期刊
PHYSICAL REVIEW B
卷 84, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.241110
关键词
-
资金
- PRACE [2010PA0447]
We introduce a method that combines the power of both the lattice Green' function Monte Carlo (LGFMC) with the auxiliary field quantum Monte Carlo (AFQMC) techniques, and allows us to compute exact ground-state properties of the Hubbard model for U less than or similar to 4t on finite clusters. Thanks to LGFMC, one obtains unbiased zero temperature results, not affected by the so-called Trotter approximation of the imaginary time propagator e(-H tau). At the same time, the AFQMC formalism yields a remarkably fast convergence in tau before the fermion sign problem becomes prohibitive. As an application we report ground-state energies of the Hubbard model at U/t = 4 with up to 100 sites.
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