Dynamic Phase Transitions, Photocurrents and Exotic Quantum Phases in Ultracold Atom Systems
Speaker: Ludwig Mathey, University of Hamburg
Department: Electrical Engineering
Location: Engineering Quadrangle B327
Date/Time: Tuesday, July 23, 2013, 12:00 p.m. - 1:00 p.m.
In this talk I present several recent projects on many-body effects in ultra cold atom systems. These versatile systems can be used to study phase transitions and ordering in a well-controlled environment. A recent joint experimental and theoretical study of the fully frustrated triangular lattice realizes a phase transition in which a chiral order is generated. This order can be controlled via an artificial gauge field, created via lattice shaking. In another joint recent work we create the equivalent of photocurrents in a lattice, and map out the dynamics of both the fermions and the holes via band mapping. The dynamics can be understood with a semi-classical description of a generalized pendulum equation. Furthermore, we propose to investigate the quantum phases of dipolar Fermi gases in optical lattices. In particular, we predict a novel bond order solid phase, that can be realized under realistic conditions. Finally we propose to induce dynamic phase transition in these systems, in particular a dynamic Kosterlitz Thouless transition. Its time evolution can be detected via matter wav interferometry, and can be theoretically understood with a real-time renormalization group approach.