Ultracold atoms in radio-frequency dressed potentials beyond the rotating-wave approximation

Journal Article · Sun Jul 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.013401· OSTI ID:21011248

Hofferberth, S; Fischer, B ^[1]; Schumm, T ^[2]; Schmiedmayer, J ^[1]; Lesanovsky, I ^[1]

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1. Physikalisches Institut, Universitaet Heidelberg, Philosophenweg 12, D-69120 Heidelberg (Germany)
2. Atominstitut der Oesterreichischen Universitaeten, TU-Wien, Stadionallee 2, A-1020 Vienna (Austria)

We study dressed Bose-Einstein condensates in an atom chip radio-frequency trap. We show that in this system sufficiently strong dressing can be achieved to cause the widely used rotating-wave approximation (RWA) to break down. We present a full calculation of the atom-field coupling which shows that the non-RWA contributions quantitatively alter the shape of the emerging dressed adiabatic potentials. The non-RWA contributions furthermore lead to additional allowed transitions between dressed levels. We use rf spectroscopy of Bose-Einstein condensates trapped in the dressed state potentials to directly observe the transition from the RWA to the beyond-RWA regime.

• OSTI ID: 21011248
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
APPROXIMATIONS
ATOMS
BOSE-EINSTEIN CONDENSATION
OPTICS
POTENTIALS
RADIOWAVE RADIATION
RF SYSTEMS
SPECTROSCOPY
TRAPPING
TRAPS