We modify the conventional Mitsui model by including the terms related to piezoelectric coupling with shear strain 4 . The static and dynamic dielectric, piezoelectric, and elastic characteristics of a Rochelle salt crystal are calculated. It is shown that taking into account piezoelectric effects yields a correct temperature behavior of the relaxation times and the dynamic dielectric permittivity of the Rochelle salt in the vicinity of the transition points.
We consider the spin- anisotropic XY chain in a transverse (z) field with the Dzyaloshinskii-Moriya interaction directed along z-axis in spin space to examine the effect of the Dzyaloshinskii-Moriya interaction on the zz, xx and yy dynamic structure factors. Using the Jordan-Wigner fermionization approach we analytically calculate the dynamic transverse spin structure factor. It is governed by a two-fermion excitation continuum. We analyze the effect of the Dzyaloshinskii-Moriya interaction on the two-fermion excitation continuum. Other dynamic structure factors which are governed by many-fermion excitations are calculated numerically. We discuss how the Dzyaloshinskii-Moriya interaction manifests itself in the dynamic properties of the quantum spin chain at various fields and temperatures.
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