Mainz 2017 – scientific programme

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MO: Fachverband Molekülphysik

MO 12: Posters 2: Molecular Dynamics, Clusters, and High Resolution Spectroscopy

MO 12.2: Poster

Wednesday, March 8, 2017, 17:00–19:00, P OG1

Collective resonances in dilute vapors — •Lukas Bruder, Ulrich Bangert, Marcel Binz, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg

We have developed a phase-modulated pump-probe method which allows for efficient isolation and detection of multiple-quantum coherence signals. With this, we observed for the first time higher-order collective resonances in dilute atomic vapors [1]. The origin of these signals is debated since interatomic interactions are small in these systems [2]. Recently, we have significantly improved the spectral resolution in our setup (∼ 1 GHz) and characterized the phase signature of the observed resonances. This revealed a phase characteristic depending on the fundamental hyperfine states. Our results have triggered interest from several theory groups currently working on an explanation of this phenomenon.
[1] L. Bruder, M. Binz, and F. Stienkemeier, Phys. Rev. A 92, 053412 (2015).
[2] S. Mukamel, J. Chem. Phys. 145, 41102 (2016).