Soliton localization in Bose-Einstein condensates with time-dependent harmonic potential and scattering length

We derive exact solitonic solutions of a class of Gross-Pitaevskii equations with a time-dependent harmonic trapping potential and interatomic interaction. We find families of exact single-solitonic, multi-solitonic and solitary wave solutions. We show that, with the special case of an oscillating trapping potential and interatomic interaction, a soliton can be localized indefinitely at an arbitrary position. The localization is shown to be experimentally possible for sufficiently long time even with only an oscillating trapping potential and a constant interatomic interaction.