Probing multiple-frequency atom-photon interactions with ultracold atoms
Kathrin Luksch, Elliot Bentine, Adam J. Barker, Shinichi Sunami,, Tiffany L. Harte, Ben Yuen, and Christopher J. Foot
TL;DR
This paper explores complex atom-photon interactions in ultracold atoms dressed with multiple radiofrequency fields, combining theoretical modeling with experimental spectroscopy to observe and verify high-order transitions.
Contribution
It provides a comprehensive theoretical framework and experimental validation for multiple-frequency atom-photon interactions, including the first observation of high-order transitions.
Findings
Observation of transitions up to sixth order in the probe field
Excellent agreement between theory and experiment
Verification of previously unobserved transitions
Abstract
We dress atoms with multiple-radiofrequency fields and investigate the spectrum of transitions driven by an additional probe field. A complete theoretical description of this rich spectrum is presented, in which we find allowed transitions and determine their amplitudes using the resolvent formalism. Experimentally, we observe transitions up to sixth order in the probe field using radiofrequency spectroscopy of Bose-Einstein condensates trapped in single- and multiple-radiofrequency-dressed potentials. We find excellent agreement between theory and experiment, including the prediction and verification of previously unobserved transitions, even in the single-radiofrequency case.
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