Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.52: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Possible gapless spin liquid in the Kagome Lattice — •Xue-Feng Zhang and Sebastian Eggert — Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern, Germany

We studied the Hard-Core Bose-Hubbard Model with nearest neighbor repulsion. In the solid phase, we find a new representation to describe the degeneracy of the ground state. By using the Strong Coupling Expansion and the Quantum Monte Carlo simulation, we got the solid melting critical lines for both positive and negative hopping process. And such phase transitions are induced by the fractional charge excitation.

Considering the superfluid and solid phase respectively break different symmetry, we think such second order melting process would not happen between them and the gapless spin glass intermediate phase may exist there.