Quantum transport evidence of the boundary states and Lifshitz transition in Bi${}_4$Br${}_4$

Abstract

The quasi-one-dimensional van der Waals compound Bi${}_4$Br${}_4$ was recently found to be a promising high-order topological insulator with exotic electronic states. In this paper, we study the electrical transport properties of Bi${}_4$Br${}_4$ bulk crystals. Two electron-type samples with different electron concentrations are investigated. Both samples have saturation resistivity behavior in low temperature. In the low-concentration sample, two-dimensional quantum oscillations are clearly observed in the magnetoresistance measurements, which are attributed to the band-bending-induced surface state on the (001) facet. In the high-concentration sample, the angular magnetoresistance exhibits two pairs of symmetrical sharp valleys with an angular difference close to the angle between the crystal planes (001) and (100). The additional valley can be explained by the contribution of the boundary states on the (100) facet. Besides, Hall measurements at low temperatures reveal an anomalous decrease of electron concentration with increasing temperature, which can be explained by the temperature-induced Lifshitz transition. These results shed light on the abundant surface and boundary state transport signals and the temperature-induced Lifshitz transition in Bi${}_4$Br${}_4$.

References in corpus (7)

• Topological Crystalline Insulators
• Anisotropic Magnetotransport and Exotic Longitudinal Linear Magnetoresistance in WTe2 Crystals
• Large-Gap Quantum Spin Hall Insulator in single layer bismuth monobromide Bi${}_4$Br${}_4$
• Material design with the van der Waals stacking of bismuth-halide chains realizing a higher-order topological insulator
• Room-temperature quantum spin Hall edge state in a higher-order topological insulator Bi${}_4$Br${}_4$
• Purely rotational symmetry-protected topological crystalline insulator $\alpha$-Bi4Br4
• Topological edge states in single- and multi-layer Bi${}_4$Br${}_4$

Cited by in corpus (3)

• A robust weak topological insulator in a bismuth halide Bi4Br2I2
• Mass Acquisition of Dirac Fermions in Bi4I4 by Spontaneous Symmetry Breaking
• Quantum Coherent Transport of 1D ballistic states in second order topological insulator Bi${}_4$Br${}_4$