Resonant excitations of a Bose Einstein condensate in an optical lattice

We investigate experimentally a Bose Einstein condensate placed in a 1D optical lattice whose phase or amplitude is modulated in a frequency range resonant with the first bands of the band structure. More precisely, we study the effect of the strength of a weak extra external confinement superimpose...

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Bibliographic Details
Published in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2019-08, Vol.73 (8), p.1-8, Article 170
Main Authors: Cabrera-Gutiérrez, Citlali, Michon, Eric, Arnal, Maxime, Chatelain, Gabriel, Brunaud, Vincent, Kawalec, Tomasz, Billy, Juliette, Guéry-Odelin, David
Format: Article
Language:English
Subjects:
Applications of Nonlinear Dynamics and Chaos Theory
Atomic
Banded structure
Bose-Einstein condensates
Computer simulation
Condensates
Condensed Matter
Confinement
Frequency ranges
Mapping
Molecular
Optical and Plasma Physics
Optical lattices
Phonons
Physical Chemistry
Physics
Physics and Astronomy
Quantum Gases
Quantum Information Technology
Quantum Physics
Regular Article
Spectroscopy/Spectrometry
Spintronics
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Summary:We investigate experimentally a Bose Einstein condensate placed in a 1D optical lattice whose phase or amplitude is modulated in a frequency range resonant with the first bands of the band structure. More precisely, we study the effect of the strength of a weak extra external confinement superimposed to the lattice on the 1 and 2-phonon transitions. We identify lines immune or very sensitive to the external confinement despite many orders of magnitude of difference in strength compared to the lattice. We interpret those features and present 1D numerical simulations including atom-atom interactions consistent with the experimental observations. Using the band mapping technique, we also get a direct access to the populations that have undergone n -phonon transitions for each modulation frequency including for non-zero quasi-momentum. Graphical abstract
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/e2019-90672-4