Vortex-lattice formation and melting in a nonrotating Bose-Einstein condensate
Gary Ruben, David M. Paganin, and Michael J. Morgan (School of, Physics, Monash University)
TL;DR
This paper uses numerical simulations to study vortex lattice formation and melting in a nonrotating Bose-Einstein condensate, revealing a linear interference mechanism for vortex creation and complex vortex-antivortex dynamics.
Contribution
It demonstrates that vortex lattice formation in a nonrotating BEC primarily results from linear wave interference, contrasting with nonlinear vortex generation mechanisms.
Findings
Honeycomb vortex lattice observed in simulations
Lattice melts within a trap, showing vortex-antivortex interactions
Vortex creation explained by linear superposition theory
Abstract
Numerical simulations of the interference of a three-way segmented nonrotating Bose-Einstein condensate reveal the production of a honeycomb vortex lattice containing significant numbers of vortices and antivortices. If confined within a trap, the lattice subsequently melts, exhibiting a rich assortment of vortex-antivortex interactions. In contrast with nonlinear vortex production mechanisms previously described for Bose-Einstein condensates, the process here is shown to be primarily one of linear superposition, with initial vortex locations approximately described by a linear theory of wave packet interference.
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