Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 17: Ultra-Cold Atoms, Ions and BEC III (with Q)
A 17.8: Vortrag
Donnerstag, 11. März 2010, 12:15–12:30, F 303
Study of matter-wave speckle patterns — •Nicolas Cherroret1 and Sergey Skipetrov2 — 1Quantum optics and statistics group, Institute of Physics, Albert Ludwigs University of Freiburg, Germany — 2Laboratoire de Physique et Modélisation des Milieux Condensés, Grenoble, France
The behavior of Bose-Einstein Condensates (BECs) in disordered potentials attracts growing interest of physicists during the last few years. More specifically, the properties of a BEC released from a trap in a random potential has been studied. From the experimental viewpoint, BEC systems are very controllable and versatile, and direct measurements of the atomic spatial density n(r) can be performed. During the last two years, considerable efforts were made to study the ensemble average of n(r) in 1D, 2D, and 3D systems, with special interest in the phenomenon of Anderson localization. In the same time, very few results concern the statistics of n. However, it is well known that a wave propagating in a disordered medium generates a complicated intensity pattern (``speckle") due to multiple scattering from inhomogeneities. Since a weakly interacting BEC can be regarded as a coherent matter wave, an analogous phenomenon should also show up in the case of BECs. We analyze these ``matter-wave speckle patterns" theoretically and show that they exhibit long-range density correlations, strongly enhanced at long times, which can even take negative values for sufficiently distant points.
Reference: N. Cherroret and S.E. Skipetrov, Phys. Rev. Lett. 101, 190406 (2008)