Magnetic Dipolar Interaction in a Bose-Einstein Condensate Atomic Interferometer

Year: 2008

Authors: Fattori M., Roati G., Deissler B., D’Errico C., Zaccanti M., Jona-Lasinio M., Santos L., Inguscio M., Modugno G.

Autors Affiliation: LENS and Dipartimento di Fisica, Università di Firenze, and INFM-CNR, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy;
Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi,” Compendio del Viminale, 00184 Roma, Italy;
INFN, Sezione di Firenze, Via Sansone 1, 50019 Sesto Fiorentino, Italy;
Institut für Theoretische Physik, Leibniz Universität, D-30167 Hannover, Germany

Abstract: We study the role played by the magnetic dipole interaction in the decoherence of a lattice-based interferometer that employs an alkali Bose-Einstein condensate with a tunable scattering length. The different behavior we observe for two different orientations of the dipoles gives us evidence of the anisotropic character of the interaction. The experiment is correctly reproduced by a model we develop only if the long-range interaction between different lattice sites is taken into account. Our model indicates that dipolar interaction can be compensated by a proper choice of the scattering length and that the magnetic dipole interaction should not represent an obstacle for atom interferometry with Bose-Einstein condensates with a tunable interaction.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 101 (19)      Pages from: 190405  to: 190405

More Information: We acknowledge discussions with A. Simoni, M. Modugno, and the rest of the quantum gases group at LENS. This work was supported by MIUR (PRIN 2006), by EU (MEIF-CT-2004-009939), by INFN, by ESF through the EUROQUASAR program (QuDeGPM project), by DFG (SPP1116, SFB407), and by Ente CRF, Firenze. B. D. acknowledge support under ESA contract SAI 20578/07/NL/UJ.
KeyWords: Atomic physics; Atoms; Bose-Einstein condensation; Interferometers; Interferometry; Optical instruments; Steam condensers, Atom interferometries; Atomic interferometers; Decoherence; Dipolar interactions; Einstein condensates; Lattice sites; Long-range interactions; Magnetic dipolar interactions; Magnetic dipole interactions; Scattering lengths, Flow interactions
DOI: 10.1103/PhysRevLett.101.190405

Citations: 85
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