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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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Sound Propagation in a Bose-Fermi Mixture: From Weak to Strong Interactions.

Krutik Patel¹, Geyue Cai¹, Henry Ando¹

¹The James Franck Institute, Enrico Fermi Institute, and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.

Physical Review Letters

|September 8, 2023

Summary

Researchers studied quasiparticles in Bose-Fermi mixtures, observing sound mode softening and surprising reemergence of stable sound propagation. This opens new avenues for exploring quantum phenomena in strongly interacting systems.

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Area of Science:

Quantum physics
Condensed matter physics
High energy physics

Background:

Particlelike excitations (quasiparticles) from interacting quantum fields are key to many quantum phenomena.
Studying these quasiparticles is challenging, especially in strongly interacting systems.
Bose-Fermi mixtures provide a tunable platform to investigate quasiparticle behavior.

Purpose of the Study:

To investigate phonon propagation in a Bose-Einstein condensate (BEC) within a degenerate Fermi gas.
To explore the impact of interspecies interactions, tuned via Feshbach resonance, on phonon behavior.

Main Methods:

Utilized a quantum degenerate Bose-Fermi mixture.
Controlled interspecies scattering length ($a_{BF}$) using a Feshbach resonance.
Observed and analyzed phonon propagation dynamics.

Main Results:

Sound mode softening was observed with moderate attractive interspecies interactions.
Stable phonon propagation unexpectedly reemerged and persisted across the Feshbach resonance with stronger attraction.
Phonon stability in the resonant interaction regime was demonstrated.

Conclusions:

The stability of phonons under resonant interactions offers new possibilities.
Enables the investigation of novel Bose-Fermi liquids.
Provides a pathway to study fermionic pairing in strongly interacting regimes.