pentatelluride (ZrTe 5). We find that the band gap reaches E g = (5 ± 1) meV at low temperatures and increases monotonically when the temperature is raised. This implies that ZrTe 5 is a weak topological insulator, with noninverted ordering of electronic bands in the center of the Brillouin zone. Our magnetotransport experiments performed in parallel show that the resistivity anomaly in ZrTe 5 is not connected with the temperature dependence of the band gap.
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Dates et versions

hal-04240406 , version 1 (13-10-2023)

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I. Mohelsky, J. Wyzula, B A Piot, G D Gu, Q. Li, et al.. Temperature dependence of the energy band gap in ZrTe 5 : Implications for the topological phase. Physical Review B, 2023, 107 (4), pp.L041202. ⟨10.1103/PhysRevB.107.L041202⟩. ⟨hal-04240406⟩
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