在六角化中合自旋对的量子辐射
Song Li1,2, Anton Pershin3,4, Adam Gali5,6,7
1HUN-REN Wigner Research Centre for Physics, Budapest, Hungary. li.song@csrc.ac.cn.
Nature communications
|July 2, 2025
概括
六角化 (hBN) 中的捐赠者-接受者对解释了量子发射器特性. 这一发现有助于识别和优化用于室温量子信息处理的缺陷量子比特.
科学领域:
- 量子信息科学 量子信息科学
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
背景情况:
- 宽带间隙材料中的可光学定位的缺陷量子比特对室温量子信息处理具有前景.
- 二维 (2D) 六角化 (hBN) 提供了可扩展的量子发射器和内存准备的潜力.
- 报道的hBN缺陷量子位的微观起源和光学特性仍然不清楚.
研究的目的:
- 为了阐明hBN中的量子发射器的微观起源.
- 了解hBN缺陷量子位中光学转换和光学检测磁共振 (ODMR) 的性质.
- 为了将量子发射器属性与特定的缺陷结构联系起来.
主要方法:
- 使用ab initio计算来建模hBN中的缺陷结构.
- 研究了光学光谱,寿命和光谱稳定性之间的关系.
- 分析了在潜在缺陷量子比特系统中观察ODMR信号的条件.
主要成果:
- 在hBN中建立了量子发射器特征和捐助者-接受者对 (DAP) 之间的联系.
- 证明了DAP可以为接受器显示ODMR信号,在非零磁场下,S = 1/2基本状态.
- 确定了超细相互作用作为调解ODMR信号的主导机制,这取决于捐赠伙伴.
结论:
- 捐赠者-接受者对模型为理解hBN中的量子发射器提供了一个框架.
- 这种模型促进了量子应用中缺陷量子比特的识别和优化.
- 这些发现为提高基于hBN的量子技术的性能铺平了道路.
相关概念视频
Spin–Spin Coupling Constant: Overview
1.0K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.0K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.2K
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...
1.2K
Spin–Spin Coupling: One-Bond Coupling
1.1K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.1K
Atomic Nuclei: Nuclear Spin State Overview
1.1K
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...
1.1K
Hybridization of Atomic Orbitals I
49.2K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
49.2K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
1.1K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.1K


