Monte Carlo Simulations for Several Correlated Electron Systems: dp-Model and Periodic Anderson Model
We performed a quantum Monte Carlo simulation for correlated electron systems. We used a stabilized scheme to investigate die ground state properties. Momentum distributions and correlation functions for magnetic and superconducting order parameters are calculated. In the dp-model, a strong antiferromagnetic correlation is present at half-filling with a large d-p energy separation. The momentum distribution is similar to that of the two-dimensional half-filled Hubbard model. When the energy separation is small in a doped system, there is a peak of die magnetic correlation split and it is consistent with the incommensurate structure observed in neutron experiments. In this case, the momentum distribution function is similar to that of the fermi liquid. Results for the periodic Anderson model are also discussed.
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