Modeling the Anisotropy of Step Fluctuations on Surfaces: Theoretical Step Stiffness Confronts Experiment

dc.contributor.advisorEinstein, Theodore Len_US
dc.contributor.authorStasevich, Timothy Johnen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.description.abstractIn this thesis, we study the anisotropy of step stiffness: an important parameter describing the fluctuations of surface steps within the continuum step model. Using a lattice-gas framework, we derive many practical formulas for the anisotropy of step stiffness on face centered cubic {001} and {111} surfaces. We compare our formulas to experiments on Ag and Cu surfaces and thereby predict the size of nearest-neighbor, next-nearest-neighbor, and three-adatom, non-pairwise "trio" interactions between adatoms. To further corroborate our theory, we perform a series of first-principle calculations of the relevant adatom interactions. We also incorporate our formulas into simulations and model the relaxation of a Ag step initially pinned by surface impurities. Finally, we extend our theory to model Ag steps decorated by C_60 molecules. Together, our work provides a consistent picture of step stiffness anisotropy from an experimental, theoretical, and numerical perspective.en_US
dc.format.extent5076682 bytes
dc.subject.pqcontrolledPhysics, Condensed Matteren_US
dc.subject.pquncontrolledSurface Physicsen_US
dc.subject.pquncontrolledCrystal Anisotropyen_US
dc.subject.pquncontrolledStatistical Mechanicsen_US
dc.titleModeling the Anisotropy of Step Fluctuations on Surfaces: Theoretical Step Stiffness Confronts Experimenten_US


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