相关实验视频

Updated: Jul 16, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

在h-BN/SiC异构结构中的扭曲接口处非线性光学

Abhijit Biswas¹, Rui Xu¹, Gustavo A Alvarez²

¹Department of Materials Science and Nanoengineering, Rice University, Houston, TX, 77005, USA.

Advanced materials (Deerfield Beach, Fla.)

|September 14, 2023

概括

研究人员开发了一种简单的方法,在3D基板上在2D材料中创建扭曲的接口. 这种方法可以通过扭曲角度控制材料属性,从而为纳米技术中的twistronics提供新的应用.

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
纳米技术纳米技术

背景情况:

扭曲二维材料的电子特性研究Twistronics在精确控制和单晶要求方面面临挑战.
创建扭曲接口的现有方法是复杂的,并且很难用于实际应用.

研究的目的:

引入一种简单的,可扩展的方法,以实现 2D 材料中取决于扭曲接口的属性.
探索在3D基板上培养的纳米晶体六角化 (h-BN) 薄膜中的结构性质相关性.

主要方法:

在碳化物 (4H-SiC) 基板上直接生长的纳米晶体h-BN薄膜具有高格子不匹配.
使用基于时间依赖密度函数理论的第一原则计算.

主要成果:

纳米晶 h-BN 薄膜在室温下表现出强烈的非线性二生成和超低的横平面导热率.
范德瓦尔斯堆叠的纳米晶体之间扭曲的域边缘与随机的平面内方向被确定为这些属性的原因.
计算证实了扭曲的h-BN层中强烈的偶序光学非线性.

结论:

在3D基板上直接沉积的2D纳米晶膜为工程扭曲接口提供了一条可访问的途径.
这种方法提供了一种简单且可扩展的方法,用于将2Dtwistronics集成到高级纳米技术的3D设备中.

关键词:

在 h-BN 电影中使用 h-BN 电影.纳米领域是一个纳米领域.第二个波的第二代波.导热率导热率导热率导热率导热率导热率时间依赖密度函数理论扭曲接口的接口.

更多相关视频

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

相关概念视频

Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

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...