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Phys. Rev. B 73, 165120 (2006) [13 pages]

Bethe ansatz density-functional theory of ultracold repulsive fermions in one-dimensional optical lattices

Gao Xianlong, Marco Polini, and M. P. Tosi
NEST-CNR-INFM and Scuola Normale Superiore, I-56126 Pisa, Italy

Vivaldo L. Campo, Jr.
Centro Internacional de Física de Matéria Condensada, Universidade de Brasília, Caixa Postal 04513, 70919-970 Brasília, Brazil

Klaus Capelle
Departamento de Física e Informática, Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, São Paulo, Brazil

Marcos Rigol
Physics 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

URL: http://link.aps.org/doi/10.1103/PhysRevB.73.165120
DOI: 10.1103/PhysRevB.73.165120
PACS: 71.15.Mb; 03.75.Ss; 03.75.Lm; 71.10.Pm
  • 71.15.Mb
    Density functional theory, local density approximation, gradient and other corrections (condensed matter electronic structure)
  • 03.75.Ss
    Degenerate Fermi gases
  • 03.75.Lm
    Josephson effect, tunneling, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations
  • 71.10.Pm
    Fermions in reduced dimensions (condensed matter) including anyons, composite fermions, Luttinger liquid, etc
  • YEAR: 2006
KEYWORDS: strongly correlated electron systems, ground states, density functional theory, Monte Carlo methods, Luttinger liquid, localised states, Thomas-Fermi model, total energy

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