Stuttgart 2012 – wissenschaftliches Programm
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SYRA: Symposium Ultracold Rydberg Atoms and Molecules
SYRA 3: Ultracold Rydberg Atoms and Molecules 3
SYRA 3.6: Vortrag
Donnerstag, 15. März 2012, 11:45–12:00, V7.03
Coherence on Förster resonances between Rydberg atoms — •Alexander Krupp, Johannes Nipper, Jonathan Balewski, Robert Löw, and Tilman Pfau — 5.Physikalisches Institut, Universität Stuttgart
Förster resonances are non-radiative dipole-dipole
interactions between oscillating dipoles. Especially in biochemistry these
resonances play a crucial role and describe the energy transfer process between
two chromophores, parts of molecules which are responsible for their colors.
In our work these resonances occur between a pair of
Rydberg atoms, creating strong interactions between the atoms.
We report on studies of Förster resonances between Rydberg atoms in an
ultra-cold atomic cloud of 87Rb. By applying a small electric field we
tune dipole coupled pair states into resonance, giving rise to Förster
resonances. Via a Ramsey-type atom interferometer we can resolve
several resonances at distinct electric field strengths. We study the
coherence of the system at and close to the resonances and we observe a change in phase and visibility
of the Ramsey fringes on resonance. The individual resonances are expected
to exhibit different angular dependencies, opening the possibility to tune not only the interaction
strength but also the angular dependence of the pair state potentials by an
external electric field. In summary, we now have a tool to coherently
tune interactions between Rydberg atoms. In further studies Rydberg
atoms could be used as a model system to simulate energy transfer
processes in bio-molecules.