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Dynamic Correlations in a Random Spin-1/2 XY Chain

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Verkholyak T., Derzhko O., Krokhmalskii T., Stolze J.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
441-444
EN
We examine dynamic quantities of a random spin-1/2 isotropic XY chain in a transverse field. The randomness is related to the sign of the nearest-neighbor exchange interaction and can be eliminated by a suitable transformation. As a result, the dynamic quantities for the random spin chain are related to the same dynamic quantities for the homogeneous spin chain. We use the available results for the latter model to discuss the effect of randomness on the dynamic structure factors of the quantum spin chain.
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Spin-1/2 XX Chains with Three-Spin Interactions

100%
Krokhmalskii T., Derzhko O., Verkholyak T., Stolze J.
Acta Physica Polonica A
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2008
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vol. 113
|
issue 1
437-440
EN
We consider a spin-1/2 XX chain with three-spin interactions which is equivalent to a system of noninteracting spinless fermions.We examine some dynamic quantities of the spin model.In particular, we calculate analytically the dynamic transverse (zz) structure factor which is governed by a two-fermion excitation continuum. Moreover, we compute numerically the dynamic xx structure factor which is a many-fermion dynamic quantity.We illustrate how the three-spin interactions manifest themselves in the dynamic probes.
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