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Anomalous excitation spectra of frustrated quantum antiferromagnets.

Abstract:

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 Néel phase, the deviations from LSWT increase sharply with frustration, leading to rotonlike minima at special wave vectors. We argue that these results can be interpreted naturally in a spinon langu...

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Publication status:
Published

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Authors


Fjaerestad, JO More by this author
McKenzie, RH More by this author
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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Condensed Matter Physics
Journal:
Physical review letters
Volume:
96
Issue:
5
Pages:
057201
Publication date:
2006-02-05
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:41dd32c4-a899-408c-94c5-1714c7f437f2
Source identifiers:
155848
Local pid:
pubs:155848
Language:
English
Keywords:

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