Time reversal symmetric Kitaev model and topological superconductor

We study a time reversal symmetric quantum spin model in two dimensions that is introduced as a higher spin extension of the Kitaev model and is exactly solvable [1]. The ground state of the topological phase of this model can be viewed as a time reversal symmetric topological superconductor in two dimensions. The helical Majorana edge modes which appear in time reversal pair in the topological phase are explained by topological argument. The correlation functions along the edge are derived from the gapless edge theory.\\[4pt] [1] R. Nakai, S. Ryu, and A. Furusaki, arXiv:1111:1230.