Two-dimensional Bose-Einstein Condensate under extreme rotation

S. Sinha 1, G. V. Shlyapnikov 2, 3

Physical Review Letters 94 (2005) 150401

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.

  • 1. Max-Planck-Institut für Physik komplexer Systeme,
  • 2. Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS),
    CNRS : UMR8626 – Université Paris XI - Paris Sud
  • 3. Van der Waals-Zeeman Institute,
    University of Amsterdam