Mean-field theory of spin-liquid states with finite energy gap and topological orders.
@article{Wen1991MeanfieldTO,
title={Mean-field theory of spin-liquid states with finite energy gap and topological orders.},
author={Wen},
journal={Physical review. B, Condensed matter},
year={1991},
volume={44 6},
pages={
2664-2672
}
}The mean-field theory of a T- and P-symmetric spin-liquid state is developed. The quasiparticle excitations in the spin-liquid state are shown to be spin-1/2 neutral fermions (the spinons) and charge e spinless bosons (the holons). The spin-liquid state is shown to be characterized by a nontrivial topological order. Although our discussions are based on the mean-field theory, the concept of the topological order and the associated universal properties (e.g., the quantum number of the…
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Baskaran also studied some mean field theories which completely break the SU (2) gauge symmetry. G. Baskaran private communication