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Dressed dense atomic gases

Lesanovsky, Igor; Olmos, Beatriz; Guerin, William; Kaiser, Robin


Igor Lesanovsky

Beatriz Olmos

William Guerin

Robin Kaiser


The interaction between atomic transition dipoles and photons leads to the formation of many-body states with collective dissipation and long-ranged interactions. Here, we put forward and explore a scenario in which a dense atomic gas — where the separation of the atoms is comparable to the transition wavelength — is weakly excited by an off-resonant laser field. We develop the theory for describing such dressed many-body ensemble and show that collective excitations are responsible for the emergence of many-body interactions, i.e. effective potentials that cannot be represented as a sum of binary terms. We illustrate how collective effects may be probed experimentally through microwave spectroscopy. We analyze time-dependent line-shifts, which are sensitive to the phase pattern of the dressing laser and show that the strong interactions lead to a dramatic slow down of the relaxation dynamics. Our study offers a new perspective on dense atomic ensembles interacting with light and promotes this platform as a setting for the exploration of dissipative non-equilibrium many-body physics.

Journal Article Type Article
Publication Date Aug 26, 2019
Print ISSN 2469-9926
Electronic ISSN 1094-1622
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 100
Issue 2
Article Number 021401(R)
APA6 Citation Lesanovsky, I., Olmos, B., Guerin, W., & Kaiser, R. (2019). Dressed dense atomic gases. Physical Review A, 100(2),
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