We introduce an efficient way to improve the accuracy of projected wave functions, widely used to study the two-dimensional Hubbard model. Taking the clue from the backflow contribution, whose relevance has been emphasized for various interacting systems on the continuum, we consider many-body correlations to construct a suitable approximation for the ground state at intermediate and strong couplings. In particular, we study the phase diagram of the frustrated t-t(') Hubbard model on the square lattice and show that, thanks to backflow correlations, an insulating and nonmagnetic phase can be stabilized at strong coupling and sufficiently large frustrating ratio t(')/t.
|Titolo:||Role of backflow correlations for the nonmagnetic phase of the t-t' Hubbard model|
|Autori:||Tocchio L; Becca F; Parola A; Sorella S|
|Rivista:||PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS|
|Data di pubblicazione:||2008|
|Digital Object Identifier (DOI):||10.1103/PhysRevB.78.041101|
|Appare nelle tipologie:||1.1 Journal article|