Bright solitons and soliton trains in a fermion-fermion mixture
Instituto de Física Teórica, UNESP - São Paulo State University, 01., 405-900 São Paulo, SP, Brazil
Corresponding author: a firstname.lastname@example.org
Revised: 14 July 2006
Published online: 8 September 2006
We use a time-dependent dynamical mean-field-hydrodynamic model to predict and study bright solitons in a degenerate fermion-fermion mixture in a quasi-one-dimensional cigar-shaped geometry using variational and numerical methods. Due to a strong Pauli-blocking repulsion among identical spin-polarized fermions at short distances there cannot be bright solitons for repulsive interspecies fermion-fermion interactions. However, stable bright solitons can be formed for a sufficiently attractive interspecies interaction. We perform a numerical stability analysis of these solitons and also demonstrate the formation of soliton trains. These fermionic solitons can be formed and studied in laboratory with present technology.
PACS: 03.75.Ss – Degenerate Fermi gases / 05.45.Yv – Solitons
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006