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.

References in corpus (12)

• Evidence for a Strong Topological Insulator Phase in $\mathrm{ZrT}{\mathrm{e}}_5$
• Spectroscopic evidence for bulk-band inversion and three-dimensional massive Dirac fermions in ZrTe5
• Gigantic magnetochiral anisotropy in the topological semimetal ZrTe5
• Photoinduced Dirac semimetal in ZrTe5
• Dirac electron behavior and NMR evidence for topological band inversion in ZrTe5
• Induced anomalous Hall effect of massive Dirac fermions in ZrTe5 and HfTe5 thin flakes
• Probing the semiconductor to semimetal transition in InAs/GaSb double quantum wells by magneto-infrared spectroscopy
• Anomalous Hall effect at the Lifshitz transition in ZrTe5
• Temperature dependence of the energy band gap in ZrTe${}_5$: implications for the topological phase
• Gap-opening transition in Dirac semimetal ZrTe${}_5$
• Band Structure Driven Thermoelectric Response of Topological Semiconductor ZrTe${}_5$
• Propagation of longitudinal acoustic phonons in ZrTe${}_5$ exposed to a quantizing magnetic field

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${}_5$