Dynamic response function in Ising systems below T-c
PHYSICAL REVIEW B, cilt.83, sa.9, 2011 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 83 Sayı: 9
- Basım Tarihi: 2011
- Doi Numarası: 10.1103/physrevb.83.094415
- Dergi Adı: PHYSICAL REVIEW B
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Akdeniz Üniversitesi Adresli: Evet
Özet
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.