Entanglement of Hard-Core Bosons in Bipartite Lattices

The entanglement of hard-core bosons in square and honeycomb lattices with nearest-neighbor interactions is estimated by means of quantum Monte Carlo simulations and spin-wave analysis. The particular U(1)-invariant form of the concurrence is used to establish a connection with observables such as density and superfluid density. For specific regimes the concurrence is expressed as a combination of boson density and superfluid density.
Comment: 6 pages, 4 figures. For more information see https://www.physik.uni-kl.de/eggert/papers/index.html