相关实验视频
Updated: Jun 24, 2025
06:50
Synthesis of Hierarchical ZnO/CdSSe Heterostructure Nanotrees
Published on: November 29, 2016
10.0K
在一个一维的Ni (II) -doped ZnTe纳米结构中的光子载体-旋转合
Arfan Bukhtiar1, Ke Bao1, Muhammad Sheraz Khan1
1School of Physical Science and Technology, Guangxi University, Nanning 530004, People's Republic of China.
Nanotechnology
|June 5, 2024
概括
在II-VI半导体中,过渡金属离子兴奋剂会产生具有强烈自旋声子相互作用的激电磁极子. 即使在室温下也能观察到这些相互作用,为在稀释磁性半导体中进行光学控制铺平了道路.
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
- 半导体物理 半导体物理
背景情况:
- 过渡金属 (TM) 离子在II-VI半导体中的合导致稀释磁性半导体 (DMS).
- 刺激磁极子 (EMP) 和局部EMP与纵向光学 (LO) 声子合是DMS的关键现象.
- 了解光学特性,包括热载体效应和极子相互作用,对于DMS应用至关重要.
研究的目的:
- 为了研究TM-doped II-VI半导体中激子磁极子 (EMP) 的形成和特性.
- 探索局部EMP,纵向光学 (LO) 声子和自旋相互作用之间的合.
- 为了证明在室温下光学控制的稀释磁性半导体应用的潜力.
主要方法:
- 在Ni-化ZnTe的温度依赖光发光谱学.
- 激电子磁极子 (EMP) 形成和光学性能的分析.
- 研究自旋-声子相互作用及其温度依赖性.
主要成果:
- 高激发功率抑制了电荷的捕获,使得可以在室温下进行EMP观测 (RT).
- 由于极子半径大和载体-MP相互作用,强大的自旋声波极子和无声效应.
- 观察自由刺激子 (FX) 与2LO声子和EMP峰值相互作用,以及离子的d-d过渡.
- 归因于旋转诱导的局部化在带隙尾部状态的RT能量转移.
结论:
- 在TM-doped II-VI半导体中,在RT时,旋转-旋转磁合和旋转-声子相互作用是显著的.
- 观察到的现象为光学控制的DMS应用开辟了新的途径.
- 局部化的EMP及其与LO声子的相互作用对RT功能至关重要.
相关概念视频
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
999
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...
999
01:08NMR Spectroscopy: Spin–Spin Coupling
1.3K
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...
1.3K