Highly ordered square arrays of nanoscale pyramids produced by ion bombardment of a crystalline binary material.
basic_science · Level V
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- Record sourced from PubMed, PMID 27078344.
- Also identified by DOI 10.1103/PhysRevE.93.032207.
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Abstract
A theory is developed for the nanoscale patterns formed when the (001) surface of a crystalline binary material with fourfold rotational symmetry is subjected to normal-incidence ion bombardment. The deterministic nonlinear continuum equations account for the Ehrlich-Schwoebel barrier, which produces uphill atomic currents on the crystal surface. We demonstrate that highly ordered square arrays of nanopyramids can form in a certain region of parameter space. An Ehrlich-Schwoebel barrier is required for patterns of this kind to develop. For another range of parameters, a disordered square array of nanodots forms and the pattern coarsens over time.