Multichannel Quantum Defect Theory with Numerical Reference Functions: Applications to Cold Atomic Collisions
Abstract
We develop a method for calculating multichannel wavefunctions in the spirit of quantum defect theory, based on numerically calculated reference functions. We benchmark the method by calculating cold collisional properties of 85Rb and 6Li in the presence of external magnetic fields tuned across specific s-wave Feshbach resonances and thereby reproducing known results. We then apply the method to calculate experimentally observed d-wave Feshbach resonance in 87Rb-85Rb cold collisions. Our numerical results for this d-wave resonance show good agreement with the experimental observations. The method is applicable to arbitrary interaction potentials and to any energy range near the scattering threshold. The implementation of our method to any multichannel two-body scattering problem is straightforward.
Fields of Study & Subjects
Cold Atom Physics and Bose-Einstein Condensates
Quantum and electron transport phenomena
Quantum optics and atomic interactions
Publication details
- Journal / source
- Atoms
- Publisher
- MDPI AG
- Volume
- 14
- Issue
- 3
- Pages
- 26–26
- Publication date
- 21 March 2026
- Language
- EN