In this paper, we investigate the behaviors of the 3-dimensional non-Hermitian double-cover
Lieb model near the band-touching points. The double-cover Lieb model is composed of two …

In recent years, materials with topological flat bands have attracted significant attention due
to their association with extraordinary transport properties and strongly correlated electrons …

A flatband material is a system characterized by energy bands with zero dispersion, allowing
for the compact localization of wavefunctions in real space. This compact localization …