Quantum Antiferromagnet on an Anisotropic Triangular Lattice

The effects of quantum fluctuations on the spin 1/2 Heisenberg antiferromagnet on a triangular lattice, with diagonal interchain exchange J' weaker than the intrachain exchange J, are studied. This model is of considerable interest because of its relevance to Cs2CuCl4, where experiments have been interpreted as evidence for a nearby two-dimensional spin liquid and because numerous theoretical studies have proposed that the incommensurate spiral spin density wave order is destroyed by quantum fluctuations well before the one-dimensional limit (J'=0) is reached.