Local Hilbert space fragmentation and weak thermalization in Bose-Hubbard diamond necklaces
Local Hilbert space fragmentation and weak thermalization in Bose-Hubbard diamond necklaces
We study Bose-Hubbard models in a family of diamond necklace lattices with $n$ central sites. The single-particle spectrum of these models presents compact localized states (CLSs) that occupy the up and down sites of each diamond. By performing an appropriate basis rotation, the fragmentation of the many-boson Hilbert space becomes …