# Restoring Symmetry and Enhancing Exchange via Chiral Molecular-Magnetic Hexagons

## TL;DR

Scientists restored symmetry in magnetic molecular lattices, which enhanced their magnetic interactions and simplified their behavior for potential device applications.

## Contribution

A novel method to restore symmetry in molecular magnets using interpenetrating triangular structures is introduced.

## Key findings

- Symmetry restoration in molecular-magnetic lattices strengthens exchange coupling through dipolar electrostatic interactions.
- Interpenetrating equilateral triangular structures preserve 3-fold rotational and inversion symmetry.
- The new structure is more robust and suitable for device applications.

## Abstract

Modified behaviors of molecules, designed for device
or energy
applications, can occur due to lattice-molecule incompatibilities
in point-group symmetries (PGS), long-range interactions between neighboring
molecules, or lattice-molecule charge transfer. Such sensitivities
are a prerequisite for the use of quantum molecules as devices, but
removing certain broken symmetries is desirable from the standpoint
of simplifying their behaviors. Here, we demonstrate symmetry restoration
to molecular-magnetic lattices and show that it leads to strengthened
exchange coupling due to dipolar electrostatic interactions between
neighboring molecules and due to manifestations of an earlier identification
of a spin-sensitive slightly mobile electron by et al. [

HooshmandZ.,

Phys. Rev. B
2021, 104, 134411]. Starting with a broken symmetry molecular
magnet of current interest, we demonstrate a more robust structure
composed of six molecular magnets on an h-BN-like
surface. The broken point-group symmetry is healed by constructing
interpenetrating equilateral triangular structures that are appropriately
ratcheted to preserve 3-fold rotational symmetry and inversion symmetry.