Topological Mott insulator with bosonic edge modes in one-dimensional fermionic superlattices
Topological Mott insulator with bosonic edge modes in one-dimensional fermionic superlattices
We investigate topological phase transitions driven by interaction and identify a topological Mott insulator state in one-dimensional fermionic optical superlattices through a numerical density-matrix renormalization-group method. Remarkably, the low-energy edge excitations change from spin-1/2 fermionic single-particle modes to spin-1 bosonic collective modes across the phase transition. Due to spin-charge separation, …