Controllable strain-driven topological phase transition and dominant surface-state transport in HfTe5

Jinyu Liu, Yinong Zhou, Sebastian Yepez Rodriguez, Matthew A. Delmont, Robert A. Welser, Triet Ho, Nicholas Sirica, Kaleb McClure, Paolo Vilmercati, Joseph W. Ziller, Norman Mannella, Javier D. Sanchez-Yamagishi, Michael T. Pettes, Ruqian Wu and Luis A. Jauregui ()
Additional contact information
Jinyu Liu: University of California
Yinong Zhou: University of California
Sebastian Yepez Rodriguez: University of California
Matthew A. Delmont: University of California
Robert A. Welser: University of California
Triet Ho: University of California
Nicholas Sirica: Los Alamos National Laboratory
Kaleb McClure: The University of Tennessee
Paolo Vilmercati: The University of Tennessee
Joseph W. Ziller: University of California
Norman Mannella: The University of Tennessee
Javier D. Sanchez-Yamagishi: University of California
Michael T. Pettes: Los Alamos National Laboratory
Ruqian Wu: University of California
Luis A. Jauregui: University of California

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract The fine-tuning of topologically protected states in quantum materials holds great promise for novel electronic devices. However, there are limited methods that allow for the controlled and efficient modulation of the crystal lattice while simultaneously monitoring the changes in the electronic structure within a single sample. Here, we apply significant and controllable strain to high-quality HfTe5 samples and perform electrical transport measurements to reveal the topological phase transition from a weak topological insulator phase to a strong topological insulator phase. After applying high strain to HfTe5 and converting it into a strong topological insulator, we found that the resistivity of the sample increased by 190,500% and that the electronic transport was dominated by the topological surface states at cryogenic temperatures. Our results demonstrate the suitability of HfTe5 as a material for engineering topological properties, with the potential to generalize this approach to study topological phase transitions in van der Waals materials and heterostructures.

Date: 2024
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DOI: 10.1038/s41467-023-44547-7

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