Resonant Dipolar Collisions of Ultracold Molecules Induced by Microwave Dressing

We demonstrate microwave dressing on ultracold, fermionic 23Na40K ground-state molecules and observe resonant dipolar collisions with cross sections exceeding 3 times the s -wave unitarity limit. The origin of these interactions is the resonant alignment of the approaching molecules' dipoles al...

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Veröffentlicht in:Physical review letters 2020-08, Vol.125 (6), p.1-063401, Article 063401
Hauptverfasser: Yan, Zoe Z., Park, Jee Woo, Ni, Yiqi, Loh, Huanqian, Will, Sebastian, Karman, Tijs, Zwierlein, Martin
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container_end_page 063401
container_issue 6
container_start_page 1
container_title Physical review letters
container_volume 125
creator Yan, Zoe Z.
Park, Jee Woo
Ni, Yiqi
Loh, Huanqian
Will, Sebastian
Karman, Tijs
Zwierlein, Martin
description We demonstrate microwave dressing on ultracold, fermionic 23Na40K ground-state molecules and observe resonant dipolar collisions with cross sections exceeding 3 times the s -wave unitarity limit. The origin of these interactions is the resonant alignment of the approaching molecules' dipoles along the intermolecular axis, which leads to strong attraction. We explain our observations with a conceptually simple two-state picture based on the Condon approximation. Furthermore, we perform coupled-channel calculations that agree well with the experimentally observed collision rates. The resonant microwave-induced collisions found here enable controlled, strong interactions between molecules, of immediate use for experiments in optical lattices.
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subjects Collision rates
Dipoles
Optical lattices
title Resonant Dipolar Collisions of Ultracold Molecules Induced by Microwave Dressing
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