Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 16: Collisions, Scattering and Correlation Phenomena I

A 16.3: Vortrag

Mittwoch, 12. März 2025, 15:15–15:30, HS PC

Towards Light Scattering Experiments in Dense Dipolar Gases — •Rhuthwik Sriranga, Marvin Proske, Ishan Varma, Chung-Ming Hung, Dimitra Cristea, and Patrick Windpassinger — Johannes-Gutenberg Universität Mainz

In ultracold atomic ensembles where interatomic spacing is smaller than the wavelength of scattered light, direct matter-matter coupling through electric and magnetic interactions significantly influence system dynamics, challenging the approximation of atoms as independent emitters. We study the role of magnetic dipole-dipole interactions (DDI) in the cooperative behavior of dense atomic ensembles using dysprosium, which has the highest ground-state magnetic moment (10 Bohr magnetons). Our light-scattering experiments probe these effects in thermal and degenerate dense dipolar media.

This presentation details progress in generating ultradense cold dysprosium clouds, including optical transport of atoms into a home-built science cell enabling precise cloud manipulation. The cell's compact design allows tight dipole trapping with a high numerical aperture objective made in-house. We also discuss the impact of optical dipole trap polarization on atomic lifetime and outline future experiments to uncover collective effects, advancing the study of cooperative quantum phenomena.

Keywords: Ultracold dipolar gases; Optical Dipole Trap; Superradience; Collective effect; Light-matter interaction