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ID 46880
本文ファイル
著者
Caux, Jean-Sébastien
Konno, Hitoshi
Sorrell, Mark
Weston, Robert
NDC
物理学
抄録(英)
We consider the XXZ quantum spin chain in its massless, disordered regime at zero field. We derive an exact expression for the two-spinon form-factor of Sz = 1/2σz by taking a limit of the massive XYZ form-factors found by Lashkevich and by Lukyanov and Terras. This result is used to find the two-spinon contribution to the spectral decomposition of the longitudinal structure factor Szz(k, w). We find that this contribution provides an accurate approximation to the full structure factor over a wide range of the anisotropy parameter. The asymptotic behaviour of Szz(k, w) is computed as the upper and lower w thresholds of the two-spinon (w, k) band are approached, and an analysis of the region of validity of this threshold behaviour is performed. Our results reproduce and refine existing threshold behaviour predictions and extend these results to an accurate description throughout the two-spinon continuum.
掲載誌名
Journal of Statistical Mechanics: Theory and Experiment
2012巻
開始ページ
P01007
出版年月日
2012-01-16
出版者
IOP Publishing Ltd
ISSN
1742-5468
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
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関連情報URL
部局名
理学研究科