An alternative method for the exact calculation of Wannier-Stark localization in superlattices

Ergun Y., Amca R., Sokmen I., Sari H., Balkan N.

SUPERLATTICES AND MICROSTRUCTURES, cilt.29, sa.1, ss.73-81, 2001 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 29 Sayı: 1
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1006/spmi.2000.0923
  • Dergi Adı: SUPERLATTICES AND MICROSTRUCTURES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.73-81
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

We present an alternative method for the exact calculations of the Wannier-Stark (WS) localization in a long periodic potential corresponding to a (50 Angstrom /30 Angstrom) GaAs/Ga0.7Al0.3As superlattice. We show that the electric field dependence of the electron wavefunction has unique localization dynamics. One interesting prediction is a small effect involving the change of the dipole field with increasing WS field. It is argued that this may give rise to parasitic effects in Bloch oscillations and, therefore, to noise in coherent terahertz emission. (C) 2001 Academic Press.