Rostock 2019 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Ultrafast Multidimensional and Control Approaches

MO 14.3: Talk

Wednesday, March 13, 2019, 14:30–14:45, S HS 001 Biologie

Signatures of dipole-dipole interaction in 2D-spectroscopic signals of atomic gases — •Benedikt Ames, Edoardo Carnio, Vyacheslav Shatokhin, and Andreas Buchleitner — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg

Recent experimental studies have revealed collective effects in 2D fluorescence spectra of dilute atomic gases. These signals persist down to the lowest experimentally accessible densities on the order of 10⁷ cm⁻³ [1]. Given the large interatomic distances in this regime, the exchange of transverse photons is expected to play a significant role in the dipole-dipole interaction.

In order to identify the dominant contributions to the latter, we investigate a model that includes the retarded interaction as mediated by the quantized field and as such is valid across all length scales. In a first approach, we study the time evolution of the system in a master equation formulation that has previously been applied to coherent backscattering in the double scattering regime [2]. Secondly, we treat the same system perturbatively in the atom-laser coupling. By varying the strength of the coupling, we establish conditions under which the master equation approach yields the same results as the perturbative calculation.

[1] L. Bruder, M. Binz, F. Stienkemeier, Phys. Rev. A 92, 053412 (2015)

[2] V. Shatokhin, C. Müller, A. Buchleitner, Phys. Rev. A 73, 063813 (2006)