Phys. Rev. Lett. 103, 197203 (2009) [4 pages]Quasiparticles of Spatially Anisotropic Triangular Antiferromagnets in a Magnetic FieldReceived 18 November 2008; revised 22 September 2009; published 4 November 2009 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 Cs2CuCl4 in a magnetic field are quantitatively explained in a unified manner. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.197203
DOI:
10.1103/PhysRevLett.103.197203
PACS:
75.10.Jm, 75.40.Gb, 75.50.Ee
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