1996•Physical review. B, Condensed matterOpen access

Multiconfigurational symmetrized-projector quantum Monte Carlo method for low-lying excited states of the Hubbard model

Bhargavi Srinivasan, S. Ramasesha, H. R. Krishnamurthy

Abstract

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) or with density-matrix renormalization-group results for longer chains. The energies and correlation functions of the excited states are in good agreement with those obtained from the alternate techniques.

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Key concepts: Density matrix renormalization group, Hubbard model, Excited state, Quantum Monte Carlo, Projector, Physics, Monte Carlo method, Quantum mechanics