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Journal Articles Physical Review Letters Year : 2006

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

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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.

Dates and versions

ensl-00266542 , version 1 (24-03-2008)

Identifiers

Cite

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, 2006, 96 (257202), pp.257202. ⟨10.1103/PhysRevLett.96.257202⟩. ⟨ensl-00266542⟩
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