Quantum spin liquid with fermionized pi-vortices

Details Quantum spin liquid with fermionized pi-vortices Quantum spin liquid with fermionized pi-vortices

2009-10-12

arxiv.org/abs/0910.2070v2

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

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.

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