Phase ordering kinetics of the Bose gas

Details Phase ordering kinetics of the Bose gas Phase ordering kinetics of the Bose gas

1995-11-13

arxiv.org/abs/cond-mat/9511058v2

Phys.Rev. A54 (1996) 5037-5041

Physics

Condensed Matter

10 pages; revised presentation, but no additional results

Scientific paper

10.1103/PhysRevA.54.5037

We study the approach to equilibrium of a Bose gas to a superfluid state. We point out that dynamic scaling, characteristic of far from equilibrium phase-ordering systems, should hold. We stress the importance of a non-dissipative Josephson precession term in driving the system to a new universality class. A model of coarsening in dimension $d=2$, involving a quench between two temperatures below the equilibrium superfluid transition temperature ($T_c$), is exactly solved and demonstrates the relevance of the Josephson term. Numerical results on quenches from above $T_c$ in $d=2,3$ provide evidence for the scaling picture postulated.

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