在Janus SnXY/WXY (X,Y = S,Se,Te;X ≠ Y) 异构结构中的Rashba旋转分裂
1Department of Physics, Indian Institute of Science Education and Research, Pune 411008, India.
概括
詹纳斯锡二基异构体表现出显著的Rashba旋转分裂 (RSS),这是旋转电子学的一个关键特性. 压缩应变增强了RSS,使这些材料成为未来电子设备的有希望的材料.
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
- 这就是Spintronics.
背景情况:
- 雅努斯过渡金属二甲基化物单层缺乏外平面镜面对称性.
- 这种不对称性,结合旋转轨道合,诱导拉什巴旋转分裂 (RSS).
- 由于它对电子自旋的控制,RSS对于自旋电子应用至关重要.
研究的目的:
- 在Janus锡二甲基化物单层中调查RSS.
- 在Janus SnXY/WXY异构结构 (HSs) 中分析RSS.
- 检查垂直应变对这些HS的RSS的影响.
主要方法:
- 使用了第一原则计算.
- 密度函数理论 (DFT) 用于建模电子属性.
- 计算了带结构和旋转分裂能量.
主要成果:
- 在Janus SnSSe/WSSe HS中观察到显著的RSS,超过室温能量.
- 发现垂直应变调节RSS:压缩应变增强,拉伸应变减少它.
- 在10.4%的压力压力下,Janus SnSSe/WSSe HS保持了其半导体性质,并增强了Rashba参数 (0.96 eV Å) 和分裂能量 (72 meV).
结论:
- 斯SnSSe/WSSe异构结构是旋转子器件的有希望的材料.
- 应变工程提供了一种可行的方法来调整和增强自旋分裂性质.
- 观察到的显著RSS突出了这些材料在先进电子应用中的潜力.
更多相关视频
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.1K
05:39Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
9.7K
相关概念视频
01:13¹H NMR Signal Multiplicity: Splitting Patterns
5.2K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
5.2K
01:13¹H NMR: Complex Splitting
1.3K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.3K
01:10Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
1.4K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1 triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.4K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.1K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.1K
01:08NMR Spectroscopy: Spin–Spin Coupling
1.5K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.5K
01:03Atomic Nuclei: Nuclear Spin State Overview
1.0K
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...
1.0K