par Goldman, Nathan
Référence Physical Review A, 77, page (053406)
Publication Publié, 2008
Article révisé par les pairs
Résumé : In this work we study ultracold fermions confined in a two-dimensional optical lattice and we explore the Mott-insulator transition with the Fermi-Hubbard model. On the basis of a mean-field approach, we study the phase diagrams in the presence of a harmonic trapping potential. Local Mott-insulator phases are shown to be generally situated in the center of the trap and correspond to a vanishing variance of the local density. We then study the effects induced by rotation on the Mott-insulator phase transition. In particular, we show that the phase boundary reproduces the edge of the Hofstadter butterfly. © 2008 The American Physical Society.