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相关概念视频

Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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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...
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VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

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Effect of Lone Pairs of Electrons on Molecule Geometry
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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
9.0K
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

8.1K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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相关实验视频

Updated: Jun 28, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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单层六角化物光波控制的哈尔丹模型

Sambit Mitra1,2, Álvaro Jiménez-Galán3,4, Mario Aulich2,5

  • 1Max Planck Institute of Quantum Optics, Garching, Germany.

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|April 15, 2024
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概括

研究人员展示了原子薄材料中电子传输的光学控制. 量身定制的光波形模仿扭曲层叠加, 实现量子性质的超快切换, 并创建新的电子设备.

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科学领域:

  • 凝聚物质物理学
  • 量子光学
  • 材料科学

背景情况:

  • 具有匹配晶体对称性的原子薄材料使得具有新兴性质的超级晶格结构.
  • 控制光场可以在超快的时间尺度上操纵电子传输.

研究的目的:

  • 展示一个光波驱动的模拟扭曲层堆叠.
  • 实现对时间逆向对称性破坏的光学控制,并在激光处理的二维晶体中实现拓哈尔丹模型.

主要方法:

  • 调整光波形的空间对称性以与六边形化晶格对称性相匹配.
  • 扭曲光波形来诱导对称性破坏的光学控制.
  • 使用光学波测量来检测山谷霍尔电流.

主要成果:

  • 在激光处理的2D绝缘晶体中实现拓哈尔丹模型.
  • 通过旋转光波形来超快速切换带结构配置.
  • 由于量子谷之间的不对称群体,产生可测量的霍尔流.

结论:

  • 开发的方案提供了对谷选择性带隙工程的强大的光学控制.
  • 这种方法可以创建使用量子自由度的几秒钟开关.
  • 这些发现为超快的电子设备和量子信息处理开辟了新的途径.