https://doi.org/10.1140/epjb/e2011-10992-5
Quantum spin liquid near Mott transition with fermionized
-vortices
Department of Physics, Beijing Normal University, Beijing, 100875, P.R. China
Corresponding author: a spkou@mit.edu
Received:
18
December
2010
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