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Speaker:
Hao Xu from William and Mary
Title:
Magnetic orders in the 2D repulsive Hubbard model
Abstract:
We systematically study the ground state of the two-dimensional repulsive Hubbard model as a function of doping and interaction strengths, using the auxiliary field quantum Monte-Carlo (AFQMC) method combined with a self-consistent constraint to control the sign problem. We focus on the spin and charge correlations, applying pinning fields to break translational symmetry and computing the spin and charge densities to probe the emergence of long-range order and collective modes. A phase diagram of spin-density waves at infinity lattice on both sides is obtained. Other properties like double occupancy, effective hopping, conductivity are also discussed.