Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets

Details Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets

2005-06-16

arxiv.org/abs/cond-mat/0506400v2

Phys. Rev. Lett. 96, 057201 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures. New Fig. 3 with higher-order series data, paper shortened, references updated, one added (Ref. 28), minor

Scientific paper

10.1103/PhysRevLett.96.057201

We use series expansions to study the excitation spectra of spin-1/2 antiferromagnets on anisotropic triangular lattices. For the isotropic triangular lattice model (TLM) the high-energy spectra show several anomalous features that differ strongly from linear spin-wave theory (LSWT). Even in the Neel phase, the deviations from LSWT increase sharply with frustration, leading to roton-like minima at special wavevectors. We argue that these results can be interpreted naturally in a spinon language, and provide an explanation for the previously observed anomalous finite-temperature properties of the TLM. In the coupled-chains limit, quantum renormalizations strongly enhance the one-dimensionality of the spectra, in agreement with experiments on Cs_2CuCl_4.

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