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Related Experiment Video

Updated: May 9, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Atom loss resonances in a Bose-Einstein condensate.

Christian Langmack¹, D Hudson Smith, Eric Braaten

¹Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.

Physical Review Letters

|July 30, 2013

Summary

Ultracold atom loss resonances are explained by a new mechanism involving dimer condensate formation. This mechanism predicts enhanced atom loss near atom-dimer and dimer-dimer resonances due to inelastic collisions.

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Area of Science:

Ultracold atomic physics
Quantum many-body systems

Background:

Atom loss resonances in ultracold trapped atoms are observed near atom-dimer and two-dimer resonances.
These resonances are linked to Efimov trimers and universal tetramers crossing specific energy thresholds.

Purpose of the Study:

To propose a novel mechanism for atom loss resonances in Bose-Einstein condensates.
To explain the observed enhancements in atom loss rates.

Main Methods:

Developing a low-energy effective field theory for coexisting atom and dimer condensates.
Utilizing time-dependent scattering length to coherently generate dimer condensates.
Solving classical field equations for atom and dimer condensates.

Main Results:

A new mechanism involving coherent dimer condensate formation from atom condensates is proposed.
The theory predicts narrow enhancements in atom loss rates near atom-dimer and two-dimer resonances.
Inelastic dimer collisions are identified as the cause of these enhanced loss rates.

Conclusions:

The proposed mechanism provides a unified explanation for atom loss resonances.
The effective field theory accurately describes the behavior of ultracold atomic gases near resonances.
This work offers insights into the dynamics of interacting ultracold atomic systems.