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Chinese Physics Letters

Laser-Catalyzed Domain Formation in Spinor-1 Bose Condensates

Ya-Jing Jiang, Jingxin Sun, Hui Jing

Published Nov 1, 2012• 0 citations
Publisher

Abstract

We show theoretically that it is possible to optically control domain formation in a spinor-1 87 Rb gas. A model is proposed to include the photoassociation (PA) interaction characterizing the symmetry breaking of M F = ±1 ferromagnetic condensate. We find that the dynamical process of the domain formation can be greatly controlled by the PA field. The PA field can enhance or suppress the spatial separation of domains, which can provide a flexible tool to modulate the domain structure and indicate an interesting research field of laser-catalyzed in spinor condensate.

DOI
10.1088/0256-307x/29/11/110303

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We show theoretically that it is possible to optically control domain formation in a spinor-1 87 Rb gas. A model is proposed to include the photoassociation (PA) interaction characterizing the symmetry breaking of M F = ±1 ferromagnetic condensate. We find that the dynamical process of the domain formation can be greatly controlled by the PA field. The PA field can enhance or suppress the spatial separation of domains, which can provide a flexible tool to modulate the domain structure and indicate an interesting research field of laser-catalyzed in spinor condensate.
We study the coherent spin-mixing dynamics in a spin-1 atomic condensate coupled with a molecular condensate. A model is proposed to include the photoassociation (PA) interaction in a spinor condensate. If only the ${m}_{F}=\ensuremath{-}1$ spin component can be converted into molecules, the combined dynamics of spin-mixing and PA can be described by nonlinearly coupled pendulums. We performed detailed numerical calculations on the antiferromagnetic spin-1 systems. We find the spin-mixing dynamics can be greatly controlled by the PA field. The PA field can enhance or suppress the period and amplitude of the spin oscillations, which provide more degrees of freedom to control the spin-mixing dynamics.
We present a theory to describe domain formation observed very recently in a quenched 87Rb gas, a typical ferromagnetic spinor Bose system. An overlap factor is introduced to characterize the symmetry breaking of MF=+/-1 components for the F=1 ferromagnetic condensate. We demonstrate that the domain formation is a coeffect of the quantum coherence and the thermal relaxation. A thermally enhanced quantum oscillation is observed during the dynamical process of the domain formation. And the spatial separation of domains leads to significant decay of the MF=0 component fraction in an initial MF=0 condensate.
We have performed a two-photon photoassociation experiment in an atomic Bose-Einstein condensate of 87 Rb with the spin degree of freedom, which is created by an all-optical method with CO 2 lasers. The spinor character of the created molecules has been revealed by the photoassociation spectrum with a new structure. The hyperfine structure of the created molecules near the dissociation limit is identified by observations of the Zeeman and AC-Stark effects of the molecules. We have also demonstrated the spin-selective creation of molecules. This result would open the new possibility of research on novel molecular spinor BEC.
We consider a ferromagnetic spin-1 Bose-Einstein condensate (BEC) dispersively coupled to a unidirectional ring cavity. We show that the ability of the cavity to modify, in a highly nonlinear fashion, matter-wave phase shifts adds an additional dimension to the study of spinor condensates. In addition to demonstrating strong matter-wave bistability as in our earlier publication [L. Zhou et al., Phys. Rev. Lett. 103, 160403 (2009)], we show that the interplay between atomic and cavity fields can greatly enrich both the physics of critical slowing down in spin-mixing dynamics and the physics of spin-domain formation in spinor condensates.