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Title: Numerical study of incommensurability of the spiral state on spin-1/2 spatially anisotropic triangular antiferromagnets using entanglement renormalization
Authors: Harada, Kenji  kyouindb  KAKEN_id
Author's alias: 原田, 健自
Issue Date: 16-Nov-2012
Publisher: American Physical Society
Journal title: Physical Review B
Volume: 86
Issue: 18
Thesis number: 184421
Abstract: The ground state of an S=1/2 antiferromagnetic Heisenberg model on a spatially anisotropic triangular lattice, which is an effective model of Mott insulators on a triangular layer of organic charge transfer salts or Cs[2]CuCl[4], is numerically studied. We apply a numerical variational method by using a tensor network with entanglement renormalization, which improves the capability of describing a quantum state. Magnetic ground states are identified for 0.7≤J[2]/J[1]≤1 in the thermodynamic limit, where J1 and J2 denote the innerchain and interchain coupling constants, respectively. Except for the isotropic case (J[1]=J[2]), the magnetic structure is spiral with an incommensurate wave vector that is different from the classical one. The quantum fluctuation weakens the effective coupling between chains, but the magnetic order remains in the thermodynamic limit. In addition, the incommensurate wave number is in good agreement with that of the series expansion method.
Rights: ©2012 American Physical Society
DOI(Published Version): 10.1103/PhysRevB.86.184421
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