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相关概念视频

Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
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Energy Bands in Solids01:01

Energy Bands in Solids

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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
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Lateralization01:28

Lateralization

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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Design Example: Alignment of a Road Line Using GIS01:17

Design Example: Alignment of a Road Line Using GIS

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The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
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Dimensional Analysis03:40

Dimensional Analysis

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Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this approach is: the units of quantities must be subjected to the same mathematical operations as their associated numbers. This method can be applied to computations ranging from simple unit conversions to more complex and multi-step calculations involving several different quantities and their units.
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相关实验视频

Updated: Feb 6, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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两维横向异构结构中的带对齐工程

Biyuan Zheng1, Chao Ma1, Dong Li1

  • 1Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, School of Physics and Electronic Science, and College of Materials Science and Engineering , Hunan University , Changsha , Hunan 410082 , China.

Journal of the American Chemical Society
|August 25, 2018
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新方法,使用二硫化 (WS2) 和二硫化 (WS2Se2) 创建可调节的二维异构. 这一突破使得先进的设备能够精确控制电子和光电子特性.

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科学领域:

  • 材料科学
  • 凝聚物质物理学
  • 纳米技术

背景情况:

  • 由于它们的接口,二维 (2D) 异构结构具有独特的特性,在电子和光电子领域具有潜在的应用.
  • 这些异构结构的带对齐工程对于优化其电子和光电子性能至关重要.

研究的目的:

  • 开发一种以连续调节带对齐的二维横向异构成的方法.
  • 研究这些新型异构结构中的组合,带间隙和带对齐调性.

主要方法:

  • 一步化学蒸汽沉积 (CVD) 用于合成WS2-WS2(1−x) Se2x单层横向异构结构.
  • 局部光发 (PL) 和拉曼光谱分析组合和频段间隙.
  • 凯尔文探针力显微镜 (KPFM) 来确认可调节带的对齐.

主要成果:

  • 在合成的横向异构结构中实现了原子利的接口.
  • 用PL和拉曼测量证实了取决于位置的组成和带间隙变化.
  • 随着x从1到0变化,KPFM显示了连续调节的频段对齐,费米水平差异下降.

结论:

  • 该研究成功地展示了一步式CVD方法,用于创建高质量的2D横向异构结构,可控制带对齐.
  • 这些发现代表了将二维半导体集成到下一代电子和光电子设备中的重大进步.