Details

Autor(en) / Beteiligte

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

Titel

Topological Lifshitz transition and one-dimensional Weyl mode in HfTe5

Ist Teil von

• Nature materials, 2023-01, Vol.22 (1), p.84-91

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2023

Quelle

Nature_系列刊

Beschreibungen/Notizen

• 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 HfTe 5 , 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. The manuscript reports on the experimental observation of a Lifshitz transition in a topological insulator HfTe 5 subject to a strong magnetic field, which results in the formation of topological one-dimensional Weyl modes in the bulk of a three-dimensional material.