title: Quantum stabilization of the 1/3-magnetization plateau in Cs2CuBr4.
abstract: We consider the phase diagram of a spatially anisotropic 2D triangular antiferromagnet in a magnetic field. Classically, the ground state is umbrellalike for all fields, but we show that the quantum phase diagram is much richer and contains a 1/3-magnetization plateau, two commensurate planar states, two incommensurate chiral umbrella phases, and, possibly, a spin density wave state separating the two chiral phases. Our analysis sheds light on several recent experimental findings for Cs2CuBr4.
authors.affiliation: Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
authors.forename: Jason
authors.initials: J
authors.lastname: Alicea
authors.forename: Andrey V
authors.initials: AV
authors.lastname: Chubukov
authors.forename: Oleg A
authors.initials: OA
authors.lastname: Starykh