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Q: Quantenoptik und Photonik
Q 5: Stark korrelierte Systeme
Q 5.2: Vortrag
Montag, 13. März 2006, 11:55–12:10, HII
Inducing frustration in optical lattices — •Juan Jose Garcia-Ripoll1 and Jiannis Pachos2 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, Garching b. München, Germany — 2DAMTP, Center for Mathematical Sciences, Wilberforce Road, Cambridge, CB3 0WA, United Kingdom
In this work we consider a simple model of cold bosonic atoms trapped in 1D optical lattices, and design a setup to induce frustration by means of Raman-assisted tunneling. We have studied numerically and analytically the quantum phases of this system and found that, apart from the Mott-Insulator to superfluid transition, there appear additional phase transitions into gapped phases with localized atoms and short-range correlations, similar to a Bose-glass. We speak then of a breakdown of superfluidity due to the frustration.