Quantum stabilization of 1/3-magnetization plateau in Cs₂CuBr₄

2008/09/22 by Jason Alicea, Andrey V. Chubukov, Oleg A. Starykh
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.102.137201

published as Phys. Rev. Lett. 102, 137201 (2009) · 4+ pages, 2 figures

arxiv created 2008/09/22 · arxiv updated 2009/12/01

Abstract

We consider the phase diagram of a spatially anisotropic 2D triangular antiferromagnet in a magnetic field. Classically, the ground state is umbrella-like 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 planar state separating the two chiral phases. Our analysis sheds light on several recent experimental findings for the spin-1/2 system Cs₂CuBr₄.

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