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Abstract: We have observed Stueckelberg oscillations in the dipole-dipole interactionbetween Rydberg atoms with an externally applied radio-frequency field. Theoscillating RF field brings the interaction between cold Rydberg atoms in twoseparated volumes into resonance. We observe multi-photon transitions whenvarying the amplitude of the RF-field and the static electric field offset. Theangular momentum states we use show a quadratic Stark shift, which leads to afundamentally different behavior than linearly shifting states. Both cases arestudied theoretically using the Floquet approach and are compared. Theamplitude of the sidebands, related to the interaction strength, is given bythe Bessel function in the linearly shifting case and by the generalized Besselfunction in the quadratically shifting case. The oscillatory behavior of bothfunctions corresponds to Stueckelberg oscillations, an interference effectdescribed by the semi-classical Landau-Zener-Stueckelberg model. Themeasurements prove coherent dipole-dipole interaction during at least 0.6micro-seconds.

Autor: C. S. E. van Ditzhuijzen, Atreju Tauschinsky, H. B. van Linden van den Heuvell

Fuente: https://arxiv.org/

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