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European Quantum Electronics Conference (EQEC)

Soliton pendulum in a Bose-Einstein condensate of cold atoms in a parabolic trap

R. Bullough, N. M. Bogoliubov, Markus Lindberg, J.-P. Martikainen, Andrei V. Rybin, JUSSI TIMONEN

Published Aug 24, 2005• 0 citations
Publisher
DOI
10.1109/eqec.1998.714918

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We show that a vector matter–wave soliton in a Bose–Einstein condensate (BEC) loaded into an optical lattice can escape from a trap formed by a parabolic potential, resembling a Hawking emission. The particle–antiparticle pair is emulated by a low-amplitude bright–bright soliton in a two-component BEC with effective masses of opposite signs. It is shown that the parabolic potential leads to a spatial separation of BEC components. One component with chemical potential in a semi-infinite gap exerts periodical oscillations, while the other BEC component, with negative effective mass, escapes from the trap. The mechanism of atom transfer from one BEC component to another by spatially periodic linear coupling term is also discussed.