Signature of pressure-induced topological phase transition in ZrTe5
Artikel i vetenskaplig tidskrift, 2024
The layered van der Waals material ZrTe5 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 ZrTe5 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 ZrTe5 is a weak TI in ambient conditions.
Författare
Zoltan Kovacs-Krausz
Budapesti Muszaki es Gazdasagtudomanyi Egyetem
Dániel Nagy
Eötvös Loránd University (ELTE)
Albin Márffy
Budapesti Muszaki es Gazdasagtudomanyi Egyetem
Bogdan Karpiak
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Zoltán Tajkov
Magyar Tudomanyos Akademia
Slovak Academy of Sciences
László Oroszlány
Budapesti Muszaki es Gazdasagtudomanyi Egyetem
Eötvös Loránd University (ELTE)
János Koltai
Eötvös Loránd University (ELTE)
Péter Nemes-Incze
Magyar Tudomanyos Akademia
Saroj Prasad Dash
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Péter Makk
Budapesti Muszaki es Gazdasagtudomanyi Egyetem
Szabolcs Csonka
Budapesti Muszaki es Gazdasagtudomanyi Egyetem
Endre Tóvári
Budapesti Muszaki es Gazdasagtudomanyi Egyetem
npj Quantum Materials
23974648 (eISSN)
Vol. 9 1 76Ämneskategorier
Oorganisk kemi
Materialkemi
Den kondenserade materiens fysik
DOI
10.1038/s41535-024-00679-7
PubMed
39376244