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We consider the phase diagram of a spatially anisotropic 2D triangularantiferromagnet in a magnetic field. Classically, the ground state isumbrella-like for all fields, but we show that the quantum phase diagram ismuch richer and contains a 1/3 magnetization plateau, two commensurate planarstates, two incommensurate chiral umbrella phases, and, possibly, a planarstate separating the two chiral phases. Our analysis sheds light on severalrecent experimental findings for the spin-1/2 system Cs_2CuBr_4.

Quantum stabilization of 1/3-magnetization plateau in Cs_2CuBr_4