Topological Lifshitz transition and one-dimensional Weyl mode in HfTe5

Wenbin Wu; Zeping Shi; Yuhan Du; Yuxiang Wang; Fang Qin; Xianghao Meng; Binglin Liu; Yuanji Ma; Zhongbo Yan; Mykhaylo Ozerov; Cheng Zhang; Hai-Zhou Lu; Junhao Chu; Xiang Yuan

doi:10.1038/s41563-022-01364-5

Topological Lifshitz transition and one-dimensional Weyl mode in HfTe₅

Nat Mater. 2023 Jan;22(1):84-91. doi: 10.1038/s41563-022-01364-5. Epub 2022 Sep 29.

Authors

Wenbin Wu^#¹, Zeping Shi^#¹, Yuhan Du¹, Yuxiang Wang², Fang Qin³, Xianghao Meng¹, Binglin Liu¹, Yuanji Ma¹, Zhongbo Yan⁴, Mykhaylo Ozerov⁵, Cheng Zhang^{6

7}, Hai-Zhou Lu^{3

8}, Junhao Chu^{9

10

11}, Xiang Yuan^{12

13}

Affiliations

¹ State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China.
² State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai, China.
³ Shenzhen Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, China.
⁴ School of Physics, Sun Yat-Sen University, Guangzhou, China.
⁵ National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA.
⁶ State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai, China. zhangcheng@fudan.edu.cn.
⁷ Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai, China. zhangcheng@fudan.edu.cn.
⁸ Shenzhen Key Laboratory of Quantum Science and Engineering, Shenzhen, China.
⁹ School of Physics and Electronic Science, East China Normal University, Shanghai, China.
¹⁰ Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai, China.
¹¹ Institute of Optoelectronics, Fudan University, Shanghai, China.
¹² State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China. xyuan@lps.ecnu.edu.cn.
¹³ School of Physics and Electronic Science, East China Normal University, Shanghai, China. xyuan@lps.ecnu.edu.cn.

^# Contributed equally.

PMID: 36175521
DOI: 10.1038/s41563-022-01364-5

Abstract

Landau band crossings typically stem from the intra-band evolution of electronic states in magnetic fields and enhance the interaction effect in their vicinity. Here in the extreme quantum limit of topological insulator HfTe₅, we report the observation of a topological Lifshitz transition from inter-band Landau level crossings using magneto-infrared spectroscopy. By tracking the Landau level transitions, we demonstrate that band inversion drives the zeroth Landau bands to cross with each other after 4.5 T and forms a one-dimensional Weyl mode with the fundamental gap persistently closed. The unusual reduction of the zeroth Landau level transition activity suggests a topological Lifshitz transition at 21 T, which shifts the Weyl mode close to the Fermi level. As a result, a broad and asymmetric absorption feature emerges due to the Pauli blocking effect in one dimension, along with a distinctive negative magneto-resistivity. Our results provide a strategy for realizing one-dimensional Weyl quasiparticles in bulk crystals.