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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: Jun 16, 2025

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Ferroelectrovalley in Two-Dimensional Multiferroic Lattices.

Jiangyu Zhao¹, Yangyang Feng¹, Ying Dai¹

¹School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Shandanan Street 27, Jinan 250100, China.

|August 16, 2024

Summary

This summary is machine-generated.

Researchers introduce ferroelectrovalley, a new method for valleytronics that uses ferroelectricity instead of magnetic fields to control the valley index in 2D materials.

Keywords:

ferroelectric ferroelectrovalley first-principles two-dimensional materials valley physics

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

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Published on: May 29, 2018

Area of Science:

Condensed Matter Physics
Materials Science
Quantum Phenomena

Background:

Valley index engineering is crucial for valleytronics but relies on challenging magnetic-field-driven spin-orientation reversal.
Existing methods face limitations due to the difficulty of controlling spin orientation.

Purpose of the Study:

To propose and demonstrate an alternative strategy for valley index control using ferroelectricity.
To introduce the concept of a ferroelectrovalley for advanced electronic applications.

Main Methods:

Symmetry arguments and tight-binding model analysis.
First-principles calculations.
Investigation of two-dimensional multiferroic kagome lattices.

Main Results:

Demonstrated that C2 rotation can replace time reversal for valley index manipulation.
Introduced the ferroelectrovalley concept, enabling valley index control via ferroelectricity.
Confirmed the concept in single-layer Ti3Br8, showing ferroelectricity coupling with lattice breathing.

Conclusions:

The ferroelectrovalley concept offers a novel pathway for valleytronics.
This approach overcomes limitations of magnetic-field-dependent methods.
Findings pave the way for new 2D materials and valleytronic device research.