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Abstract: Cold fermionic atoms with three different hyperfine states withSU3 symmetry confined in one-dimensional optical lattices show color-chargeseparation, generalizing the conventional spin charge separation forinteracting SU2 fermions in one dimension. Through time-dependent DMRGsimulations, we explore the features of this phenomenon for a generalized SU3Hubbard Hamiltonian. In our numerical simulations of finite size systems, weobserve different velocities of the charge and color degrees of freedom when aGaussian wave packet or a charge color density response to a localperturbation is evolved. The differences between attractive and repulsiveinteractions are explored and we note that neither a small anisotropy of theinteraction, breaking the SU3 symmetry, nor the filling impedes the basicobservation of these effects.



Author: Tobias Ulbricht, Rafael A. Molina, Ronny Thomale, Peter Schmitteckert

Source: https://arxiv.org/







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