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A: Fachverband Atomphysik

A 27: Ultra-Cold Atoms, Ions and BEC IV / Interaction with VUV and X-Ray Light II (with Q)

A 27.4: Vortrag

Freitag, 12. März 2010, 14:45–15:00, F 303

One-dimensional Anderson localization in correlated random potentials — •Pierre Lugan¹, Alain Aspect¹, Laurent Sanchez-Palencia¹, Dominique Delande², Benoit Grémaud^2,3, Cord A. Müller^2,4, and Christian Miniatura^3,5 — ¹Laboratoire Charles Fabry de l'Institut d'Optique, CNRS and Univ. Paris-Sud, Campus Polytechnique, RD 128, F-91127 Palaiseau Cedex, France — ²Laboratoire Kastler-Brossel, UPMC, ENS, CNRS, 4 Place Jussieu, F-75005 Paris, France — ³Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore — ⁴Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany — ⁵Institut Non Linéaire de Nice, UNS, CNRS, 1361 Route des Lucioles, F-06560 Valbonne, France

The study of disorder with ultracold atomic gases has recently attracted much attention due to the possibility of controlling disorder, interactions, and dimensionality in these systems. In this contribution, we study the Anderson localization of ultracold atoms in weak, correlated one-dimensional potentials, and we discuss how the special long-range correlations present in the speckle potentials used in current experiments affect the localization properties of single particles and non-interacting wave packets. It is known that in one dimension generally all single-particle states are localized. For weak speckle potentials, we show the existence of a series of sharp cross-overs (effective mobility edges) between regions of the single-particle energy spectrum where the localization lengths differ by orders of magnitude [1].

[1] P. Lugan et al., Phys. Rev. A 80, 023605 (2009).