Topological Lifshitz transition and one-dimensional Weyl mode in HfTe5

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 one-dimensional Weyl mode with 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 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.

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Cited by in corpus (14)

• The discovery of three-dimensional Van Hove singularity
• Quantum oscillations and three-dimensional quantum Hall effect in ZrTe${}_5$
• Magnetic field driven Lifshitz transition and one-dimensional Weyl nodes in three-dimensional pentatellurides
• Rashba-splitting-induced topological flat band detected by anomalous resistance oscillations beyond the quantum limit in ZrTe${}_5$
• A High-Flux and High-Efficiency Setup for Magneto-Infrared Spectroscopy
• Spin-Triplet Excitonic Insulator in the Ultra-Quantum Limit of HfTe5
• Importance of the semimetallic state for the quantum Hall effect in HfTe${}_5$
• Quantum theory of the magnetochiral anisotropy coefficient in ZrTe${}_5$
• Field manipulation of Weyl modes in an ideal Dirac semimetal
• Spinor-dominated magnetoresistance driven by the topological phase transition in $\beta$-Ag${}_2$Se
• Isotropic Dirac fermion and anomalous oscillator strength of zeroth Landau level transition
• Thermodynamics of analogue black holes in a non-Hermitian tight-binding model
• Nernst Plateau in the Quantum Limit of Low-Carrier-Density Topological Insulators
• In-Situ Polarimetry in Collimated Magneto-Infrared Spectroscopy System