Loop Current and Antiferromagnetic States in Fermionic Hubbard Model with Staggered Flux at Half Filling
arXiv:1511.04225 · doi:10.1016/j.phpro.2016.04.007
Abstract
Anticipating realization of interacting fermions in an optical lattice with a large gauge field, we consider phase transitions and loop currents in a two-dimensional S=1/2 fermionic-Hubbard model with /2-staggered flux at half filling. We use a variational Monte Carlo method, which is reliable even for strong correlations. As a trial wave function, a coexistent state of antifferomagnetic and staggered-flux orders is studied. In a strongly correlated regime, the ground state becomes an insulating coexistent state with loop currents. By comparing fermions with bosons, we discuss an important role of Pauli principle.
4 pages, 4 figures, submitted to Physics Procedia as proceedings of ISS2015