Functional renormalization group for the anisotropic triangular antiferromagnet

Abstract

We present a functional renormalization group scheme that allows us to calculate frustrated magnetic systems of arbitrary lattice geometry beyond O(200) sites from first principles. We study the magnetic susceptibility of the antiferromagnetic (AFM) spin-1/2 Heisenberg model ground state on the spatially anisotropic triangular lattice, where J' denotes the coupling strength of the intrachain bonds along one lattice direction and J the coupling strength of the interchain bonds. We identify three distinct phases of the Heisenberg model. Increasing xi=J'/J from the effective square lattice xi=0, we find an AFM Neel order to spiral order transition at xi_{c1} = 0.6-0.7, with indication to be of second order. In addition, above the isotropic point at xi_{c2} = 1.1, we find a first order transition to a magnetically disordered phase with collinear AFM stripe fluctuations.

4+e pages, 4 figures; 2 pages of supplementary material added (2 figures)

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