Particle entanglement spectra for quantum Hall states on lattices

作者：Sterdyniak Antoine^*; Regnault Nicolas; Moeller Gunnar

来源：Physical Review B, 2012, 86(16): 165314.

DOI：10.1103/PhysRevB.86.165314

We use particle entanglement spectra to characterize bosonic quantum Hall states on lattices, motivated by recent studies of bosonic atoms on optical lattices. Unlike for the related problem of fractional Chern insulators, very good trial wave functions are known for fractional quantum Hall states on lattices. We focus on the entanglement spectra for the Laughlin state at nu = 1/2 for the non-Abelian Moore-Read state at nu = 1. We undertake a comparative study of these trial states to the corresponding ground states of repulsive two-body or three-body contact interactions on the lattice. The magnitude of the entanglement gap is studied as a function of the interaction strength on the lattice, giving insight into the nature of Landau-level mixing. In addition, we compare the performance of the entanglement gap and overlaps with trial wave functions as possible indicators for the topological order in the system. We discuss how the entanglement spectra allow to detect competing phases such as a Bose-Einstein condensate.

• 出版日期2012-10-12