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Q: Fachverband Quantenoptik und Photonik

Q 69: Collective Effects and Disordered Systems

Q 69.5: Talk

Friday, March 6, 2026, 12:00–12:15, P 2

Long-range dipolar interactions in dilute, thermal alkali gases — Friedemann Landmesser, Vyacheslav Shatokhin, Ulrich Bangert, Frank Stienkemeier, Andreas Buchleitner, and •Lukas Bruder — Institute of Physics, Hermann-Herder-Straße 3, 79104, niversity of Freiburg

Unraveling the weak long-range interactions in disordered systems is challenging due to the dominating inhomogeneous spectral broadening. We have developed a highly sensitive nonlinear spectroscopy method to solve this problem [1]. This method is applied to dilute thermal alkali vapors. In a combined experimental and theoretical approach, we find evidence that in these systems the retarded, long-range part of the dipole-dipole interaction has to be taken into account to properly describe the inter-atomic many-body interactions [2].

[1] L. Bruder et al., Phys. Chem. Chem. Phys. 21, 2276 (2019). [2] V. Shatokhin et al. arXiv:2508.11480 (2025).

Keywords: nonlinear spectroscopy; fluorescence anisotropy; multiple quantum coherneces; dipole-dipole interactions; atomic vapor