Related Experiment Video
Updated: May 7, 2025
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.0K
Superconductivity from Domain Wall Fluctuations in Sliding Ferroelectrics.
Gaurav Chaudhary1, Ivar Martin2
1TCM Group, Cavendish Laboratory, <a href="https://ror.org/013meh722">University of Cambridge</a>, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
Physical Review Letters
|January 3, 2025
Summary
Ferroelectric domain walls in 2D van der Waals bilayers attract electrons, potentially explaining superconductivity in materials like Td-MoTe2. This attraction arises from domain wall fluctuations driven by soft interlayer shear phonons.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Physics
Background:
- Two-dimensional van der Waals materials offer unique electronic properties.
- Bilayers lacking inversion symmetry exhibit ferroelectricity via interlayer polarization.
- Ferroelectric switching involves relative layer sliding and charge transfer.
Purpose of the Study:
- Investigate the nature of domain walls in ferroelectric 2D van der Waals bilayers.
- Explore the mechanism behind electron attraction at these domain walls.
- Assess the relevance of this mechanism to superconductivity in specific material systems.
Main Methods:
- Theoretical analysis of ferroelectric domain walls.
- Investigation of electron-phonon interactions.
- Phonon spectrum analysis, focusing on interlayer shear modes.
Main Results:
- Domain walls in these bilayers are sites of strong electron attraction.
- This attraction is mediated by ferroelectric domain wall fluctuations.
- Fluctuations are driven by soft interlayer shear phonons.
Conclusions:
- The identified electron attraction mechanism is relevant to sliding ferroelectricity.
- This mechanism may explain the interplay between ferroelectricity and superconductivity in bilayer Td-MoTe2.
- The mechanism could also play a role in the superconductivity of moiré bilayers.
Related Concept Videos
01:31Ferromagnetism
2.3K
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...
2.3K
01:24Superconductor
1.0K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
1.0K
01:28Types Of Superconductors
878
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
878
01:17Theory of Metallic Conduction
1.3K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.3K
01:26Electric Field at the Surface of a Conductor
4.5K
Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
4.5K
01:27Electrostatic Boundary Conditions in Dielectrics
1.0K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.0K