扭曲双层石墨烯中对外部冲击的热电反应:角度选择性的激发强度值
Junwei Yang1, Yangjie Wang2, Jige Chen2,3,4
1School of Arts and Sciences, Shanghai Dianji University, Shanghai 201306, China.
Physical chemistry chemical physics : PCCP
|July 25, 2025
概括
扭曲双层石墨烯中的热和电传输在很大程度上是未知的. 我们发现,能量传输对扭曲角度不敏感,直到一个值,之后形成缺陷,增强导电性.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
背景情况:
- 热和电导率对于格子系统至关重要.
- 扭曲双层石墨烯是量子相的一个有前途的材料,但在应力下其运输特性尚未得到充分理解.
研究的目的:
- 在强烈的外部热刺激下,研究扭曲双层石墨烯的热和电传输行为.
- 阐明微观机制,以应对不同的激发强度和扭曲角度,控制能量传输.
主要方法:
- 利用大规模的ab initio不平衡分子动力学模拟.
- 分析了成千上万的原子,以研究弹性和平面模式之间的能量分布.
- 计算了原始和缺陷结构的状态密度.
主要成果:
- 扭曲双层石墨烯中的能量传输在很大程度上对低于激发值的扭曲角度不敏感.
- 在值以上,特别是在AB堆叠附近,能量转移到平面模式,导致5-7-7-5环缺陷.
- 缺陷形成显著提高了热和电传输速度,特别是电导率.
结论:
- 这项研究揭示了一个关键的激发值,控制了扭曲双层石墨烯中能量传输机制的过渡.
- 在AB堆叠附近的缺陷形成是提高导电性的关键,为材料行为提供了洞察力.
- 这些发现表明,设计可调节的热和热电器件有潜力.
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