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Flat spin wave dispersion in a triangular antiferromagnet | | Oleg A. Starykh
; Andrey V. Chubukov
; Alexander G. Abanov
; | | Date: |
1 Aug 2006 | | Subject: | Strongly Correlated Electrons; Statistical Mechanics | | Abstract: | The excitation spectrum of a S=1/2 2D triangular quantum antiferromagnet is studied using 1/S expansion. Due to the non-collinearity of the classical ground state significant and non-trivial corrections to the spin wave spectrum appear already in the first order in 1/S in contrast to the square lattice antiferromagnet. The resulting magnon dispersion is almost flat in a substantial portion of the Brillouin zone. Our results are in quantitative agreement with recent series expansion studies by Zheng, Fjaerestad, Singh, McKenzie, and Coldea [PRL 96, 057201 (2006) and cond-mat/0608008]. | | Source: | arXiv, cond-mat/0608002 | | Services: | Forum | Review | PDF | Favorites | |
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