Condensed Matter Physics Seminar

2 p.m., Thursday, October 17, 2002
Room 1201, Physics Building

 Spin waves in a dilute spin-1/2 Bose gas

James Williams

(NIST - Gaithersburg)

Abstract:  An ultra-cold Bose gas of two level atoms can be thought of as a spin-1/2 Bose gas. It supports spin wave collective modes due to the exchange mean field. Such collective spin oscillations have been observed in recent experiments at JILA with Rb-87 atoms confined in a harmonic trap above the transition temperature Tc for Bose-Einstein condensation. We present the kinetic theory for this system, both above and below Tc. We compare our calculations of the collective mode frequencies and damping rates to experimental data and find excellent agreement. Finally, we give a summary of possible extensions of this work, for example, to an ultra-cold Fermi gas of two level atoms.
Host:  Das Sarma
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