Signature of pressure-induced topological phase transition in ZrTe5

The layered van der Waals material ZrTe<sub>5</sub> is known as a candidate topological insulator (TI), however its topological phase and the relation with other properties such as an apparent Dirac semimetallic state is still a subject of debate. We employ a semiclassical multicarrier transport (MCT) model to analyze the magnetotransport of ZrTe<sub>5</sub> nanodevices at hydrostatic pressures up to 2 GPa. The temperature dependence of the MCT results between 10 and 300 K is assessed in the context of thermal activation, and we obtain the positions of conduction and valence band edges in the vicinity of the chemical potential. We find evidence of the closing and re-opening of the band gap with increasing pressure, which is consistent with a phase transition from weak to strong TI. This matches expectations from ab initio band structure calculations, as well as previous observations that CVT-grown ZrTe<sub>5</sub> is a weak TI in ambient conditions.

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Publication Details

Journal
npj Quantum Materials
Published
2024-10-05
DOI
https://doi.org/10.1038/s41535-024-00679-7
Citations
4
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
1.35

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article

Signature of pressure-induced topological phase transition in ZrTe5

Endre Tóvári, Péter Makk, János Koltai, Péter Nemes‐Incze et al.
4 citations
npj Quantum Materials
Topological Materials and Phenomena
1.35
article

Signature of pressure-induced topological phase transition in ZrTe5

Endre Tóvári, Péter Makk, János Koltai, Péter Nemes‐Incze, Zoltán Kovács-Krausz, Zoltán Tajkov, Szabolcs Csonka, László Oroszlány, Bogdan Karpiak, Dániel Nagy, Albin Márffy, Saroj P. Dash
article en
4 citations

Abstract

The layered van der Waals material ZrTe<sub>5</sub> is known as a candidate topological insulator (TI), however its topological phase and the relation with other properties such as an apparent Dirac semimetallic state is still a subject of debate. We employ a semiclassical multicarrier transport (MCT) model to analyze the magnetotransport of ZrTe<sub>5</sub> nanodevices at hydrostatic pressures up to 2 GPa. The temperature dependence of the MCT results between 10 and 300 K is assessed in the context of thermal activation, and we obtain the positions of conduction and valence band edges in the vicinity of the chemical potential. We find evidence of the closing and re-opening of the band gap with increasing pressure, which is consistent with a phase transition from weak to strong TI. This matches expectations from ab initio band structure calculations, as well as previous observations that CVT-grown ZrTe<sub>5</sub> is a weak TI in ambient conditions.

npj Quantum MaterialsVol. 9(1)
Eötvös Loránd University (HU), Slovak Academy of Sciences (SK), Budapest University of Technology and Economics (HU), Institute of Experimental Physics of the Slovak Academy of Sciences (SK), Baptist Theological Academy (HU), Plant Protection Institute (HU), HUN-REN Centre for Energy Research (HU), Chalmers University of Technology (SE)
Slovenská Akadémia Vied, VINNOVA, Hungarian Scientific Research Fund, Magyar Tudományos Akadémia, Vetenskapsrådet, National Research, Development and Innovation Office
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Openalex Percentile: Top 19%
Topological Materials and Phenomena
1.35
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