Numerical linked-cluster algorithms. II. t-J models on the square lattice

TitleNumerical linked-cluster algorithms. II. t-J models on the square lattice
Publication TypeJournal Article
Year of Publication2007
AuthorsRigol, M., Bryant T., and Singh R. R. P.
JournalPhysical Review E
Volume75
Pagination061119
Abstract

We discuss the application of a recently introduced numerical linked-cluster (NLC) algorithm to strongly correlated itinerant models. In particular, we present a study of thermodynamic observables: chemical potential, entropy, specific heat, and uniform susceptibility for the t-J model on the square lattice, with J/t=0.5 and 0.3. Our NLC results are compared with those obtained from high-temperature expansions (HTE) and the finite-temperature Lanczos method (FTLM). We show that there is a sizeable window in temperature where NLC results converge without extrapolations whereas HTE diverges. Upon extrapolations, the overall agreement between NLC, HTE, and FTLM is excellent in some cases down to 0.25t. At intermediate temperatures NLC results are better controlled than other methods, making it easier to judge the convergence and numerical accuracy of the method.

URLhttp://link.aps.org/doi/10.1103/PhysRevE.75.061119
DOI10.1103/PhysRevE.75.061119
arXiv.org

arXiv:0706.3255