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We consider the motion of a matter-wave bright soliton under the influence
of a cloud of thermal particles. In the ideal one-dimensional system, the
scattering process of the quasiparticles with the soliton is
reflectionless, however, the quasiparticles acquire a phase shift. In the
realistic system of a Bose-Einstein condensate confined in a tight
waveguide trap, the transverse degrees of freedom generate an extra but
small nonlinearity in the system which gives rise to finite reflection and
leads to dissipative motion of the soliton. We calculate the velocity and
temperature-dependent frictional force and diffusion coefficient of a
matter wave bright soliton immersed in a thermal cloud.
Related references: S. Sinha, A. Yu. Cherny, D. Kovrizhin, and J. Brand Friction and diffusion of matter-wave bright solitons cond-mat/0506060 (submitted to Phys. Rev. Lett.) Ch. Lee and J. Brand Enhanced quantum reflection of matter-wave solitons cond-mat/0505697 (submitted to Europhys. Lett.) S. Komineas and J. Brand, Phys. Rev. Lett. 95, 110401 (2005) N. S. Ginsberg, J. Brand, and L. V. Hau, Phys. Rev. Lett. 94, 040403 (2005) |
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