Title: Probing Atomic Interactions near a Feshbach Resonance
R. L. Compton, Y.-J. Lin, K. Jiminez-Garcia, and I. B. Spielman
Affiliation: Laser Cooling Group, NIST Gaithersburg, MD 20899.
Quantum degenerate gases, for example Bose-Einstein condensates, are non-ideal gases in which interaction energies can be comparable to the kinetic energy. Recently it has become possible to increase interaction energies using a magnetically tunable Feshbach resonance. A Feshbach resonance leads to an enhancement of the atomic scattering length for an “open channel” scattering state, due to a (near) degeneracy with a “closed channel” molecular bound state. Here, we study a Feshbach resonance near 1007 G in 87Rb. Within 1 G of the resonance, we observe an enhancement of the three body loss rate constant, K3, by as much as three orders of magnitude. We compare this observation to a direct measurement of the scattering length. Finally, we use a spectroscopic technique to map the energy of the bound state relative to the unbound state as a function of magnetic field. This work builds on a new paradigm in which dilute atomic gases can be used to simulate condensed matter systems, where strong interactions give rise to interesting correlations.
Mentors Name: Ian B. Spielman
Atomic Physics Division, 842
B253, Building 216, Mail stop 8424
Is your mentor a Sigma Xi Member? No