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

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

doi:10.1103/PhysRevB.54.R2276

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

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

Phys. Rev. B 54, R2276(R) – Published 15 July 1996

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.

Received 25 April 1996

DOI:https://doi.org/10.1103/PhysRevB.54.R2276

Authors & Affiliations

Bhargavi Srinivasan^*

Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India

S. Ramasesha^†

Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India and Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur Campus, Bangalore 560 064, India

H. R. Krishnamurthy^‡

Department of Physics, Indian Institute of Science, Bangalore 560 012, India and Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur Campus, Bangalore 560 064, India

^*Electronic address: bhargavi@sscu.iisc.ernet.in
^†Electronic address:ramasesh@sscu.iisc.ernet.in
^‡Electronic address: hrkrish@physics.iisc.ernet.in

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Vol. 54, Iss. 4 — 15 July 1996

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covering condensed matter and materials physics