Seminar
Tuesday, 16 March, 2010
Group Seminar LMU: Controlled hole-doping of a Mott insulator of fermionic atoms and frustrated quantum antiferromagnetism in a dressed optical lattice.
Tuesday, 16.03.2010 10 a.m. (s.t.) in H107, Fakultät für Physik LMU
André Eckardt, ICFO-Institut de Ciències Fotòniques, Barcelona, Spain
One of the major motivations for doing experiments with ultracold atoms is the idea of quantum simulation. That is, to create a quantum system in the laboratory that is a clean and tunable realization of a paradigmatic many-body Hamiltonian. The most interesting models to be "simulated" by a cold atom system are, of course, those that are hard to treat theoretically. The latter is the case if (i) several candidate phases stand in fierce competition to each other such that variational (or meanfield) approaches are rendered unreliable, and if (ii) also powerful numerical methods (Quantum Montecarlo simulations) are not available. I will talk about two recent proposals dealing with cold-atom realization of such models. The first one concerns the t-J model describing a doped fermionic Mott insulator and being conjectured to feature high-temperature d-wave superconductivity. Here, our idea is to mimic hard-to-control hole-doping by boson doping [Eckardt & Lewenstein, arXiv:1001.1918]. The second proposal is devoted to the realization of a frustrated quantum antiferromagnet in a triangular lattice that is dressed by off-resonant elliptical forcing [Eckardt et al., EPL 89, 10010 (2010)].