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From superradiant Rayleigh scattering to Bragg scattering
INFM and European Laboratory for Non-Linear Spectroscopy (LENS), via N. Carrara 1, 50019 Sesto F.no (FI), Italy, Dipartimento di Fisica, Università di Firenze, via Sansone 1, 50019 Sesto F.no (FI), Italy.
Umeå University, Faculty of Science and Technology, Physics.
INFM and European Laboratory for Non-Linear Spectroscopy (LENS), via N. Carrara 1, 50019 Sesto F.no (FI), Italy, Dipartimento di Fisica, Università di Firenze, via Sansone 1, 50019 Sesto F.no (FI), Italy.
INFM and European Laboratory for Non-Linear Spectroscopy (LENS), via N. Carrara 1, 50019 Sesto F.no (FI), Italy, Dipartimento di Fisica, Università di Catania, via S. Sofia 64, 95124 Catania, Italy.
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2005 (English)In: European Physical Journal D: Atomic, Molecular and Optical Physics, ISSN 1434-6060, E-ISSN 1434-6079, Vol. 32, no 2, 167-170 p.Article in journal (Refereed) Published
Abstract [en]

We present the results of an experiment on light scattering from an elongated Bose-Einstein condensate interacting with far off resonant laser light. Due to superradiant Rayleigh scattering a coherent superposition of two atomic wavepackets with different momenta forms in the presence of a single laser beam. Varying the intensity of a weak counterpropagating laser beam we observe the transition from the pure superradiant regime to the Bragg scattering regime, where Rabi oscillations in a two-level system are observed. The process is limited by the decoherence between the two atomic wavepackets.

Place, publisher, year, edition, pages
2005. Vol. 32, no 2, 167-170 p.
Identifiers
URN: urn:nbn:se:umu:diva-3433DOI: 10.1140/epjd/e2004-00124-1OAI: oai:DiVA.org:umu-3433DiVA: diva2:142119
Available from: 2008-09-12 Created: 2008-09-12 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Ultracold rubidium atoms in periodic potentials
Open this publication in new window or tab >>Ultracold rubidium atoms in periodic potentials
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis includes both experimental and theoretical investigations, presented in a series of eight papers. The experimental part ranges from the construction procedures of an apparatus for Bose-Einstein condensates, to full scale experiments using three different set-ups for ultracold atoms in optical lattices. As one of the main themes of the thesis, an experimental apparatus for production of Bose-Einstein Condensates is under construction. A magneto-optically trapped sample, hosting more than 200 million 87Rb atoms, have successfully been loaded into a magnetic trap with high transfer rate. The lifetime of the sample in the magnetic trap is in the range of 9 s, and the atoms have been shown to respond to evaporative cooling. The experiment is ready for optimization of the magnetic trap loading, and evaporative cooling parameters, which are the final steps for reaching Bose-Einstein condensation. The set-up is designed to host experiments including variable geometry optical lattices, and includes the possibility to align laser beams with high angular precision for this purpose. The breakdown of Bloch waves in a Bose-Einstein condensate is studied, attributed to the effect of energetic and dynamical instability. This experimental study is performed using a Bose-Einstein condensate in a moving one-dimensional optical lattice at LENS, Florence Italy. The optical lattice parameters, and the thermal distribution of the atomic sample required to trigger the instabilities, are detected, and compared with a theoretical model developed in parallel with the experiments. In close connection with these one-dimensional lattice studies, an experimental survey to characterize regimes of superradiant Rayleigh scattering and Bragg scattering is presented. Tunneling properties of repulsively bound atom pairs in double well potentials are characterized in an experiment at Johannes Gutenberg University, Mainz Germany. A three-dimensional optical lattice, producing an array of double wells with tunable properties is let to interact with a Bose-Einstein condensate. Pairs of ultracold atoms are produced on one side in the double wells, and their tunneling behavior, dependent on potential barrier and repulsion properties, is studied. A theoretical study of the crossover between one- and two-dimensional systems has been performed. The simulations were made for a two-dimensional array of atoms, where the behavior for different tunneling probabilities and atom-atom repulsion strengths was studied. Scaling relations for systems of variable sizes have been examined in detail, and numerical values for the involved variables have been found.

Place, publisher, year, edition, pages
Umeå: Fysik, 2008. 105 p.
Keyword
Bose-Einstein condensation, optical lattice, quantum phase transition, experiment, theory
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:umu:diva-1821 (URN)978-91-7264-628-5 (ISBN)
Public defence
2008-10-03, N200, Naturvetarhuset, Umeå Universitet, Umeå, 10:15 (English)
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Available from: 2008-09-12 Created: 2008-09-11 Last updated: 2009-06-30Bibliographically approved

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Publisher's full texthttp://dx.doi.org/10.1140/epjd/e2004-00124-1

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