Collective dynamics of internal states in a Bose gas

Details Collective dynamics of internal states in a Bose gas Collective dynamics of internal states in a Bose gas

2001-08-27

arxiv.org/abs/physics/0108052v1

Phys. Rev. A 65, 063604 (2002)

Physics

Atomic Physics

18 pages, 2 figures

Scientific paper

10.1103/PhysRevA.65.063604

Theory for the Rabi and internal Josephson effects in an interacting Bose gas in the cold collision regime is presented. By using microscopic transport equation for the density matrix the problem is mapped onto a problem of precession of two coupled classical spins. In the absence of an external excitation field our results agree with the theory for the density induced frequency shifts in atomic clocks. In the presence of the external field, the internal Josephson effect takes place in a condensed Bose gas as well as in a non-condensed gas. The crossover from Rabi oscillations to the Josephson oscillations as a function of interaction strength is studied in detail.

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