Imaging the structure of the domain wall between symmetries interconnected by a discontinuous transition

TL;DR

This study visualizes the interface between two distinct structural symmetries in a vortex solid, revealing how one symmetry transitions into another through engineered 2D potentials and advanced imaging techniques.

Contribution

It demonstrates the first direct imaging of the domain wall between symmetries that cannot be connected by a continuous transition using single particle resolution.

Findings

Visualized the transition from square to hexagonal symmetry in vortex structures.

Observed the transformation of induced structures along the vortex direction.

Provided insights into symmetry interconnections in vortex matter.

Abstract

We have been able to observe with single particle resolution the interface between two structural symmetries that cannot be interconnected by a continuous transition. By means of an engineered 2D potential that pins the extremity of vortex strings an square symmetry was imposed at the surface of a 3D vortex solid. Using the Bitter decoration technique and on account of the continuous vortex symmetry we visualize how the induced structure transforms along the vortex direction before changing into the expected hexagonal structure at a finite distance from the surface.