在短波红外波长下大非互惠光学吸收的非挥发性切换
Kenta Kimura1, Tsuyoshi Kimura2
1Department of Materials Science, Osaka Metropolitan University, Osaka 599-8531, Japan.
Physical review letters
|February 2, 2024
概括
我们在LiNiPO4中观察到显著的非互惠的光学吸收,LiNiPO4是一种磁电反铁磁体,在短波红外波长中. 这种高达40%的效应可以通过磁场进行切换,并且与离子过渡有关.
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
- 光学是什么?光学是什么?光学是什么?
背景情况:
- 磁电 (ME) 反铁磁体 (AFM) 为先进的电子设备提供独特的特性.
- 非互惠的光学吸收,在相反方向传播的光的吸收不同时,对于光学切换应用至关重要.
研究的目的:
- 为了研究磁电反铁磁体LiNiPO4在短波红外 (SWIR) 波长中的非互惠的光学吸收.
- 了解对观察到的非互惠性负责的潜在物理机制.
- 探索用于实际应用的增强这种非互惠的途径.
主要方法:
- 在SWIR波长下对LiNiPO4中的光学吸收光谱进行实验测量.
- 应用外部磁场来观察切换行为.
- 对称性分析以阐明非互惠吸收的起源.
主要成果:
- 在LiNiPO4.4中观察到很大的非互惠的光学吸收,在1450nm时高达~40%,在LiNiPO4.
- 发现非互惠性可以通过外部磁场以非挥发的方式切换.
- 这种现象归因于由旋转轨道合影响的Ni2+d-d过渡.
结论:
- 在SWIR范围内,LiNiPO4表现出显著的,可磁切换的非互换光学吸收.
- 这些发现突出了自旋轨道合在Ni2+d-d转换中对这种效应的作用.
- 这项研究提出了一个设计,以加强未来ME AFM中对单向光透明度的非互惠性.
相关概念视频
IR Absorption Frequency: Hybridization
687
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
687
IR Absorption Frequency: Delocalization
799
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
In IR...
799
UV–Vis Spectroscopy: Molecular Electronic Transitions
1.5K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.5K
Infrared (IR) Spectroscopy: Overview
1.8K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Different compounds display unique properties due to their...
1.8K
Molecular Spectroscopy: Absorption and Emission
2.3K
Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
2.3K
IR Spectroscopy: Molecular Vibration Overview
2.3K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
2.3K


