フルヤ　シュンスケ   FURUYA Shunsuke   古谷　峻介    所属   埼玉医科大学  医学部 教養教育    職種   専任講師
論文種別	学術雑誌(原著)
言語種別	英語
査読の有無	査読あり
表題	Semiclassical approach to electron spin resonance in quantum spin systems
掲載誌名	正式名：PHYSICAL REVIEW B ISSNコード：2469-9950/2469-9969
出版社	AMER PHYSICAL SOC
巻・号・頁	83(22)
著者・共著者	Shunsuke C. Furuya,Masaki Oshikawa,Ian Affleck
発行年月	2011/06
概要	We develop a semiclassical approximation to electron spin resonance in quantum spin systems, based on the rotor or nonlinear sigma model. The classical time evolution is studied using molecular dynamics while random initial conditions are sampled using classical Monte Carlo methods. Although the approximation may be especially powerful in two dimensions, we apply it here to one-dimensional systems of large spin at intermediate temperatures in the presence of staggered and uniform magnetic fields. We first test the validity of the semiclassical approximation by comparing the magnetization to quantum Monte Carlo results on S = 2 chains. Then we calculate the ESR spectrum, finding broad coexisting paramagnetic and spin-wave resonances.
DOI	10.1103/PhysRevB.83.224417
arXiv ID	arXiv:1102.3239
PermalinkURL	http://arxiv.org/abs/1102.3239v1