Phys. Rev. B 73, 165120 (2006) [13 pages]
Bethe ansatz density-functional theory of ultracold repulsive fermions in one-dimensional optical lattices
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Citing Articles
Gao Xianlong, Marco Polini, and M. P. TosiNEST-CNR-INFM and Scuola Normale Superiore, I-56126 Pisa, ItalyVivaldo L. Campo, Jr.Centro Internacional de Física de Matéria Condensada, Universidade de Brasília, Caixa Postal 04513, 70919-970 Brasília, BrazilKlaus CapelleDepartamento de Física e Informática, Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, São Paulo, BrazilMarcos RigolPhysics Department, University of California, Davis, California 95616, USA and Institut für Theoretische Physik III, Universität Stuttgart, 70550 Stuttgart, Germany
Received 8 December 2005; published 21 April 2006
We present an extensive numerical study of the ground-state properties of confined repulsively interacting fermions in one-dimensional optical lattices. Detailed predictions for the atom-density profiles are obtained from parallel Kohn-Sham density-functional calculations and quantum Monte Carlo simulations. The density-functional calculations employ a Bethe ansatz based local-density approximation for the correlation energy that accounts for Luttinger-liquid and Mott-insulator physics. Semianalytical and fully numerical formulations of this approximation are compared with each other and with a cruder Thomas-Fermi-type local-density approximation for the total energy. Precise quantum Monte Carlo simulations are used to assess the reliability of the various local-density approximations, and in conjunction with these provide a detailed microscopic picture of the consequences of the interplay between particle-particle interactions and confinement in one-dimensional systems of strongly correlated fermions.
©2006 The American Physical Society
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