Revealing temperature evolution of the Dirac band in ZrTe${}_5$ via magneto-infrared spectroscopy

Abstract

We report the temperature evolution of the Dirac band in semiconducting zirconium pentatelluride (ZrTe${}_5$) using magneto-infrared spectroscopy. We find that the band gap is temperature independent at low temperatures and increases with temperature at elevated temperatures. Although such an observation seems to support a weak topological insulator phase at all temperatures and defy the previously reported topological phase transition (TPT) at an intermediate temperature in ZrTe${}_5$, we show that it is also possible to explain the observation by considering the effect of conduction-valence band mixing and band inversion with a strong topological insulator phase at low temperatures. Our work provides an alternative picture of the band gap evolution across TPT.

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Cited by in corpus (4)

• Temperature effects in topological insulators of transition metal dichalcogenide monolayers
• Te Vacancy-Driven Anomalous Transport in ZrTe${}_5$ and HfTe${}_5$
• Quasi-Dirac points in electron-energy spectra of crystals
• Temperature-Dependent Collective Excitations in a Three-Dimensional Dirac System ZrTe${}_5$