Quasiparticles of spatially anisotropic triangular antiferromagnets in a magnetic field

Details Quasiparticles of spatially anisotropic triangular antiferromagnets in a magnetic field Quasiparticles of spatially anisotropic triangular antiferromagnets in a magnetic field

2009-09-23

arxiv.org/abs/0909.4283v2

Phys. Rev. Lett. 103, 197203 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.103.197203

The spectral properties of the spin-1/2 Heisenberg antiferromagnet on an anisotropic triangular lattice in a magnetic field are investigated using a weak-interchain-coupling approach combined with exact solutions of a chain. Dominant modes induced by interchain interactions in a magnetic field behave as quasiparticles which show distinctive features such as anomalous incommensurate ordering and high-energy modes. In terms of them, various unusual features observed in the anisotropic triangular antiferromagnet Cs_2CuCl_4 in a magnetic field are quantitatively explained in a unified manner.

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