RVB gauge theory and the Topological degeneracy in the Honeycomb Kitaev model

Details RVB gauge theory and the Topological degeneracy in the Honeycomb Kitaev model RVB gauge theory and the Topological degeneracy in the Honeycomb Kitaev model

2011-11-16

arxiv.org/abs/1111.3813v2

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 3 figures. Added affiliation and a new section, 'Acknowledgements'.Typos corrected

Scientific paper

We relate the Z$_2$ gauge theory formalism of the Kitaev model to the SU(2) gauge theory of the resonating valence bond (RVB) physics. Further, we reformulate a known Jordan-Wigner transformation of Kitaev model on a torus in a general way that shows that it can be thought of as a Z$_2$ gauge fixing procedure. The conserved quantities simplify in terms of the gauge invariant Jordan-Wigner fermions, enabling us to construct exact eigen states and calculate physical quantities. We calculate the fermionic spectrum for flux free sector for different gauge field configurations and show that the ground state is four-fold degenerate on a torus in thermodynamic limit. Further on a torus we construct four mutually anti-commuting operators which enable us to prove that all eigenstates of this model are four fold degenerate in thermodynamic limit.

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