Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-08-23
Phys. Rev. B 82, 245119 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 11 figures, minor changes
Scientific paper
10.1103/PhysRevB.82.245119
In a recent contribution [Phys. Rev. B 81, 165104 (2010)] fermionic Projected Entangled-Pair States (PEPS) were used to approximate the ground state of free and interacting spinless fermion models, as well as the $t$-$J$ model. This paper revisits these three models in the presence of an additional next-nearest hopping amplitude in the Hamiltonian. First we explain how to account for next-nearest neighbor Hamiltonian terms in the context of fermionic PEPS algorithms based on simulating time evolution. Then we present benchmark calculations for the three models of fermions, and compare our results against analytical, mean-field, and variational Monte Carlo results, respectively. Consistent with previous computations restricted to nearest-neighbor Hamiltonians, we systematically obtain more accurate (or better converged) results for gapped phases than for gapless ones.
Corboz Philippe
Jordan Jacob
Vidal Guifre
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