Originating from the studies of two-dimensional condensed-matter states, the concept of
topological order has recently been expanded to other fields of physics and engineering …

The recent emergence of two-dimensional layered materials—in particular the transition
metal dichalcogenides—provides a new laboratory for exploring the internal quantum …

Recently discovered, valley photonic crystals (VPCs) mimic many of the unusual properties
of two-dimensional (2D) gapped valleytronic materials,,,,,,. Of the utmost interest to optical …

Electron valley, a degree of freedom that is analogous to spin, can lead to novel topological
phases in bilayer graphene. A tunable bandgap can be induced in bilayer graphene by an …

Topological phases with insulating bulk and gapless surface or edge modes have attracted
intensive attention because of their fundamental physics implications and potential …

Topological photonics has emerged as a promising field in photonics that is able to shape
the science and technology of light. As a significant degree of freedom, valley is introduced …

We show that bilayer graphene in the presence of a 2D superlattice potential provides a
highly tunable setup that can realize a variety of flat band phenomena. We focus on two …

We investigate the occurrence of acoustic topological edge states in a 2D phononic elastic
waveguide due to a phenomenon that is the acoustic analog of the quantum valley Hall …

Electronic states at domain walls in bilayer graphene are studied by analyzing their four-and
two-band continuum models, by performing numerical calculations on the lattice, and by …

When atomically thin two-dimensional (2D) materials are layered, they often form
incommensurate noncrystalline structures that exhibit long-period moiré patterns when …