Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-09-02
Phys. Rev. B 79, 024402 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
19 pages, 11 eps-figures; added references
Scientific paper
10.1103/PhysRevB.79.024402
We consider the easy-plane anisotropic spin-1/2 Heisenberg chain in combined uniform longitudinal and transverse staggered magnetic fields. The low-energy limit of his model is described by the sine-Gordon quantum field theory. Using methods of integrable quantum field theory we determine the various components of the dynamical structure factor. To do so, we derive explicit expressions for all matrix elements of the low-energy projections of the spin operators involving at most two particles. We discuss applications of our results to experiments on one-dimensional quantum magnets.
Essler Fabian H. L.
Kuzmenko Igor
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