Nonequilibrium Effects of Anisotropic Compression Applied to Vortex Lattices in Bose-Einstein Condensates
P Engels, Ian R. Coddington, P C. Haljan, Eric A. Cornell
We have studied the dynamics of large vortex lattices in a dilute-gas Bose-Einstein condensate. While undisturbed lattices have a regularhexagonal structure, large-amplitude quadrupolar shape oscillations of the condensate are shown to induce a wealth of nonequilibrium latticedynamics. When exciting an m -- -2 mode, we observe shifting of lattice planes, changes of lattice structure, and sheet-like structures in whichindividual vortices appear to have merged. Excitation of an m = +2 mode dissolves the regular lattice, leading to randomly arranged but stillstrictly parallel vortex lines.
, Coddington, I.
, Haljan, P.
and Cornell, E.
Nonequilibrium Effects of Anisotropic Compression Applied to Vortex Lattices in Bose-Einstein Condensates, Physical Review Letters
(Accessed June 7, 2023)