Fractional quantum Hall effect in optical lattices

In this research, we study the bosonic fractional quantum Hall (FQH) states in a system of ultracold bosons in a two-dimensional optical lattice in the presence of a synthetic magnetic field, described by the bosonic Harper-Hofstadter Hamiltonian. We use the cluster Gutzwiller mean-field and exact diagonalization techniques in our work. We obtain incompressible states as ground states at various filling factors similar to those of the FQH states. We focus in particular on the nu = 1/2 FQH state, and it is characterized by the two-point correlation function and the many-body Chern number. We further investigate the effect of dipolar interaction on the nu = 1/2 FQH state. We find that the dipolar interaction stabilizes the FQH state against the competing superfluid state.

Automated summary

In this research, we investigate the bosonic fractional quantum Hall (FQH) states in a two-dimensional optical lattice with a synthetic magnetic field, described by the bosonic Harper-Hofstadter Hamiltonian. We utilize cluster Gutzwiller mean-field and exact diagonalization techniques to study these states. We observe incompressible states resembling FQH states at various filling factors. Our particular focus is on the nu = 1/2 FQH state, characterized by the two-point correlation function and the many-body Chern number. Furthermore, we examine the impact of dipolar interaction on the nu = 1/2 FQH state, finding that it stabilizes the FQH state against the competing superfluid state.