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Probing Energy-Dependent Feshbach Resonances by Optical Control.
N Arunkumar1, A Jagannathan1,2, J E Thomas1
1Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA.
Physical Review Letters
|November 3, 2018
Summary
We developed an optical vernier technique to precisely control ultracold atomic gases near Feshbach resonances. This method allows detailed study of momentum-dependent scattering, crucial for simulating neutron matter.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Quantum Simulation
- Condensed Matter Physics
Background:
- Feshbach resonances are critical for controlling ultracold atomic gases.
- Simulating neutron matter requires precise understanding of atomic interactions.
- Momentum-dependent scattering amplitudes are key to these simulations.
Purpose of the Study:
- To develop a high-resolution method for probing narrow Feshbach resonances.
- To enable precise control and characterization of momentum-dependent scattering amplitudes.
- To advance the simulation of neutron matter using ultracold atomic gases.
Main Methods:
- Demonstration of a two-field optical vernier technique.
- Expansion of kilohertz (mG) magnetic field detunings into megahertz optical field detunings.
- Measurement of two-photon loss spectra for a narrow resonance in Lithium-6 (⁶Li).
Main Results:
- Rich structure observed in the two-photon loss spectra.
- Excellent agreement between experimental data and theoretical models.
- Identification of anomalous overall frequency shifts not yet explained by theory.
Conclusions:
- The optical vernier technique provides unprecedented control over ultracold atomic gases.
- The observed spectral structure validates theoretical predictions for momentum-dependent scattering.
- Further theoretical work is needed to explain the observed frequency shifts.
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