Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-05-12
Phys. Rev. A 82, 053608 (2010)
Physics
Condensed Matter
Quantum Gases
Scientific paper
10.1103/PhysRevA.82.053608
Spin-changing collisions may lead under proper conditions to the parametric amplification of matter waves in spinor Bose-Einstein condensates. Magnetic dipole-dipole interactions, although typically very weak in alkaline atoms, are shown to play a very relevant role in the amplification process. We show that these interactions may lead to a strong dependence of the amplification dynamics on the angle between the trap axis and the magnetic-field orientation. We analyze as well the important role played by magnetic-field gradients, which modify also strongly the amplification process. Magnetic-field gradients must be hence carefully controlled in future experiments, in order to observe clearly the effects of the dipolar interactions in the amplification dynamics.
Arlt Jochen
Deuretzbacher Frank
Ertmer Wolfgang
Gebreyesus G.
Klempt Carsten
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