纳米材料的柔软表面可以产生强烈的声子相互作用
Deniz Bozyigit1, Nuri Yazdani1, Maksym Yarema1
1Laboratory for Nanoelectronics, Department of Information Technology and Electrical Engineering, ETH Zurich, CH-8092 Zurich, Switzerland.
Nature
|March 10, 2016
概括
纳米晶体半导体中的声子表现出减少的对称性和低能量,影响电子声子合. 这项研究解释并证实了设备设计中纳米材料的强合和快速能耗.
科学领域:
- 材料科学
- 凝聚物质物理学
- 纳米技术
背景情况:
- 声子对于材料中的能量转移至关重要,但对纳米材料的理解很少.
- 纳米材料越来越多地用于半导体设备,因此需要对它们的声子特性有更深入的了解.
研究的目的:
- 作为晶体大小的函数,量化自下而上制造的半导体中的音声特性.
- 阐明纳米晶体材料中的声子行为和电子声子合之间的关系.
主要方法:
- 不弹性的中子散射测量.
- 一开始的分子动力学模拟.
- 结合了声子的微观和热力学理论.
主要成果:
- 在纳米晶体半导体中,由于表面的机械柔软性,声模式显示了对称性降低和低能量.
- 在纳米晶体材料中,电子-声子合很强,使高能耗率成为可能.
- 实验证实了强大的电子声声合和快速的多声声转换率.
结论:
- 了解纳米材料的声子特性是解释电子与声子相互作用的关键.
- 这种知识有助于合理选择纳米材料和设备设计以提高性能.
相关概念视频
Van der Waals Interactions
73.1K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
73.1K
Noncovalent Attractions in Biomolecules
66.0K
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
66.0K
Noncovalent Attractions in Biomolecules
20.3K
20.3K
Intermolecular Forces and Physical Properties
29.7K
29.7K
Molecular and Ionic Solids
20.8K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.8K
Intermolecular Forces
76.8K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
76.8K


