在MnC4中的二维反铁磁节点线半金属和旋转霍尔效应
H Fernandez1, R Gonzalez-Hernandez2, J Paez3
1CICFIM Facultad de Ciencias Físico Matemáticas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Nuevo León, Código Postal 66450, México.
概括
研究人员在抗铁磁MnC4中发现了一个强大的迪拉克节点线,这是一个拓材料. 这个节点线被对称性所保护,并显示出用于自旋电子设备的潜力.
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:
- 节点线半金属是一种独特的拓材料类,在1D k空间线上具有迪拉克式交叉.
- 反铁磁材料由于它们的磁性排序,为自旋电子提供了潜在的潜力.
- 旋转轨道合 (SOC) 显著影响电子带结构和材料特性.
研究的目的:
- 为了研究室温抗铁磁MnC4.4的拓性质.
- 分析MnC4带有和没有自旋轨道合 (SOC) 的节点线特征.
- 探索MnC4在旋转器件中的潜在应用.
主要方法:
- 电子频段结构的理论研究.
- 对称性保护机制对节点线的分析.
- 模拟材料对诸如应变和扭曲等扰动的反应.
- 计算自旋霍尔导电率.
主要成果:
- 缺少SOC:通过时间逆转,镜像和部分翻译对称性保护的双重退化的迪拉克节点线被确定.
- 坚固性:节点线保持稳定,能够抵御因离子结合而产生的同otropic/ anisotropic 应变和扭曲变形.
- SOC的存在:从反铁磁和SOC诱导的旋转旋转对称性破坏的相互作用中出现了一条准迪拉克节点线.
- 旋转厅导电性:在准节点线的能量范围内观察到强大的旋转厅导电性.
结论:
- MnC4表现出一个强大的对称性保护的迪拉克节点线反铁磁单层.
- 这种材料在应力和扭力下的稳定性使其成为螺旋电子应用的有希望的候选者.
- 反铁磁和SOC之间的相互作用导致独特的拓特征和自旋传输特性.
相关概念视频
03:02Colors and Magnetism
11.7K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.7K
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
01:26Diamagnetism
2.4K
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....
2.4K
01:30The Hall Effect
2.4K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
2.4K
01:03Atomic Nuclei: Nuclear Spin State Overview
958
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
958
02:42Valence Bond Theory
8.6K
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...
8.6K