Kinetic Monte Carlo simulations of self organized nanostructures on Ta Surface Fabricated by Low Energy Ion Sputtering

TL;DR

This study uses kinetic Monte Carlo simulations to explore how low energy ion sputtering induces self-organized nanostructures on Tantalum surfaces, highlighting the importance of nonlinear effects and identifying a new universality class.

Contribution

The paper introduces a nonlinear Hamiltonian with a positive Schwoebel barrier in Kinetic Monte Carlo simulations to better describe ion-sputtered Tantalum surfaces and suggests a different universality class from KPZ.

Findings

Positive Schwoebel barrier is essential for accurate modeling.

Surface scaling exponents indicate a new universality class.

Nonlinear relaxation influences nanostructure formation.

Abstract

Surfaces bombarded with low energy ion beams often display development of self assembled patterns and quasi-periodic structures. Kinetic Monte Carlo simulations have been performed to describe ion sputtered Tantalum surfaces. A weak nonlinearity in the relaxation process has been introduced and the results show that the Positive Schwoebel barrier, produced by the nonlinear Hamiltonian, is necessary in describing ion bombarded Tantalum surfaces. Furthermore, their scaling exponents suggest presence of a class other than KPZ.