Lellouch-Lüscher Relation for Ultracold Few-Atom Systems under Confinement
Abstract
We derive an analog of the Lellouch-Lüscher (LL) relation for few-body bosonic systems, linking few-body scattering loss rates to the energies and widths of the corresponding harmonically trapped few-body states. Three-body numerical simulations show that the LL relation applies across a broad range of interaction strengths and energies and allows the determination of scattering rates within a single partial wave. Our Letter establishes a robust theoretical framework for understanding the role of the finite-volume effect in few-body observables in optical lattice and tweezer experiments, enabling precise determination of multibody scattering rates.
Fields of Study & Subjects
Cold Atom Physics and Bose-Einstein Condensates
Quantum many-body systems
Physics of Superconductivity and Magnetism
Publication details
- Journal / source
- Physical Review Letters
- Volume
- 136
- Issue
- 20
- Pages
- 203401–203401
- Publication date
- 21 April 2026
- Language
- EN