[Zurück]

S. Hofferberth, B. Fischer, H.-J. Schmiedmayer, I. Lesanovsky, Thorsten Schumm:
"Ultracold atoms in radio-frequency dressed potentials beyond the rotating-wave approximation";
Physical Review A, 76 (2007), S. 013401-1 - 013401-5.

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.