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 π/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.
|出版ステータス||Published - 2016|
|イベント||28th International Symposium on Superconductivity, ISS 2015 - Tokyo, Japan|
継続期間: 2015 11月 16 → 2015 11月 18
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