Related Experiment Video
Updated: Jun 2, 2025
09:25
Fabricating van der Waals Heterostructures with Precise Rotational Alignment
Published on: July 5, 2019
9.4K
Emergent superconductivity driven by Van Hove singularity in a Janus Mo2PS monolayer
Meng Tang1, Wenyuan Zhang2, Guochun Yang2
1School of Physics and Electronics, Hunan University, Changsha 410082, China. hqdeng@hnu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|January 16, 2025
Summary
We discovered a new 2D Janus Mo2PS monolayer with high stability. Tensile strain significantly boosts its superconductivity, making it promising for 2D straintronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Two-dimensional (2D) Janus structures exhibit broken mirror symmetry, leading to unique physical phenomena.
- These materials are of significant interest for advanced electronic and physical applications.
Purpose of the Study:
- To propose and investigate a novel 2D Janus Mo2PS monolayer.
- To explore its stability, electronic properties, and potential for superconductivity and straintronics.
Main Methods:
- First-principles structural search calculations were employed to identify the Mo2PS monolayer.
- Density of states calculations and phonon-mediated superconductivity analysis were performed.
Main Results:
- The Mo2PS monolayer exhibits high thermodynamic and dynamic stability.
- Mo 4d-orbitals dominate metallicity, with Van Hove singularities (VHSs) near the Fermi level.
- Phonon-mediated superconductivity was observed, with critical temperature (Tc) enhanced nearly tenfold under tensile strain due to softened acoustic modes and a new saddle point VHS.
Conclusions:
- The Janus Mo2PS monolayer is a stable 2D material with significant potential for superconductivity.
- Strain engineering can dramatically enhance its superconducting properties.
- This material shows promise for future 2D straintronic applications.
Related Concept Videos
01:28Types Of Superconductors
931
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...
931
01:24Superconductor
1.1K
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...
1.1K
01:31Ferromagnetism
2.4K
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...
2.4K
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
4.6K
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...
4.6K
02:33Phase Transitions: Sublimation and Deposition
16.7K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
16.7K