TY - JOUR
T1 - Flat spin-wave dispersion in a triangular antiferromagnet
AU - Starykh, Oleg A.
AU - Chubukov, Andrey V.
AU - Abanov, Alexander G.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2006
Y1 - 2006
N2 - The excitation spectrum of an S=1 2 two-dimensional triangular quantum antiferromagnet is studied using 1 S expansion. Due to the noncollinearity of the classical ground state significant and nontrivial 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 [Phys. Rev. Lett. 96, 057201 (2006); cond-mat/0608008 (unpublished)].
AB - The excitation spectrum of an S=1 2 two-dimensional triangular quantum antiferromagnet is studied using 1 S expansion. Due to the noncollinearity of the classical ground state significant and nontrivial 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 [Phys. Rev. Lett. 96, 057201 (2006); cond-mat/0608008 (unpublished)].
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U2 - 10.1103/PhysRevB.74.180403
DO - 10.1103/PhysRevB.74.180403
M3 - Article
AN - SCOPUS:33750997013
VL - 74
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 18
M1 - 180403
ER -