Stability and dynamics of two-soliton molecules

Details Stability and dynamics of two-soliton molecules Stability and dynamics of two-soliton molecules

2010-04-18

arxiv.org/abs/1004.3000v3

Physics

Condensed Matter

Quantum Gases

Phys. Rev. E 81, 056603 (2010). [corrected figures layout]

Scientific paper

The problem of soliton-soliton force is revisited. From the exact two solitons solution of a nonautonomous Gross-Pitaevskii equation, we derive a generalized formula for the mutual force between two solitons. The force is given for arbitrary solitons amplitude difference, relative speed, phase, and separation. The latter allows for the investigation of soliton molecules formation, dynamics, and stability. We reveal the role of the time-dependent relative phase between the solitons in binding them in a soliton molecule. We derive its equilibrium bond length, spring constant, frequency, effective mass, and binding energy of the molecule. We investigate the molecule's stability against perturbations such as reflection from surfaces, scattering by barriers, and collisions with other solitons.

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