Quantum Noise, Scaling and Domain Formation in a Spinor BEC

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dc.creatorMias, George I.
dc.creatorCooper, Nigel R.
dc.creatorGirvin, S. M.
dc.date2007-10-18
dc.date2007-11-12
dc.date.accessioned2026-07-07T09:20:23Z
dc.date.available2026-07-07T09:20:23Z
dc.descriptionIn 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.
dc.descriptionRevtex4: 14 pages, 10 figures. Updated version submitted to PRA with corrected typos and references. Higher resolution version available upon request
dc.identifierhttps://arxiv.org/abs/0710.3547
dc.identifierhttp://arxiv.org/abs/0710.3547
dc.identifierPhys. Rev. A77, 023616 (2008)
dc.identifierdoi:10.1103/PhysRevA.77.023616
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/154704
dc.subjectStatistical Mechanics
dc.subjectQuantum Physics
dc.titleQuantum Noise, Scaling and Domain Formation in a Spinor BEC
dc.typetext

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