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Color-charge separation in trapped SU(3) fermionic atoms

AuthorsUlbricht, Tobias; Molina, Rafael A. ; Thomale, Ronny; Schmitteckert, Peter
Issue Date2010
PublisherAmerican Physical Society
CitationPhysical Review A 82 (2010)
AbstractCold fermionic atoms with three different hyperfine states with SU(3) symmetry confined in one-dimensional optical lattices show color-charge separation, generalizing the conventional spin-charge separation for interacting SU(2) fermions in one dimension. Through time-dependent density-matrix renormalization-group simulations, we explore the features of this phenomenon for a generalized SU(3) Hubbard Hamiltonian. In our numerical simulations of finite-size systems, we observe different velocities of the charge and color degrees of freedom when a Gaussian wave packet or a charge (color) density response to a local perturbation is evolved. The differences between attractive and repulsive interactions are explored and we note that neither a small anisotropy of the interaction, breaking the SU(3) symmetry, nor the filling impedes the basic observation of these effects. © 2010 The American Physical Society.
Identifiersdoi: 10.1103/PhysRevA.82.011603
issn: 1050-2947
Appears in Collections:(CFMAC-IEM) Artículos
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