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Dressed dense atomic gases

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


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.


Lesanovsky, I., Olmos, B., Guerin, W., & Kaiser, R. (2019). Dressed dense atomic gases. Physical Review A, 100(2),

Journal Article Type Article
Acceptance Date Aug 2, 2019
Online Publication Date Aug 26, 2019
Publication Date Aug 26, 2019
Deposit Date Aug 4, 2019
Publicly Available Date Aug 8, 2019
Journal Physical Review A
Print ISSN 2469-9926
Electronic ISSN 1094-1622
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 100
Issue 2
Article Number 021401(R)
Public URL
Publisher URL


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