Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 56: Entanglement: Many-Body Dynamics II

FM 56.3: Talk

Mittwoch, 25. September 2019, 14:45–15:00, 2004

Many-body effects in cold molecules using phase-modulated two-dimensional coherent spectroscopy — •Friedemann Landmesser, Ulrich Bangert, Lukas Bruder, Marcel Binz, Daniel Uhl, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Germany

Many-body quantum states are considered to play a crucial role in atomic and molecular systems with respect to dissipation, excitation and energy transfer (cf. [1]). We aim to investigate collective effects in organic molecules by multiple-quantum coherence experiments where multiphoton processes can be separated from one-photon transitions and can be assigned to specific particle numbers [2,3]. We will adapt a detection scheme based on phase-modulated two-dimensional coherent spectroscopy which was already used to investigate multi-atom Dicke states in potassium vapor [3,4]. Measurements on a rubidium vapor will serve as a benchmark. To study collective effects in organic molecular systems, we will adapt our helium nanodroplet source to produce solid rare gas clusters, that can be doped with hundreds of organic molecules. The cluster surface acts as a well-defined, cold environment [5]. In lifetime measurements we already identified collective effects of the interacting molecules at increasing doping densities [5].

[1] F. Fassioli et al., J. Royal Soc. Interface 11, 20130901 (2014).

[2] L. Bruder et al., Phys. Rev. A 92, 053412 (2015).

[3] S. Yu et al., Opt. Lett. 44, 2795 (2019).

[4] L. Bruder et al., Phys. Chem. Chem. Phys. 21, 2276 (2019).

[5] S. Izadnia et al., J. Phys. Chem. Lett. 8, 2068 (2017).