Different growth rates for spin and superfluid order in a quenched spinor condensate

Abstract

In this paper we study the coarsening dynamics of a spinor condensate quenched into an easy-axis ferromagnetic phase by a sudden change in the quadratic Zeeman energy. We show that applying a spin rotation prior to changing the Zeeman energy accelerates the development of local order and reduces heating. We examine the longitudinal spin ordering and the superfluid ordering of the system and show that the respective order parameter correlation functions exhibit dynamic scaling in the late time dynamics. Our results also demonstrate that these two types of order grow at different rates, i.e.~with different dynamic critical exponents. The spin domain area distribution is calculated and is shown to have power law scaling behavior expected from percolation theory.

9 pages, 7 figures

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• Excitations and phase ordering of the spin-stripe phase of a binary dipolar condensate
• Core structure of static ferrodark solitons in a spin-1 Bose-Einstein condensate
• Stochastic Gross-Pitaevskii theory for a spin-1 Bose gas: Application to superfluidity in two dimensions
• Collective excitations and universal coarsening dynamics of a spin-orbit-coupled spin-1 Bose-Einstein condensate
• On internal structure of smaller domains in domain coarsening dynamics of spontaneous Z_2-symmetry breaking in two dimensions
• Anomalous non-thermal fixed point in a quasi-two-dimensional dipolar Bose gas