Düsseldorf 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 64: Poster Quantengase
Q 64.25: Poster
Donnerstag, 22. März 2007, 16:30–18:30, Poster C
Time Evolution of a Tonks Gas in Disorder — Birger Horstmann1,2, •Tommaso Roscilde1, and Ignacio Cirac1 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany — 2Institut für Theoretische Physik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany
Waves propagating in static disorder can become localized in a finite region of space, even for energies for which classical motion is not bounded, a phenomenon known as Anderson localization. There have been proposals and experimental attempts to observe Anderson localization in Bose-Einstein Condensates and optical lattices. In these experiments, where disorder was introduced by using laser speckles, non-classical localization by coherent backscattering could not be achieved due to the large length scale of the disorder.
We analyse a system of cold atoms in an optical lattice in presence of disorder created by the interaction with a different immobile/frozen species of atoms. Two distinguishable species of atoms in optical lattices can be realized by addressing two different internal states of the atoms. The atoms are prepared in a Tonks Gas, i.e. a one dimensional system of hard core bosons, that has been realized in experiment and can easily be treated numerically.
We find that an initially localized wavepaket remains localized during time evolution for any value of the interaction strength between the two species and that the quasi-condensation in a Tonks Gas without disorder disappears in the presence of disorder.