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Q: Fachverband Quantenoptik und Photonik

Q 46: Quantengase: Optische Gitter 4

Q 46.2: Vortrag

Donnerstag, 15. März 2012, 14:15–14:30, V53.01

Chiral and hidden ordered phases of ultracold bosonic atoms in zig-zag lattice geometries — •Sebastian Greschner, Temo Vekua, and Luis Santos — Institut für theoretische Physik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany

Recent experimental advances in controlling motional degrees of freedom of ultracold bosonic atoms in triangular lattices have opened the possibility of simulation of frustrated quantum antiferromagnetism. In this context we discuss properties of ultracold bosonic atoms in a quasi one dimensional frustrated zig-zag lattice geometry, which exhibit a rich ground state quantum phase diagram including chiral superfluid and chiral insulators. We present numerical and field theoretical results, that show that due to the frustration induced by the zig-zag geometry, even very small interactions will immediately lead to insulating phases. Furthermore in this setup an effective three-body hard-core interaction, which has been been shown to be induced by strong dissipative processes, may lead to the emergence of a Haldane-insulator phase for bosons even in the absence of long range dipolar interactions. In the presence of dipolar interactions further non-trivial phases are formed, including a double-Haldane phase.