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Quantum spin liquid with fermionized pi-vortices

In this paper, we study the non-magnetic insulator state near Mott transition of 2D pi-flux Hubbard model on square lattice and find that such non-magnetic insulator state is quantum spin liquid state with nodal fermionic excitations - nodal spin liquid (NSL). When there exists small easy-plane anisotropic energy, the ground state becomes Z2 topological spin liquid (TSL) with full gapped excitations. The U(1)times U(1) mutual--Chern-Simons (MCS) theory is obtained to describe the low energy physics of NSL and TSL.

preprint2010arXivOpen access
Su-Peng KouLan-Feng LiuJing HeYa-Jie Wu
cond-mat.supr-concond-mat.str-el
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Su-Peng KouLan-Feng LiuJing HeYa-Jie Wu

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