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Phys Rev Lett. 2005 Jul 15;95(3):036403. Epub 2005 Jul 15.

U(1) gauge theory of the Hubbard model: spin liquid states and possible application to kappa-(BEDT-TTF)2Cu2(CN)3.

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Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.


We formulate a U(1) gauge theory of the Hubbard model in the slave-rotor representation. From this formalism it is argued that spin liquid phases may exist near the Mott transition in the Hubbard model on triangular and honeycomb lattices at half filling. The organic compound kappa-(BEDT-TTF)2Cu2(CN)3 is a good candidate for the spin liquid state on a triangular lattice. We predict a highly unusual temperature dependence for the thermal conductivity of this material.

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