Condensed Matter Physics Seminar

2 p.m., Thursday, February 8, 2007
Room 1201, Physics Building

 Dynamical vanishing and persistent oscillations of the order parameter in fermionic condensates

Emil Yuzbashyan


Abstract:  I will discuss the dynamics of a condensate of ultra-cold atomic fermions following an abrupt change of the pairing strength. At long times the system goes to a non-stationary steady state, which we determine exactly. Two peculiar "dynamical phase transitions" are present. When the coupling is decreased below a certain threshold, the order parameter vanishes exponentially in time. In this case, the steady state of the system is a novel gapless superfluid state. On the other hand, if the coupling is increased above a certain critical value, the order parameter displays persistent periodic oscillations. I will also discuss the experimental signatures of the novel states.
Host:  Galitski
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