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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster: Quantum Optics and Photonics I

Q 15.17: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Time-dependant isospin correlations in two-partite hexagonal optical lattices — •Holger Niehus, Eva-Maria Richter, Marta Prada, and Daniela Pfannkuche — I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstr. 9, 20355 Hamburg, Deutschland

Multi-component systems of ultracold quantum gases in optical lattices have shown a variety of new and interesting quantum phases. A simple system for investigating (iso-)magnetic phases is a two-component mixture, modeled by a Bose-Hubbard Hamiltonian with component interaction of the form Ĥ_int = ∑_i V n_Aⁱ n_Bⁱ. Employing exact numerical methods and mapping occupation differences of the two components to an effective spin, we were able to calculate iso-magnetic correlations. This enabled us to identify and characterise the different phases of the system on the full range of Hubbard interaction parameters [1].

Recently there has been a growing interest in the dynamics of systems far from equilibrium. Here, we study the dynamics of the two-component system with regard to sudden changes in the interaction strengths. The time evolution of the iso-magnetic correlations will be analyzed with respect to characteristic low energy excitations.

[1] M. Prada, E.-M. Richter, D. Pfannkuche, Phys. Rev. A. 90, 013613 (2014).