Certain lattice wave systems in translationally invariant settings have one or more spectral
bands that are strictly flat or independent of momentum in the tight binding approximation …

We review recent progresses in the study of flat band systems, especially focusing on the
fundamental physics related to the singularity of the flat band's Bloch wave functions. We first …

Exciton polaritons, with extremely low effective mass, are regarded as promising candidates
to realize Bose–Einstein condensation in lattices for quantum simulations towards room …

Exciton polaritons, the part-light and part-matter quasiparticles in semiconductor optical
cavities, are promising for exploring Bose–Einstein condensation, non-equilibrium many …

Flatband systems typically host “compact localized states”(CLS) due to destructive
interference and macroscopic degeneracy of Bloch wave functions associated with a …

Microcavity polaritons are light-matter quasiparticles that arise from the strong coupling
between excitons and photons confined in a semiconductor microcavity. They are typically …

Analogies between electronic condensed matter systems and optics attract widespread
attention nowadays, underlying much research in photonics. Prominent examples where …

Semiconductors in all dimensionalities ranging from 0D quantum dots and molecules to 3D
bulk crystals support bound electron–hole pair quasiparticles termed excitons. Over the past …

Topological photonics has emerged recently as a smart approach for realizing robust optical
circuitry, and the study of nonlinear effects is expected to open the door for tunability of …

We study the properties of a weakly interacting Bose-Einstein condensate (BEC) in a flat
band lattice system by using the multiband Bogoliubov theory and discover fundamental …