Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 10: Ultra-cold atoms, ions and BEC II (with Q)
A 10.9: Vortrag
Dienstag, 15. März 2011, 12:30–12:45, BAR 106
Propagation of a wave-packet in a nonlinear and disordered medium in two dimensions — •Georg Schwiete1 and Alexander Finkelstein2 — 1Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, Germany — 2Texas A&M University, College Station, USA
We develop an effective theory of wave-packet propagation in a nonlinear and disordered medium. The theory is formulated in terms of a nonlinear diffusion equation. Despite its apparent simplicity this equation describes novel phenomena which we refer to as "locked explosion" and "diffusive" collapse. The equation can be applied to such distinct physical systems as laser beams propagating in disordered photonic crystals or Bose-Einstein condensates expanding in a disordered environment.