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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Two-dimensional surface melting with an intermediate quasi-hexatic layer.

Wei Li^1,2, Tianran Zhang², Zhisheng Wang²

¹Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China.

Nature Communications

|June 23, 2026

Summary

This summary is machine-generated.

Melting in two-dimensional (2D) systems with free surfaces occurs through a double wetting process, driven by surface-emitted dislocations, not bulk nucleation as previously theorized.

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Area of Science:

Condensed matter physics
Materials science
Colloidal systems

Background:

Melting in two-dimensional (2D) systems presents unique physics compared to three dimensions.
The Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) theory describes 2D melting via two bulk transitions and an intermediate hexatic phase.
The KTHNY theory does not fully incorporate the effects of free surfaces on 2D melting.

Purpose of the Study:

To investigate the mechanism of melting in 2D systems with free surfaces.
To elucidate the role of free surfaces in initiating and driving the melting process.
To compare surface-initiated melting with the prevailing bulk-initiated KTHNY theory.

Main Methods:

Utilized single-particle imaging of optically-driven 2D colloidal solids.
Observed and analyzed the formation and growth of wetting layers during melting.
Quantified dislocation emission from free surfaces and their propagation into the solid.

Main Results:

Melting with free surfaces follows a double wetting pathway, forming distinct quasi-hexatic and quasi-liquid layers.
Wetting layer thicknesses exhibit power-law divergence prior to melting.
Free surfaces act as continuous sources of dislocations, driving layer invasion and distinct solid-hexatic and hexatic-liquid transitions.

Conclusions:

The study reveals a surface-initiated pathway for 2D melting, distinct from the KTHNY bulk mechanism.
Free surfaces fundamentally alter 2D melting dynamics by emitting dislocations.
Findings provide new insights into colloidal matter, 2D materials, and fundamental condensed matter physics.