Golinelli, O.; Jolicœur, Th.; Sørensen, E.S. - In: The European Physical Journal B - Condensed Matter and … 11 (1999) 2, pp. 199-206
We study the magnetic excitation spectrum of the spin-1 chain with Hamiltonian <Emphasis FontCategory="NonProportional">H=Σ<Subscript> i </Subscript> cos θ <Emphasis Type="Bold">S <Subscript> i </Subscript> · <Emphasis Type="Bold">S <Subscript> i+1</Subscript> + sin θ(<Emphasis Type="Bold">S <Subscript> i </Subscript> · <Emphasis Type="Bold">S <Subscript> i+1</Subscript>)<Superscript>2</Superscript>. We focus on the range 0 ≤ θ ≤ + π/4 where the spin chain is in the gapped Haldane phase. The excitation spectrum and static structure factor is studied...</superscript></subscript></emphasis></subscript></emphasis></subscript></emphasis></subscript></emphasis></subscript></emphasis>
