Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 9: Solids at Low Temperature - Quantum Liquids, Bose-Einstein Condensates, Ultracold Atoms, ...

TT 9.1: Hauptvortrag

Freitag, 4. März 2005, 17:00–17:30, TU H3027

Ultracold Atoms in Optical Lattices: Tunable Quantum Many-Body Systems — •Walter Hofstetter — Theoretische Physik A, RWTH Aachen, Templergraben 55, 52056 Aachen

Cold atoms in optical lattices offer an exciting new laboratory where quantum many-body phenomena can be realized which are out of reach in solids. They can even serve as quantum simulators for notoriously difficult problems like high-temperature superconductivity. In this talk I will focus on recent developments and new results in multi-component systems: Fermionic atoms with SU(N) symmetry have exotic superfluid and flavor-ordered ground states. I will discuss symmetry breaking, collective modes and detection issues, e.g. in Bragg scattering. On the other hand, bosonic multi-flavor ensembles allow for engineering of quantum spin hamiltonians which are interesting from a quantum computation point of view. I will also discuss effects of reduced dimensionality, in particular polaronic Luttinger liquids in 1d Fermi-Bose systems.