Localization-delocalization transition in chains with long-range correlated disorder


Kaya T.

EUROPEAN PHYSICAL JOURNAL B, cilt.55, ss.49-56, 2007 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 55 Konu: 1
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1140/epjb/e2007-00036-4
  • Dergi Adı: EUROPEAN PHYSICAL JOURNAL B
  • Sayfa Sayıları: ss.49-56

Özet

We investigated numerically localization properties of electron eigenstates in a chain with long-range correlated diagonal disorder. A tight-binding one-dimensional model with on- site energies exhibiting long-range correlated disorder (LCD) was used with various disorder strength W. LCD was defined so that it gave a power-law spectral density of the form S(k) ak(-p), where p determines the roughness of the potential landscape. Numerical results on the correlation length. of eigenstates shows the existence of the localization-delocalization transition at p = 2. It is found that the critical values for disorder strength W-c and also the critical exponent. for localization length change with the values of p.