Off-diagonal Wave Function Monte Carlo Studies of Hubbard Model I

Details Off-diagonal Wave Function Monte Carlo Studies of Hubbard Model I Off-diagonal Wave Function Monte Carlo Studies of Hubbard Model I

2002-06-04

arxiv.org/abs/cond-mat/0206033v1

J. Phys. Soc. Jpn. 67, 3867 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 11 figures

Scientific paper

We propose a Monte Carlo method, which is a hybrid method of the quantum Monte Carlo method and variational Monte Carlo theory, to study the Hubbard model. The theory is based on the off-diagonal and the Gutzwiller type correlation factors which are taken into account by a Monte Carlo algorithm. In the 4x4 system our method is able to reproduce the exact results obtained by the diagonalization. An application is given to investigate the half-filled band case of two-dimensional square lattice. The energy is favorably compared with quantum Monte Carlo data.

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