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Q: Fachverband Quantenoptik und Photonik
Q 51: Quantum Optics IV
Q 51.3: Vortrag
Donnerstag, 12. März 2020, 14:30–14:45, f342
Dynamical detection of dipole-dipole interactions in dilute atomic gases — •Benedikt Ames, Edoardo Carnio, Vyacheslav Shatokhin, and Andreas Buchleitner — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg
Recent experiments have identified signatures of the dipole-dipole interaction in extremely dilute, thermal atomic vapors via fluorescence signals excited by ultrashort, phase-modulated laser pulses [1]. The nonlinear spectroscopic technique allows to extract spectral features stemming from collective effects from an intense single-scattering background, down to the lowest experimentally accessible densities of ∼ 107 cm−3.
To provide quantitative, analytical expressions for the fluorescence signals, we use an open quantum system treatment which was previously employed to investigate coherent backscattering of light by cold atoms [2]. By adapting it to time-dependent driving, we obtain a model which is non-perturbative in the atom-laser interaction and admits a series expansion with respect to the weak inter-atomic coupling as mediated by the exchange of (transverse) photons. In terms of those single- and double-scattering contributions to the scattering series which survive the average over random atomic configurations, we interpret the lineshapes and relative strength of single- and double-quantum coherence signals.
[1] L. Bruder et al., Phys. Chem. Chem. Phys. 21, 2276–2282 (2019)
[2] V. Shatokhin, C. Müller, A. Buchleitner, Phys. Rev. A 73, 063813 (2006)