Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 42: Ultracold Plasmas and Rydberg Systems III (with Q)

A 42.4: Vortrag

Freitag, 27. März 2015, 11:45–12:00, P/H2

Resonant Rydberg dressing of two-electron atoms — •Christopher Gaul and Thomas Pohl — Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden

We study the emergence of effective atomic interactions from resonant laser excitation to high-lying, strongly interacting Rydberg states. Specifically, we consider two-electron atoms which permit two-photon coupling via a long-lived intermediate triplet state. Exploiting the formation of a dark state on resonance, we demonstrate that losses due to spontaneous decay can be greatly suppressed in this system. At the same time, the correlated Rydberg-excitation dynamics gives rise to significant effective interactions between two driven atoms.

Studying the resulting correlated steady state, we identify a two-body resonance, where induced light shifts balance with the Rydberg interaction and the laser detuning. Under strong driving, this resonance is shown to enable greatly enhanced effective interactions while keeping the corresponding decoherence rates at a very low level.

Compared to previous two-level schemes this new approach is found to yield much stronger interactions and shown to permit flexible tunability of the magnitude as well as the shape of the effective interaction potential. Potential applications will also be discussed.