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Exact chiral spin liquid state in a Kitaev type spin model

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arxiv 1908.03123 v3 pith:H5SA2NL7 submitted 2019-08-08 cond-mat.str-el

Exact chiral spin liquid state in a Kitaev type spin model

classification cond-mat.str-el
keywords modelspinlatticechiralmodestategroundkitaev
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study a frustrated two-dimensional lattice spin model with Kitaev type interaction. The lattice is obtained from the honeycomb lattice by replacing half of its sites with triangles. Using the SO(3) Majorana representation of spin, the model is exactly mapped into a $Z_{2}$ lattice gauge theory of complex fermions with standard Gauss law constraint. We show that the ground state of the model is a chiral spin liquid, and it has gapless excitations. The Chern number of the ground state is $\pm 1$, implying the existence of chiral edge mode. The vortex excitation of the model is bound with a Majorana zero mode, such mode behaves as non-Abelian anyons.

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