Soliton Staircases and Standing Strain Waves in Confined Colloidal Crystals

TL;DR

This study uses computer simulations to demonstrate how confinement in a 2D colloidal crystal induces soliton staircases and standing strain waves, offering a controllable way to influence mesoscopic structures for nanomaterial assembly.

Contribution

It reveals how confinement parameters control the formation of soliton staircases and strain waves in colloidal crystals, a novel mechanism for structure formation.

Findings

Soliton staircases form along confining boundaries.

Standing strain waves are induced throughout the crystal.

The periodicity of waves correlates with channel width D.

Abstract

We show by computer simulation of a two-dimensional crystal confined by corrugated walls that confinement can be used to impose a controllable mesoscopic superstructure of predominantly mechanical elastic character. Due to an interplay of the particle density of the system and the width D of the confining channel, "soliton staircases" can be created along both parallel confining boundaries, that give rise to standing strain waves in the entire crystal. The periodicity of these waves is of the same order as D. This mechanism should be useful for structure formation in the self-assembly of various nanoscopic materials.