Two-dimensional Bose-Einstein Condensate under extreme rotation

S. Sinha (1) , G. V. Shlyapnikov (2, 3)

1 MPI-PKS - Max-Planck-Institut für Physik komplexer Systeme
2 LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques
3 Van der Waals-Zeeman Institute

We show that a Bose-condensed gas under extreme rotation in a 2D anisotropic trap, forms a novel elongated quantum fluid which has a roton-maxon excitation spectrum. For a sufficiently large interaction strength, the roton energy reaches zero and the system undergoes a second order quantum transition to the state with a periodic structure - rows of vortices. The number of rows increases with the interaction, and the vortices eventually form a triangular Abrikosov lattice.

Domaines: Mécanique statistique [cond-mat.stat-mech]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

S. Sinha, G. V. Shlyapnikov. Two-dimensional Bose-Einstein Condensate under extreme rotation. Physical Review Letters, 2005, 94, pp.150401. ⟨hal-00004895⟩