The magnetic-field-induced Feshbach resonance provides an unprecedented degree of control over the inter-particle interactions as well as the rate at which the interactions are changed. By sweeping magnetic field, one can tune the sign and the strength of the interaction and drive the system into various non-equilibrium states in which different bosonic and fermionic species co-exist and interact with each other. This leads to an amazing variety of new non-equilibrium phenomena, which are not accessible in usual condensed matter systems. In this talk I will discuss recent theoretical results on novel non-equilibrium states, which are possible in a Fermi gas close to a Feshbach resonance. I will show that under certain circumstances the system may show an internal AC Josephson effect leading to real time oscillations in the number of molecular bosons [Phys. Rev. A 72, 013612 (2005)]. I will also discuss the effect of stimulation of superfluidity by a periodic magnetic field. It will be shown that in a certain parameter regime, a new steady-state may occur in which the superfluid properties of the system are enhanced.

Last updated on Saturday, 01 April 2006 by Victor Yakovenko