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Temperature dependence of the energy band gap in ZrTe5 : Implications for the topological phase

Journal Article · · Physical Review. B
 [1];  [2];  [1];  [3];  [4];  [2];  [1]
  1. University of Toulouse (France)
  2. University of Fribourg (Switzerland)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States). Condensed Matter Physics; Stony Brook University, NY (United States)

Using Landau level spectroscopy, we determine the temperature dependence of the energy band gap in zirconium pentatelluride (ZrTe5). We find that the band gap reaches Eg = (5±1) meV at low temperatures and increases monotonously when the temperature is raised. So this implies that ZrTe5 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 ZrTe5 is not connected with the temperature dependence of the band gap.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Swiss National Science Foundation; LNCMI-CNRS
Grant/Contract Number:
SC0012704
OSTI ID:
1963584
Report Number(s):
BNL-224188-2023-JAAM
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 4 Vol. 107; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (38)

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