# Dresden 2011 – wissenschaftliches Programm

## Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

# 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 Schwiete^{1} and Alexander Finkelstein^{2} — ^{1}Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, Germany — ^{2}Texas 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.