Signature of Mott-Insulator Transition with Ultracold Fermions in a One-Dimensional Optical Lattice
Signature of Mott-Insulator Transition with Ultracold Fermions in a One-Dimensional Optical Lattice
Using the exact Bethe ansatz solution of the Hubbard model and Luttinger liquid theory, we investigate the density profiles and collective modes of one-dimensional ultracold fermions confined in an optical lattice with a harmonic trapping potential. We determine a generic phase diagram in terms of a characteristic filling factor and …