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Q: Fachverband Quantenoptik und Photonik

Q 7: Quantengase: Bosonen im Gitter I

Q 7.7: Talk

Monday, March 2, 2009, 15:30–15:45, VMP 6 HS-A

Valence Bond States : Link models and scattering experiments — Enrique Rico¹, •Robert Hübener^2,3, Simone Montangero^4,5, Niall Moran⁶, Bogdan Pirvu¹, Jiri Vala^6,7, and Hans Briegel^2,3 — ¹Fakultät für Physik, Universität Wien, Austria — ²ITP, Universität Innsbruck, Austria — ³IQOQI Innsbruck, Austria — ⁴Institut für Quanteninformationsverarbeitung, Universität Ulm, Germany — ⁵NEST-CNR-INFM and Scuola Normale Superiore, Pisa, Italy — ⁶National University of Ireland, Maynooth, Ireland — ⁷Dublin Institute for Advanced Studies, Ireland

An isotropic anti-ferromagnetic quantum state on a two-dimensional square lattice is characterized by symmetry arguments only. By construction, this quantum state is the result of an underlying valence bond structure without breaking any symmetry in the lattice or spin spaces. The physical relevance of the model is motivated. A comparison of the model to known anti-ferromagnetic Mott-Hubbard insulators is given by means of the two-point equal-time correlation function obtained i) numerically from the suggested state and ii) experimentally from neutron scattering on cuprates in the anti-ferromagnetic insulator phase. Ref: arXiv:0811.1049