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      Stable condensate of singlet pairs in spinor Bose gases

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          Abstract

          Spin-1 Bose gas with anti-ferromagnetic interactions can form a Bose condensate of singlet pairs (singlet molecules) at low concentrations of atoms. We show that despite the effective attractive inter-atomic interactions in spin-singlet channel, the molecular condensate can be stabilized against further collapse due to the repulsive interactions in the spin-2 channel, and determine the region of stability of the singlet condensate. Our results provide an example of stabilization of the Bose-condensed phase by competing attractive and repulsive interactions.

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          Most cited references9

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          Spinor Bose Condensates in Optical Traps

          Tin-Lun Ho (1998)
          In an optical trap, the ground state of spin-1 Bosons such as \(^{23}\)Na, \(^{39}\)K, and \(^{87}\)Rb can be either a ferromagnetic or a "polar" state, depending on the scattering lengths in different angular momentum channel. The collective modes of these states have very different spin character and spatial distributions. While ordinary vortices are stable in the polar state, only those with unit circulation are stable in the ferromagnetic state. The ferromagnetic state also has coreless (or Skyrmion) vortices like those of superfluid \(^{3}\)He-A. Current estimates of scattering lengths suggest that the ground states of \(^{23}\)Na and \(^{87}\)Rb condensate are a polar state and a ferromagnetic state respectively.
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            Spinor Bose gases: Symmetries, magnetism, and quantum dynamics

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              Semianalytic theory of laser-assisted resonant cold collisions

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                Author and article information

                Journal
                2017-06-25
                Article
                1706.08085
                922f4c7d-df0e-4448-9e2c-021351b1ea61

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                5 pages, 1 Figure + Supplement
                cond-mat.quant-gas

                Quantum gases & Cold atoms
                Quantum gases & Cold atoms

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