Revealing temperature evolution of the Dirac band in ZrTe5 via magneto-infrared spectroscopy
Abstract
We report the temperature evolution of the Dirac band in semiconducting zirconium pentatelluride (ZrTe5) 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 ZrTe5, 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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