Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.46: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Experimental investigation of momentum space signatures of Anderson localization — •Valentin V. Volchkov¹, Jérémie Richard¹, Vincent Denechaud¹, Guillaume Berthet¹, Kilian Müller¹, Philippe Bouyer², Alain Aspect¹, and Vincent Josse¹ — ¹Laboratoire Charles Fabry UMR 8501, Institut d’Optique, CNRS, Univ Paris Sud 11, 2 Avenue Augustin Fresnel, 91127 Palaiseau cedex, France — ²LP2N UMR 5298, Univ Bordeaux 1, Institut d’Optique and CNRS, 351 cours de la Libération, 33405 Talence, France.

Phase coherence has dramatic effects on the transport properties of waves in random media, leading eventually to a complete halt of the wave, i.e. Anderson localization. Recently, new ideas have emerged, as for instance the search for original signatures of Anderson localization in momentum space. We present our investigations along that line using ultracold atoms in a laser speckle potential. On the one hand, the observed Coherent Backscattering with ultracold atoms constitutes the first direct signature of phase coherence in ultracold disordered gases [1]. For strong disorder, on the other hand, a "Coherent Forward Scattering" (CFS) has been theoretically predicted [2] and could be used to give unambiguous signature of the onset of Anderson localization. We implement the proposal by Lee et al [3] to observe CFS in 1D by launching an atomic wavepacket into a highly anisotropic disorder potential. Preliminary results are discussed.

[1]: F. Jendrzejewski et al., PRL 109, 195302 (2012). [2]: T. Karpiuk et al., PRL 109, 190601 (2012). [3]: K. L. Lee et al., PRA 90, 043605 (2014).