Journal
ACTA PHYSICA POLONICA A
Volume 113, Issue 1, Pages 437-440Publisher
POLISH ACAD SCIENCES INST PHYSICS
DOI: 10.12693/APhysPolA.113.437
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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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