在Janus MnPSX单层中出现的变磁和拓反应
J Guerrero-Sanchez1, R Ponce-Perez1, D M Hoat2,3
1Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Apartado Postal 14, Ensenada, Baja California, 22800, Mexico.
Scientific reports
|March 11, 2026
概括
研究人员通过用其他元素代替硫,在Janus MnPS3单层中设计了g型变磁. 这种修改打破了对称性,诱导了旋转分裂,并为旋转电子学创造了拓阶段.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 量子化学 是一个量子化学.
背景情况:
- 变磁是一种新的磁性状态,其特点是时间逆向对称性被打破,但空间逆向对称性被保留.
- 纳斯单层,与他们的破碎的外平面反向对称性,提供了一个独特的平台来探索异国情调的电子和磁现象.
研究的目的:
- 为了研究在Janus MnPS3单层中工程g型变磁的可行性.
- 探索基替代对这些二维材料磁性和拓性质的影响.
主要方法:
- 综合的第一原则计算研究.
- 密度函数理论 (DFT) 计算分析电子带结构和旋转动量锁定.
- 在基替代 (O,Se,Te) 下研究结构性,电子性和磁性特性.
主要成果:
- 在Janus MnPS3单层中,素替代 (O,Se,Te) 破坏了反向对称,并诱导了电荷密度不对称.
- 这种不对称性提升了克莱默的退化,导致了变磁材料特征的动量依赖自旋分裂.
- 氧的替代导致了最大的自旋分裂,这是由于强大的Mn-O和P-O键,由高电子负性和小原子大小驱动的.
- 观察到一个具有非微不足道量子自旋霍尔顺序的拓相的出现.
结论:
- 基替代是一种有效的策略,用于在Janus MnPS3单层中定制g型变磁.
- 电子阴性和原子半径的相互作用决定了自旋分裂的大小.
- 工程变磁性和拓性质为二维分层磁体系统中的自旋和量子拓应用铺平了道路.
更多相关视频
09:54Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
Published on: July 14, 2021
5.3K
06:49Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
Published on: April 12, 2019
8.2K
相关概念视频
Potential Due to a Magnetized Object
847
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
The vector...
847
Ferromagnetism
3.3K
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...
3.3K
Diamagnetism
3.2K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
3.2K
Paramagnetism
3.1K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
3.1K
Atomic Nuclei: Magnetic Resonance
1.3K
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
1.3K
Valence Bond Theory
11.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.5K
