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Kilohertz-driven Bose-Einstein condensates in optical lattices

Arimondo, Ennio and Ciampini, Donatella and Eckardt, André and Holthaus, Martin and Morsch, Oliver (2012) Kilohertz-driven Bose-Einstein condensates in optical lattices. In: Advances In Atomic, Molecular, and Optical Physics. Elsevier, p. 515.

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We analyze time-of-flight absorption images obtained with dilute Bose-Einstein con-densates released from shaken optical lattices, both theoretically and experimentally. We argue that weakly interacting, ultracold quantum gases in kilohertz-driven optical potentials constitute equilibrium systems characterized by a steady-state distri-bution of Floquet-state occupation numbers. Our experimental results consistently indicate that a driven ultracold Bose gas tends to occupy a single Floquet state, just as it occupies a single energy eigenstate when there is no forcing. When the driving amplitude is sufficiently high, the Floquet state possessing the lowest mean energy does not necessarily coincide with the Floquet state connected to the ground state of the undriven system. We observe strongly driven Bose gases to condense into the former state under such conditions, thus providing nontrivial examples of dressed matter waves.

Item Type: Book Section
Additional Information: Imported from arXiv
Subjects: Area02 - Scienze fisiche > FIS/03 - Fisica della materia
Divisions: Dipartimenti (until 2012) > DIPARTIMENTO DI FISICA " E. FERMI"
Depositing User: dott.ssa Sandra Faita
Date Deposited: 08 Apr 2015 10:21
Last Modified: 08 Apr 2015 10:21
URI: http://eprints.adm.unipi.it/id/eprint/1386

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