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Updated: Jun 21, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Overcoming Temperature Limits in the Optical Cooling of Solids Using Light-Dressed States
Luísa Toledo Tude1, Conor N Murphy1, Paul R Eastham1
1School of Physics, <a href="https://ror.org/02tyrky19">Trinity College Dublin</a>, Dublin 2, Ireland and Trinity Quantum Alliance, Unit 16, Trinity Technology and Enterprise Centre, Pearse Street, Dublin 2, Ireland.
Abstract:
Laser cooling of solids currently has a temperature floor of 50-100 K. We propose a method that could overcome this using defects, such as diamond color centers, with narrow electronic manifolds and bright optical transitions. It exploits the dressed states formed in strong fields which extend the set of phonon transitions and have tunable energies. This allows an enhancement of the cooling power and diminishes the effect of inhomogeneous broadening. We demonstrate these effects theoretically for the silicon vacancy and the germanium vacancy, and discuss the role of background absorption, phonon-assisted emission, and nonradiative decay.
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