School of Physics - Research Publications

Permanent URI for this collection

http://hdl.handle.net/11343/309

Filters

2003 - 2005 4
4
Reset filters

Settings
Statistics
Citations
Subject: Condensed Matter Physics - Structural Properties ; Physical Sciences × Author: Parker, Nicholas ×

Search Results

Now showing 1 - 4 of 4
  • Item
    Thumbnail Image
    Soliton-Sound Interactions in Quasi-One-Dimensional Bose-Einstein Condensates
    PARKER, N ; Proukakis, NP ; Leadbeater, M ; Adams, CS ( 2003)
  • Item
    Thumbnail Image
    Parametric Driving of Dark Solitons in Atomic Bose-Einstein Condensates
    Proukakis, NP ; PARKER, N ; Barenghi, CF ; Adams, CS ( 2004)
  • Item
    Thumbnail Image
    Emergence and decay of turbulence in stirred atomic Bose-Einstein condensates.
    Parker, NG ; Adams, CS (American Physical Society (APS), 2005-09-30)
    We show that "weak" elliptical deformation of an atomic Bose-Einstein condensate rotating at close to the quadrupole instability frequency leads to turbulence with a Kolmogorov energy spectrum. The turbulent state is produced by energy transfer to condensate fragments that are ejected by the quadrupole instability. This energy transfer is driven by breaking the twofold rotational symmetry of the condensate. Subsequently, vortex-sound interactions damp the turbulent state leading to the crystallization of a vortex lattice.
  • Item
    Thumbnail Image
    Controlled vortex-sound interactions in atomic Bose-Einstein condensates.
    Parker, NG ; Proukakis, NP ; Barenghi, CF ; Adams, CS (American Physical Society (APS), 2004-04-23)
    The low temperature dynamics of a vortex in a trapped quasi-two-dimensional Bose-Einstein condensate are studied quantitatively. Precession of an off-centered vortex in a dimple trap, embedded in a weaker harmonic trap, leads to the emission of sound in a dipolar radiation pattern. Sound emission and reabsorption can be controlled by varying the depth of the dimple. In a shallow dimple, the power emitted is proportional to the vortex acceleration-squared over the precession frequency, whereas for a deep dimple, periodic sound reabsorption stabilizes the vortex against radiation-induced decay.