Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 57: Quantum Sensing: Spectroscopy I
FM 57.3: Talk
Wednesday, September 25, 2019, 14:45–15:00, 2006
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 experimental studies have revealed collective effects in fluorescence spectra of dilute atomic gases using a pump-probe measurement scheme within phase-modulated nonlinear spectroscopy [1]. The corresponding spectral features can be discerned down to the lowest experimentally accessible densities of ∼ 107 cm−3, and can be interpreted as a sensitive probe of residual dipole-dipole interactions.
To provide a quantitative theoretical description of this phenomenology, we adapt an open quantum system treatment which was already employed [2] to model coherent backscattering from a dilute cloud of atomic (hence, manifestly quantum) scatterers. It includes the retarded interaction as mediated by the quantized vacuum field, and is hence valid across all length scales (or densities). Approximate analytical results are compared to a fully numerical treatment of the resulting master equation, and a first confrontation of our theoretical approach with published experimental data is presented.
[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)