Spin dynamics in the two-dimensional spin- 12 Heisenberg antiferromagnet
A. Fabricio Albuquerque, Antonio S. T. Pires, M. E. Gouvêa
We present low-temperature dynamic properties of the quantum two-dimensional antiferromagnetic Heisenberg model with spin $S=1∕2$. The calculation of the dynamic correlation function is performed by combining a projection operator formalism and the modified spin-wave theory, which gives a gap in the dispersion relation for finite temperatures. The so calculated dynamic correlation function shows a double peak structure. We also obtain the spin-wave damping and compare our results to some experimental data and theoretical results obtained by other authors using different approaches.
arXiv:cond-mat/0505458•Physical Review B•Nov 22, 2005•14 citations