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Schwinger boson spin liquid states on square lattice

We study possible spin liquids on square lattice that respect all lattice symmetries and time-reversal symmetry within the framework of Schwinger boson (mean-field) theory. Such spin liquids have spin gap and emergent Z_2 gauge field excitations. We classify them by the projective symmetry group method, and find six spin liquid states that are potentially relevant to the J_1-J_2 Heisenberg model. The properties of these states are studied under mean-field approximation. Interestingly we find a spin liquid state that can go through continuous phase transitions to either the Néel magnetic order or magnetic orders of the wavevector at Brillouin zone edge center. We also discuss the connection between our results and the Abrikosov fermion spin liquids.

preprint2016arXivOpen access
Xu YangFa Wang
cond-mat.str-el
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Xu YangFa Wang

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