Probing Energy-Dependent Feshbach Resonances by Optical Control

Abstract

Optical control enables new high resolution probes of narrow collisional (Feshbach) resonances, which are strongly dependent on the relative momentum of colliding atom pairs, and important for simulating neutron matter with ultracold atomic gases. We demonstrate a two-field optical vernier, which expands kHz (mG) magnetic field detunings near a narrow resonance into MHz optical field detunings, enabling precise control and characterization of the momentum-dependent scattering amplitude. Two-photon loss spectra are measured for the narrow resonance in ${}^6$Li, revealing rich structure in very good agreement with our theoretical model. However, anomalous frequency shifts between the measured and predicted two-photon spectra are not yet explained.

5 pages 5 figures

References in corpus (8)

• Many-Body Physics with Ultracold Gases
• Tuning the scattering length with an optically induced Feshbach resonance
• Controlling a magnetic Feshbach resonance with laser light
• Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance
• Cross-Molecular Coupling in Combined Photoassociation and Feshbach Resonances
• Three-body recombination near a narrow Feshbach resonance in ${}^6$Li
• Realizing Fulde-Ferrell Superfluids via a Dark-State Control of Feshbach Resonances
• Center-of-mass-momentum-dependent interaction between ultracold atoms

Cited by in corpus (8)

• Cooper Triples in Attractive Three-Component Fermions: Implication for Hadron-Quark Crossover
• Theory of strongly paired fermions with arbitrary short-range interactions
• Role of the effective range in the density-induced BEC-BCS crossover
• Characterization of the magnetic field through the three-body loss near a narrow Feshbach resonance
• Proposed Fermi-surface reservoir-engineering and application to realizing unconventional Fermi superfluids in a driven-dissipative non-equilibrium Fermi gas
• Nonequilibrium BCS-BEC crossover and unconventional FFLO superfluid in a strongly interacting driven-dissipative Fermi gas
• Engineering nonequilibrium superconducting phases in a voltage-driven superconductor under an external magnetic field
• Precise Feshbach resonance spectroscopy using tight anharmonic traps