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

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

2006-11-23

arxiv.org/abs/quant-ph/0611240v2

Phys. Rev. A 76, 013401 (2007)

Physics

Quantum Physics

6 pages, 4 figures

Scientific paper

10.1103/PhysRevA.76.013401

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.

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