SAMOP 2023 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Machine Learning and Computational and Theoretical Molecular Physics
MO 7.7: Vortrag
Mittwoch, 8. März 2023, 12:45–13:00, F142
Few-Body Physics of the Trapped Atoms: The Configuration Interaction Approach — •Matee ur Rehman1, Alejandro Saenz1, Fabio Revuelta Peña2, Paul Winter1, and Simon Sala1 — 1Humboldt-Universität zu Berlin — 2Universidad Politécnica de Madrid
Two independent theoretical approaches are developed for the computational treatment of interacting ultracold atoms in versatile trap potentials. One approach considers the two-body system in centroid and relative coordinates have recently successfully demonstrated the inelastic confinement-induced resonances occurs due to the anharmonicity of the trap potentials, however an extension beyond two particles is not possible, but evidently of interest. This motivates to consider an alternative approach in absolute coordinates based on standard quantum-chemistry approaches, that uses cartesian Gaussians (GTOs) as basis functions and performs the configuration interaction calculations with a flexible choice of interaction potentials, hence allow considering arbitrary optical tweezer arrays. As the delta-pseudopotential does not work in beyond-mean field description, the Gaussian interaction potential using GTOs allows an efficient solution of multi-centered six-dimensional interaction integrals, but its validity has to be investigated. So this talk will demonstrate both theoretical models by focusing on their pros and cons for different interatomic interaction potentials, and then address the question that, Is the Gaussian interaction potential is sufficient (respectively in which parameter regime is it sufficient) to be used (or within which accuracy it can used).