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Quantum transport evidence of boundary states and Lifshitz transition in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Br</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
The quasi-one-dimensional van der Waals compound ${\mathrm{Bi}}_{4}{\mathrm{Br}}_{4}$ 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 ${\mathrm{Bi}}_{4}{\mathrm{Br}}_{4}$ bulk crystals. Two electron-type samples with different electron concentrations are investigated. Both samples exhibit a saturation behavior of …