title: Pomeranchuk cooling of SU(2N) ultracold fermions in optical lattices.
abstract: We investigate the thermodynamic properties of a half-filled SU(2N) Hubbard model in the two-dimensional square lattice by the method of the determinant quantum Monte Carlo simulation, which is free of the fermion "sign problem." The large number of hyperfine-spin components enhances spin fluctuations, which facilitates the Pomeranchuk cooling to temperatures comparable to the superexchange energy scale in the case of SU(6). Various physical quantities including entropy, charge fluctuations, and spin correlations are calculated.
authors.affiliation: Department of Physics, University of California, San Diego, California 92093, USA. Z.Cai@physik.lmu.de
authors.forename: Zi
authors.initials: Z
authors.lastname: Cai
authors.forename: Hsiang-hsuan
authors.initials: HH
authors.lastname: Hung
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Dong
authors.initials: D
authors.lastname: Zheng
authors.forename: Congjun
authors.initials: C
authors.lastname: Wu