Cooperative effects and Anderson localization of light with cold atoms
| When |
Nov 04, 2019
from 11:00 to 12:00 |
|---|---|
| Where | Amphi. Schrödinger |
| Attendees |
Romain Bachelard |
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Cold atom clouds scattering light appear as an ideal platform to study
long-range interactions, either classically or quantum-mechanically:
The dipole-dipole interactions present a long-range 1/r decay, which
gives rise to macroscopic modes and 'cooperative' effects. In dilute
clouds, superradiance, subradiance or collective vacuum Rabi splitting
are examples of such effects, which can be interpreted as signatures
of long-range interactions.
In the dense regime, the rise of near-field terms changes the deal, as
the interactions between neighbouring particles is favored. In
particular, these terms appear to prevent Anderson localization of
light, despite short-range contributions would be expected to support
the localization process. This mechanism is also present in 2D
scattering, despite the general belief that disordered 2D systems
always localize. Finally, I will discuss the perspectives for light
localization in two and three dimensions.