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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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从WS2/ReSe2异构结构中增强的第二和生成.

Kanchan Shaikh1, Taejun Yoo1, Zeyuan Zhu1

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.

The Journal of chemical physics
|March 9, 2026
PubMed
概括
此摘要是机器生成的。

范德瓦尔斯的异构结构使可调节的非线性光学成为可能. 堆叠WS2/ReSe2层显示了由于层间杂交而产生的异型第二和生成 (SHG) 增强,而不仅仅是带对齐.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 非线性光学是非线性光学.

背景情况:

  • 范德瓦尔斯 (vdW) 堆叠提供可调节的非线性光学特性.
  • 在vdW异构结构中层间相互作用对非线性光学敏感性的精确作用尚未完全理解.

研究的目的:

  • 研究具有明显晶相的WS2/ReSe2异构体中第二子生成 (SHG) 的异构增强.
  • 确定层间相互作用和带对齐对SHG响应的影响.

主要方法:

  • 制造WS2/ReSe2异质活塞.
  • 极化解决的第二和生成 (SHG) 测量.
  • 分析扭转角依赖和光谱变化.

主要成果:

  • 观察到SHG的异型增强,不仅仅由带对齐来解释.
  • 带重规范化和层间杂交的证据来自光谱转移.
  • 某些方向的SHG抑制表明了强度借贷机制.

结论:

  • 层间杂交显著改变了vdW异构结构中的SHG异构性.
  • 范德瓦尔斯对不同晶体相的堆叠允许调整非线性光学强度和偏振依赖.