Temperature dependence of the energy band gap in ZrTe${}_5$: implications for the topological phase

Abstract

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 $E_g=(5\pm 1)$ meV at low temperatures and increases monotonously when the temperature is raised. This implies that ZrTe${}_5$ is a weak topological insulator, with non-inverted ordering of electronic bands in the center of the Brillouin zone. Our magneto-transport experiments performed in parallel show that the resistivity anomaly in ZrTe${}_5$ is not connected with the temperature dependence of the band gap.

6 pages, 2 figures

References in corpus (9)

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• Observation and control of the weak topological insulator state in ZrTe5
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Cited by in corpus (10)

• Semi-Dirac Fermions in a Topological Metal
• Gate-tunable multiband transport in ZrTe5 thin devices
• Revealing temperature evolution of the Dirac band in ZrTe${}_5$ via magneto-infrared spectroscopy
• Temperature effects in topological insulators of transition metal dichalcogenide monolayers
• Magneto-optical response of the Weyl semimetal NbAs: Experimental results and hyperbolic-band computations
• Exchange gap in GdPtBi probed by magneto-optics
• Pseudo anomalous Hall effect in semiconductors and semimetals: A classical perspective
• Inducing Quantum Phase Transitions in Non-Topological Insulators Via Atomic Control of Sub-Structural Elements
• Quasi-Dirac points in electron-energy spectra of crystals
• Temperature-Dependent Collective Excitations in a Three-Dimensional Dirac System ZrTe${}_5$