Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: CE: Low-dimensional Systems - Models 1
TT 30.7: Talk
Thursday, March 25, 2010, 11:15–11:30, H20
Family of exactly solvable models with ultimate co-operative paramagnetic ground state — •Kai Phillip Schmidt1 and Mukul Laad1,2 — 1Lehrstuhl für Theoretische Physik I, Otto-Hahn-Strasse 4, TU Dortmund, 44221 Dortmund, Germany — 2Institut für Theoretische Physik, RWTH Aachen, 52056 Aachen, Germany
We present a family of two-dimensional frustrated quantum magnets solely based on pure nearest-neighbor Heisenberg interactions which can be solved quasi-exactly. All lattices are constructed in terms of frustrated quantum cages containing a chiral degree of freedom protected by frustration. The ground states of these models are dimer analogs of ultimate co-operative paramagnets and exhibit an extensive entropy at zero temperature. We discuss the unusual and extensively degenerate excitations in such phases. Implications for thermodynamic properties as well as for decoherence free quantum computation are discussed.