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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.40: Poster

Wednesday, April 2, 2014, 15:00–19:00, P2

Bond randomness in Kitaev's honeycomb spin-liquid model — •Fabian Zschocke and Matthias Vojta — Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany

The Kitaev model on the honeycomb lattice realizes a spin liquid whose emergent excitations are gapless Majorana fermions and static Z2 gauge fluxes. Upon introduction of bond randomness the model remains exactly solvable, via an equivalent tight-binding model of canonical fermions. We use this to study a number of observables as function of disorder strength, paying particular attention to properly selecting physical states within the canonical-fermion description. Specifically, we calculate the distribution of local susceptibilities, extract the NMR lineshape, and make contact with known results on the problem of disordered Dirac fermions.