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The realization of the coexistence of various topologically nontrivialsurface states in one material is expected to lay a foundation for new electricapplications with selective robust spin current. Here we apply themagnetoconductivity characteristic and angle-resolved photoemissionspectroscopy (ARPES) to visualize the surface-selected electronic featuresevolution of quasi-one-dimensional material Bi4Br4. The transport measurementsindicate the quantum interference correction to conductivity possesses symbolicspin rotational characteristic correlated to the value of Berry phase with theeffects of weak localization and weak antilocalization for (001) and (100)surfaces, respectively. The ARPES spectra provide the experimental evidence forquasi-one-dimensional massless Dirac surface state at the side (100) surfaceand anisotropic massive Dirac surface state at the top (001) surface,respectively, which is highly coincide with the angle-dependent scalingbehavior of magnetoconductivity. Our results reveal the facet dependenttopological phases in quasi-one-dimensional Bi4Br4, stimulating the furtherinvestigations of this dual topology classes and the applications of thefeasible technologies of topological spintronics.

Facet Dependent Topological Phase Transition in Bi4Br4