The dynamical spin structure factor for the anisotropic spin-1/2 Heisenberg chain

Abstract : The longitudinal spin structure factor for the XXZ-chain at small wave-vector q is obtained using Bethe Ansatz, field theory methods and the Density Matrix Renormalization Group. It consists of a peak with peculiar, non-Lorentzian shape and a high-frequency tail. We show that the width of the peak is proportional to q^2 for finite magnetic field compared to q^3 for zero field. For the tail we derive an analytic formula without any adjustable parameters and demonstrate that the integrability of the model directly affects the lineshape.
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Physical Review Letters, American Physical Society, 2006, 96 (257202), pp.257202. 〈10.1103/PhysRevLett.96.257202〉
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https://hal-ens-lyon.archives-ouvertes.fr/ensl-00266542
Contributeur : Jean Michel Maillet <>
Soumis le : lundi 24 mars 2008 - 16:55:44
Dernière modification le : dimanche 29 avril 2018 - 11:56:02

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R. G. Pereira, J. Sirker, J. -S. Caux, R. Hagemans, Jean Michel Maillet, et al.. The dynamical spin structure factor for the anisotropic spin-1/2 Heisenberg chain. Physical Review Letters, American Physical Society, 2006, 96 (257202), pp.257202. 〈10.1103/PhysRevLett.96.257202〉. 〈ensl-00266542〉

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