Dynamic response function in Ising systems below T-c

Pawlak A., ERDEM R.

PHYSICAL REVIEW B, vol.83, no.9, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 83 Issue: 9
  • Publication Date: 2011
  • Doi Number: 10.1103/physrevb.83.094415
  • Journal Name: PHYSICAL REVIEW B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Akdeniz University Affiliated: Yes

Abstract

With the aid of Nelson's method we derive expressions for the frequency-, momentum-, and temperature-dependent response function below a critical point in the Ising-type system. The scaling function is given within the renormalization-group formalism at one-loop order for zero external field. The comparison with the corresponding expressions above T-c and with the mean-field approximation is made. We also discuss the dynamic correlation function, focusing on the deviations from the Gaussian expression. The comparison with field-theoretical calculations is also given.