Facet Dependent Topological Phase Transition in Bi4Br4

TL;DR

This study investigates the facet-dependent topological phase transitions in Bi4Br4, revealing different surface states and quantum interference effects on different crystal facets, with implications for topological spintronics.

Contribution

It provides experimental evidence of facet-dependent topological phases and surface states in Bi4Br4 using magnetoconductivity and ARPES techniques, highlighting dual topology classes.

Findings

Quasi-one-dimensional massless Dirac surface state at (100) surface.

Anisotropic massive Dirac surface state at (001) surface.

Facet-dependent quantum interference effects related to Berry phase.

Abstract

The realization of the coexistence of various topologically nontrivial surface states in one material is expected to lay a foundation for new electric applications with selective robust spin current. Here we apply the magnetoconductivity characteristic and angle-resolved photoemission spectroscopy (ARPES) to visualize the surface-selected electronic features evolution of quasi-one-dimensional material Bi4Br4. The transport measurements indicate the quantum interference correction to conductivity possesses symbolic spin rotational characteristic correlated to the value of Berry phase with the effects of weak localization and weak antilocalization for (001) and (100) surfaces, respectively. The ARPES spectra provide the experimental evidence for quasi-one-dimensional massless Dirac surface state at the side (100) surface and anisotropic massive Dirac surface state at the top (001) surface, respectively, which is highly coincide with the angle-dependent scaling behavior of magnetoconductivity. Our results reveal the facet dependent topological phases in quasi-one-dimensional Bi4Br4, stimulating the further investigations of this dual topology classes and the applications of the feasible technologies of topological spintronics.