Spin-1/2 XX Chains with Three-Spin Interactions |
| T. Krokhmalskii a, O. Derzhko a, J. Stolze b and T. Verkholyak a
a Institute for Condensed Matter Physics, NASU, 1 Svientsitskii Street, L'viv-11, 79011, Ukraine b Institut fűr Physik, Universität Dortmund, 44221, Dortmund, Germany |
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| Received: 9 07 2007; |
| 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. |
| DOI: 10.12693/APhysPolA.113.437 PACS numbers: 75.10.Jm, 75.40.Gb |