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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Related Experiment Video

Updated: Jul 2, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

Layer-coupled corner states in two-dimensional topological multiferroics.

Runhan Li¹, Xiaorong Zou¹, Yingxi Bai¹

¹School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China. daiy60@sdu.edu.cn.

Materials Horizons

|February 29, 2024

Summary

This summary is machine-generated.

We discovered that ferroelectric materials can control topological states in 2D materials. This ferroelectricity offers a way to manipulate layer-polarized corner states in topological insulators.

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Published on: August 15, 2018

Area of Science:

Condensed Matter Physics
Materials Science
Quantum Phenomena

Background:

Two-dimensional (2D) materials offer unique platforms for studying topological phenomena.
The layer degree of freedom is an underexplored aspect of material manipulation for topological states.

Purpose of the Study:

To investigate the coupling between second-order topological corner states and the layer degree of freedom.
To identify 2D materials exhibiting both topological properties and ferroelectricity.

Main Methods:

First-principles calculations
Tight-binding model analysis
Examination of edge states, topological indices, and spectra of nanoflakes.

Main Results:

Identified ferromagnetic H'-Co2XF2 (X = C, N) as 2D second-order topological insulators with intrinsic ferroelectricity.
Demonstrated a novel mechanism coupling topological corner states with the layer degree of freedom.
Showcased ferroelectricity as a nonvolatile method to control layer-polarized corner states.

Conclusions:

Ferroelectricity can be leveraged to manipulate topological states in 2D materials.
Established a link between ferroelectricity and nontrivial topology.
Opened new avenues for controlling second-order topological states.