Quantum spin liquid near Mott transition with fermionized -vortices
Department of Physics, Beijing Normal University, Beijing, 100875, P.R. China
Corresponding author: a email@example.com
Revised: 31 March 2011
Published online: 25 May 2011
In this paper, we study the non-magnetic insulator state near Mott transition of 2D -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 mutual-Chern-Simons (MCS) theory is obtained to describe the low energy physics of NSL and TSL.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011