Great progress has been achieved in the research field of topological states of matter during
the past decade. Recently, a quasi–1-dimensional bismuth bromide, Bi4Br4, has been …

Bismuth halogenides, a family of quasi-one-dimensional (1D) materials, including α and α
phases of Bi4Br4 and Bi4I4, have been predicted to exhibit rich and interesting topological …

ABSTRACT Bismuth bromide (a-Bi4Br4) can demonstrate various exotic topological states,
including higher-order topological insulator with hinge states and quantum spin Hall …

Bi4I4 belongs to a novel family of quasi-one-dimensional (1D) topological insulators (TIs).
While its β phase was demonstrated to be a prototypical weak TI, the α phase, long thought …

The past decade has witnessed the burgeoning discovery of a variety of topological states of
matter with distinct nontrivial band topologies. Thus far, most materials that have been …

Mechanical behavior of polycrystalline materials is intimately connected to migration of grain
boundaries, which in turn is dramatically impacted by the presence of defects. In this paper …

A time-reversal invariant two-dimensional (2D) topological insulator (TI) is characterized by
the gapless helical edge states propagating along the perimeter of the system. However, the …

Massive Dirac fermions, which are essential for realizing novel topological phenomena, are
expected to be generated from massless Dirac fermions by breaking the related symmetry …

Mechanical exfoliation is of great potential in the preparation of two-dimensional (2D)
materials such as graphene and transition metal dichalcogenides, offering new …

The bulk-boundary correspondence is a critical concept in topological quantum materials.
For instance, a quantum spin Hall insulator features a bulk insulating gap with gapless …