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Dressed-State Spectroscopy and Magic Trapping of Microwave-Shielded NaCs Molecules
Siwei Zhang1, Weijun Yuan1, Niccolò Bigagli1
1Columbia University, Department of Physics, New York, New York 10027, USA.
Physical Review Letters
|January 29, 2025
Summary
We engineered a magic rotational transition in ultracold NaCs molecules, making optical polarizability independent of laser intensity. This advance is key for cooling molecules and creating molecular Bose-Einstein condensates.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Quantum Chemistry
- Condensed Matter Physics
Background:
- Ultracold molecules are crucial for quantum simulation and precision measurements.
- Controlling molecular properties like optical polarizability is essential for advanced applications.
- Previous methods lacked precise control over molecular interactions and states.
Purpose of the Study:
- To investigate the optical polarizability of microwave-shielded ultracold sodium-cesium (NaCs) molecules.
- To explore the dependence of optical polarizability on microwave dressing fields.
- To engineer a magic rotational transition for enhanced control and stability.
Main Methods:
- Utilizing an optical dipole trap to confine ultracold NaCs molecules.
- Applying microwave fields to dress pairs of rotational states.
- Establishing dressed-state spectroscopy to characterize differential energy shifts.
- Investigating the influence of microwave field intensity and detuning.
Main Results:
- Observed a significant dependence of optical polarizability on microwave dressing field parameters.
- Successfully engineered a magic rotational transition for strong dressing fields.
- Demonstrated the engineered transition's insensitivity to laser intensity fluctuations.
- Provided precise characterization of energy shifts in dressed rotational states.
Conclusions:
- The engineered magic rotational transition offers robust control over molecular optical polarizability.
- This work has direct implications for evaporative cooling of molecules.
- The findings support the creation of molecular Bose-Einstein condensates and enable precision microwave spectroscopy.
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