UConn Physics Colloquium
Pairing in a Gas of Atomic Fermions
Physics and Astronomy Department
Recent progress in cooling atomic Fermi gasses has demonstrated their value for realizing some of the paradigm models of condensed matter physics. Many of the parameters of trapped atomic gases, including their density, temperature, and interaction strength and sign, can all be controlled with high precision.
I will discuss the cooling an atomic Fermi gas of 6Li atoms to quantum degeneracy and the realization of a strongly interacting Fermi gas by use of a magnetically-tunable collisional Feshbach resonance (an idea originated by Bill Stwalley). We have created a Bose--Einstein condensate (BEC) of atomic pairs and have used the condensate as a starting point to explore the BEC/BCS crossover that occurs at the Feshbach resonance. Optical molecular spectroscopy was used to measure the local pair correlations in both the BEC and the BCS regimes. This technique provides a quantitative measurement of the microscopic physics of the Feshbach-induced pairs.
Friday, September 2, 2005
(We will meet for refreshments prior to the talk at 3:30 p.m., in the Gant Science Complex, Physics Library, Room P-103.)