Seminar
Tuesday, 13 July, 2010
Group seminar LMU: An atomic colour superfluid via three-body loss
Tuesday, 13.07.2010 10 a.m. (s.t.) in H107, Fakultät für Physik LMU
Dr. Andrew J. Daley, Quantum Optics, Institute for Theoretical Physics
We discuss how three-body loss, which is ubiquitous and typically undesirable in cold gases experiments can be used to generate an effective three-body hard-core constraint, preventing three atoms from occupying the same lattice site. This mechanism not only serves to suppress the occurance of actual three-body losses, but generates interesting many-body physics due to the effective three-body interactions.
We first consider this mechanism in the context of bosonic atoms, where suppression of three-body occupation can stabilise the system with attractive two-body interactions, and gives rise to a superfluid phase of dimers. We then discuss the case of three-body loss in a three-component Fermi gas, where suppression of three-body occupation of lattice sites can stabilise phases with BCS pairing by suppressing the formation of trimers.
Via a master equation treatment, we study the full dynamics including loss, both to test how well real three-body losses are suppressed, and to determine schemes to produce interesting many-body states in the presence of loss. We treat the master equation essentially exactly for 1D systems by combining time-dependent DMRG techniques with quantum trajectories methods from quantum optics.