Dynamic properties of quantum spin chains: Simple route to complex behavior

Details Dynamic properties of quantum spin chains: Simple route to complex behavior Dynamic properties of quantum spin chains: Simple route to complex behavior

2008-02-04

arxiv.org/abs/0802.0389v1

Phys. Rev. B 76, 144418 (2007) (11 pages)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.76.144418

We examine dynamic structure factors of spin-1/2 chains with nearest-neighbor interactions of XX and Dzyaloshinskii-Moriya type, and with periodic and random changes in the sign of these interactions. This special kind of inhomogeneity can be eliminated from the Hamiltonian by suitable transformation of the spin variables. As a result, the dynamic structure factors of periodic or random chains can be computed from those of the uniform chains. Using the exact analytical and precise numerical results available for the uniform systems we illustrate the effects of regular alternation or random disorder on dynamic structure factors of quantum spin chains.

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