You are here: Home / Seminars / Seminar Database / Fermion Pairing with Ultracold Atoms

Fermion Pairing with Ultracold Atoms

Main Content

Whitfield Lecture Lecture by Randall Hulet from Rice University
12 April 2007 from 4:00 PM to 5:00 PM
117 Osmond Laboratory
Add event to calendar

Ultracold atomic fermions have the potential for simulating important, and in some cases, unsolved models of condensed matter physics. In addition to being clean and well-characterized, the physical parameters of ultracold atomic gases are readily tunable. Of most interest is the tunability of interactions via a magnetically-tuned collisional (Feshbach) resonance. I will discuss experiments on the pairing of 6Li, a composite fermion, where a Feshbach resonance enables the realization of the BEC-BCS crossover. We use the rate of optical excitation to an excited molecular level to measure the relative magnitude of the order parameter throughout the cross-over regime. Furthermore, two-component Fermi gases with unequal spin populations are readily realized. I will discuss the experimental exploration of the phase diagram of this mismatched case, including the observation of phase separation between a fully paired core and the surrounding unpaired atoms (shown below).