B. Srinivasan et al., MULTICONFIGURATIONAL SYMMETRIZED-PROJECTOR QUANTUM MONTE-CARLO METHODFOR LOW-LYING EXCITED-STATES OF THE HUBBARD-MODEL, Physical review. B, Condensed matter, 54(4), 1996, pp. 2276-2279
We develop a multiconfigurational symmetrized-projector quantum Monte
Carlo (MSPQMC) method to calculate excited-state properties of Hubbard
models. We compare the MSPQMC results for finite Hubbard chains with
exact results (where available) of with density-matrix renormalization
-group results for longer chains. The energies and correlation functio
ns of the excited states are in good agreement with those obtained fro
m the alternate techniques.