Effects of defect on Ge(100) surface phase transitions

ESRA SIRMA

Effects of defect on Ge(100) surface phase transitions

Thesis Type: Postgraduate

Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2013

Student: ESRA SIRMA

Supervisor: BÜLENT KUTLU

Open Archive Collection: AVESIS Open Access Collection

Abstract:

In this study, critical behaviour of Ge(100) surfaces with %0, %1 and %2 defects is intestigated by using cooling algorithm which is improved from Creutz Cellular Automaton based on Ising Model. The simulation are carried on rectangular lattice with linear dimensions Lx×Ly=30×300, 60×600, 90×900 and 120×1200 using periodic boundry conditions. The investigations showed that to obtain dimer orientations agreement with experimental STM surface images, spin averages must be seperated with ? proportion. Infinite lattice critical temperatures corresponding to defects are obtained and compared with experimental and theoretical results. Finally, we show that surfaces with %2 defects is in good agreement with experimental STM surface image.