Dynamic Properties of Spin-1/2 XX Chain with Three-Site Interactions of (XZY - YZX)-Type
M. Topilko, O. Derzhko and T. Krokhmalskii
Institute for Condensed Matter Physics, NAS of Ukraine, 1 Svientsitskii Str., L'viv-11, 79011, Ukraine
Received: November 9, 2010
Full Text PDF
We consider the spin-1/2 isotropic XY chain in a transverse field with three-site interactions of (XZY - YZX)-type, which can be transformed into a system of noninteracting spinless fermions. We study dynamic properties of the spin model. In particular, we calculate the dynamic structure factors which are governed by a two-fermion excitation continuum. We demonstrate how the three-site interactions manifest themselves in the dynamic properties of the quantum spin chain.
DOI: 10.12693/APhysPolA.119.868
PACS numbers: 75.10.Jm, 75.40.Gb