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\nLossy quantum defect theory of ultracold molecular collisions

Arthur Christianen, Gerrit C. Groenenboom, Tijs Karman

Published Jan 1, 2021• 16 citations
Publisher

Abstract

\n Contains fulltext :\n 244831.pdf (Publisher’s version ) (Open Access)\n
DOI
10.1103/physreva.104.043327

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We extend the powerful formalism of multichannel quantum defect theory combined with a frame transformation to ultracold atom-molecule collisions in magnetic fields. By solving the coupled-channel equations with hyperfine and Zeeman interactions omitted at short range, the extended theory enables a drastically simplified description of the intricate quantum dynamics of ultracold molecular collisions in terms of a small number of short-range parameters. We apply the formalism to ultracold Mg+NH collisions in a magnetic field, achieving a 10^{4}-fold reduction in computational effort.