Collective Dynamical Fermi Suppression of Optically Induced Inelastic Scattering

Area of Science:

• Atomic, Molecular, and Optical Physics
• Quantum Gases
• Condensed Matter Physics

Background:

• Optically induced loss is a common challenge in ultracold atomic gases.
• Controlling interactions in quantum systems is crucial for quantum technologies.
• Fermi gases offer a platform to study quantum many-body phenomena.

Purpose of the Study:

• To investigate the dynamical suppression of optically induced loss in a Fermi gas.
• To explore the role of interactions and magnetic properties in loss suppression.
• To demonstrate optical control over effective long-range interactions.

Main Methods:

• Utilizing a trapped cigar-shaped Fermi gas.
• Tuning the s-wave scattering length to modify interactions.
• Employing optical control techniques.
• Developing a quasiclassical collective spin vector model incorporating spin-dependent loss.

Main Results:

• Observed strong dynamical suppression of optically induced loss with increasing s-wave scattering length.
• Demonstrated that the Fermi gas acts as a tunable Heisenberg spin lattice.
• Showed loss suppression correlates with the transition to a magnetized state.
• Confirmed that fermionic nature inhibits interactions in the magnetized state.

Conclusions:

• The study successfully demonstrates dynamical loss suppression in Fermi gases via optical control.
• The findings enable the application of optical control for effective long-range interactions.
• The developed model quantitatively explains the observed phenomena, validating the approach.