Ising phase transitions and thermodynamics of correlated fermions in a
2D spin-dependent optical lattice
Ising phase transitions and thermodynamics of correlated fermions in a
2D spin-dependent optical lattice
We present a {\it numerically exact} study of the Hubbard model with spin-dependent anisotropic hopping on the square lattice using auxiliary-field quantum Monte Carlo method. At half-filling, the system undergoes Ising phase transitions upon cooling, leading to the formation of Ising-type antiferromagnetic order for repulsive interactions and charge density wave …