Schwinger boson spin liquid states on square lattice

Understand

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.