Microscopic models for Kitaev's sixteenfold way of anyon theories

• URL: http://arxiv.org/abs/2005.13683v2
• Date: Wed, 11 Nov 2020 20:21:56 GMT
• Title: Microscopic models for Kitaev's sixteenfold way of anyon theories
• Authors: Sreejith Chulliparambil, Urban F. P. Seifert, Matthias Vojta, Lukas Janssen, Hong-Hao Tu
• Abstract summary: In two dimensions, the topological order described by $mathbbZ$ gauge theory is classified by $nu ; mathrmmod; 16$ as predicted by Kitaev. Here we provide a systematic and complete construction of microscopic models realizing this so-called sixteenfold way of anyon theories.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In two dimensions, the topological order described by $\mathbb{Z}_2$ gauge theory coupled to free or weakly interacting fermions with a nonzero spectral Chern number $\nu$ is classified by $\nu \; \mathrm{mod}\; 16$ as predicted by Kitaev [Ann. Phys. 321, 2 (2006)]. Here we provide a systematic and complete construction of microscopic models realizing this so-called sixteenfold way of anyon theories. These models are defined by $\Gamma$ matrices satisfying the Clifford algebra, enjoy a global $\mathrm{SO}(\nu)$ symmetry, and live on either square or honeycomb lattices depending on the parity of $\nu$. We show that all these models are exactly solvable by using a Majorana representation and characterize the topological order by calculating the topological spin of an anyonic quasiparticle and the ground-state degeneracy. The possible relevance of the $\nu=2$ and $\nu=3$ models to materials with Kugel-Khomskii-type spin-orbital interactions is discussed.

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