Eur. Phys. J. D 40, 157-160 (2006)
https://doi.org/10.1140/epjd/e2006-00203-3

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 adhikari@ift.unesp.br

Received: 25 April 2006
Revised: 14 July 2006
Published online: 8 September 2006

Abstract

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.