How do atomic steps behave on vicinal surfaces? This paper explores step-height doubling transitions, focusing on Ge(111)-[12̄1] and Si(001)-[110] surfaces. The analysis considers the symmetry between alternate terraces, with evidence suggesting an Ising character for Ge(111)-[12̄1]. For Si(001)-[110], one subset of terraces is favored, implying a first-order phase transition if it occurs. The research delves into the thermodynamic properties of these surfaces, including the potential for phase transitions. It explores the interplay between temperature, misorientation, and step coalescence, contributing to the understanding of surface physics. This theoretical investigation enhances our grasp of vicinal surface behavior, paving the way for potential advancements in materials science and nanotechnology, where precise control of surface structures is crucial. Further investigation into step coalescence and the properties of multi-layered atomic steps holds promise for future innovations.
Published in the Journal of Vacuum Science & Technology A, this paper aligns with the journal's focus on surface science and thin films. It contributes to the understanding of step-height doubling transitions on vicinal surfaces. This study enhances the journal's standing in the field of surface physics and materials science.