Bright solitons and soliton trains in a fermion-fermion mixture

Details Bright solitons and soliton trains in a fermion-fermion mixture Bright solitons and soliton trains in a fermion-fermion mixture

2007-02-07

arxiv.org/abs/cond-mat/0702175v1

Eur. Phys. J. D 40 (2006) 157-160

Physics

Condensed Matter

Other Condensed Matter

5 pages, 7 figures

Scientific paper

10.1140/epjd/e2006-00203-3

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.

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