Two-Element Mixture of Bose and Fermi Superfluids

Area of Science:

• Quantum physics
• Ultracold atomic gases
• Many-body physics

Background:

• Superfluidity in ultracold atomic gases is a key area of quantum physics research.
• Creating mixtures of bosonic and fermionic superfluids allows for the study of interspecies interactions.
• Understanding interspecies interactions is crucial for controlling quantum systems.

Purpose of the Study:

• To produce a stable mixture of bosonic and fermionic superfluids using ^{174}Yb and ^{6}Li.
• To investigate the elastic coupling and angular momentum exchange between these superfluids.
• To determine the sign of the interspecies scattering length.

Main Methods:

• Preparation of a stable mixture of ^{174}Yb (bosonic) and ^{6}Li (fermionic) ultracold atomic gases.
• Measurement of the dipole oscillation frequency shift in the bosonic component due to the presence of fermions.
• Observation and analysis of the scissors mode excitation in the bosonic component.

Main Results:

• Demonstrated elastic coupling between bosonic and fermionic superfluids.
• Determined the previously unknown positive sign of the interspecies scattering length.
• Observed angular momentum exchange between the superfluids via interspecies interactions.

Conclusions:

• The study successfully created and characterized a mixed-species superfluid system.
• The findings provide crucial insights into interspecies interactions in quantum gases.
• This work opens avenues for exploring novel quantum phenomena in mixed superfluids.