Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 29: Quantum Effects
Q 29.2: Vortrag
Mittwoch, 13. März 2019, 11:00–11:15, S Gr. HS Maschb.
Motional effects on cooperative behaviour in an atomic gas — •Jemma Needham1,2, Igor Lesanovsky1,2, and Beatriz Olmos1,2 — 1Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, University of Nottingham, University Park, Nottingham, NG7 2RD, UK. — 2School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
We study the impact of residual motion of atoms in the onset of collective behaviour (such as the observation of super- and subradiant emission of photons) in a weakly driven dense atomic thermal cloud interacting with the radiation field. We systematically derive a quantum master equation that, under the Born and Markov approximations, describe the internal dynamics of such atomic systems. The first order effect of the atomic velocities of the atoms, such as the Doppler shift of the atomic frequencies, are incorporated in this equation from first principles. This allows us to simulate the dynamics of the laser excitation of a dense atomic gas and, in particular, investigate the existence of collective emission for different temperatures of the gas, and hence different atomic velocities. The results obtained here are of direct relevance to a number of experimental groups that study these collective phenomena both in dense and dilute gases [1-4].
[1] Bienaimé, T. et al. Phys. Rev. Lett. 2012, 108(12), 123602.
[2] Guerin, W. et al. Phys. Rev. Lett. 2016, 116(8), 083601.
[3] Pellegrino, J. et al. Phys. Rev. Lett. 2014, 113(13), 133602.
[4] Bromley, et al. Nat. Commun. 2016 7, 11039.