+++ONLINE KOLLOQUIUM+++ A subradiant atomic mirror (M. Sc. David Wei)

Datum: 30.06.2020
Uhrzeit: 14:30
Vortragende(r): M.Sc. David Wei
Quantum Many-Body-Systems Division, MPQ
Ort: +++ONLINE KOLLOQUIUM+++

When quantum emitters are spatially structured on sub-wavelength scales, photon-mediated dipole-dipole interactions can strongly alter the spectral and directional radiative response. Tightly trapped atoms in optical lattices, only coupled to the electromagnetic vacuum, constitute ideal dipolar emitters to study such cooperative behaviour.

In our experiment, we probe the collective properties of a two-dimensional square array of atomic dipoles by performing spectroscopic absorption and reflection measurements. We directly observe considerably subradiant response and demonstrate that the array acts as a reflective mirror formed by a single mono-layer of a few hundred atoms. By varying the atom density within the array, we are able to control the influence of the dipolar interactions. By introducing positional disorder in the atomic ensemble, we analyze the role of the array structure. Its importance is emphasized by dynamically breaking and restoring the order using atomic Bloch oscillations to control the reflectivity of the atomic mirror.

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