Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 19: Quantum Liquids, Miscellaneous 2

TT 19.3: Talk

Monday, March 11, 2013, 15:30–15:45, H21

Fractional charge separation in the hard-core Bose Hubbard Model on the Kagome Lattice — •Xuefeng Zhang and Sebastian Eggert — Department of the Physics,Univ. Kaiserslautern, Kaiserslautern, Germany

We consider the hard core Bose Hubbard Model on a Kagome lattice with fixed (open) boundary conditions on two edges. We find that the fixed boundary conditions lift the degeneracy and freeze the system at 1/3 and 2/3 filling at small hopping. At larger hopping strengths, fractional charges spontaneously separate and are free to move to the edges of the system, which leads to a novel compressible phase with solid order. The compressibility is due to excitations on the edge which display a chiral symmetry breaking that is reminiscent of the quantum Hall effect. Large scale Monte Carlo simulations confirm the analytical calculations.