Ultracold heteronuclear fermi-fermi molecules

Area of Science:

• Quantum physics
• Ultracold atoms and molecules
• Quantum chemistry

Background:

• Ultracold heteronuclear molecules are crucial for fundamental physics research and quantum technologies.
• Creating and controlling molecules from two different fermionic species presents significant experimental challenges.

Purpose of the Study:

• To report the first creation of ultracold bosonic heteronuclear molecules from two fermionic species (6Li and 40K).
• To investigate the association efficiency and molecular lifetimes near an interspecies Feshbach resonance.

Main Methods:

• Utilized a magnetic field sweep across an interspecies s-wave Feshbach resonance to associate molecules.
• Employed direct imaging techniques to observe and measure molecular properties.
• Stored the molecule-atom mixture in a harmonic trap.

Main Results:

• Successfully created ultracold bosonic heteronuclear molecules of 6Li and 40K.
• Achieved high association efficiencies of up to 50%, creating up to 4x10^4 molecules.
• Measured increased molecular lifetimes exceeding 100 ms near the Feshbach resonance.

Conclusions:

• Demonstrated a robust method for creating ultracold bosonic heteronuclear molecules from fermionic precursors.
• The observed long molecular lifetimes open possibilities for advanced studies in ultracold chemistry and quantum simulation.
• This work provides a new platform for exploring quantum phenomena with heteronuclear molecules.