Quantum Noise, Scaling and Domain Formation in a Spinor BEC

Details Quantum Noise, Scaling and Domain Formation in a Spinor BEC Quantum Noise, Scaling and Domain Formation in a Spinor BEC

2007-10-18

arxiv.org/abs/0710.3547v2

Phys. Rev. A77, 023616 (2008)

Physics

Condensed Matter

Statistical Mechanics

Revtex4: 14 pages, 10 figures. Updated version submitted to PRA with corrected typos and references. Higher resolution version

Scientific paper

10.1103/PhysRevA.77.023616

In this paper we discuss Bose-Einstein spinor condensates for F=1 atoms in the context of 87Rb, as studied experimentally by the Stamper-Kurn group [Sadler et al. Nature (2006)]. The dynamical quantum fluctuations of a sample that starts as a condensate of N atoms in a pure F=1, m_F = 0 state are described in analogy to the `two-mode squeezing' of quantum optics in terms of an su(1,1) algebra. In this system the initial m_F=0 condensate acts as a source (`pump') for the creation pairs of m_F =+1,-1 atoms. We show that even though the system as a whole is described by a pure state with zero entropy, the reduced density matrix for the m_F = +1 degree of freedom, obtained by tracing out the m_F = -1,0 degrees of freedom, corresponds to a thermal state. Furthermore, these quantum fluctuations of the initial dynamics of the system provide the seeds for the formation of domains of ferromagnetically aligned spins.

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