通过石墨烯多层传输的非道电子传输的负过渡时间
E E Krasovskii1,2,3, R O Kuzian2,4
1Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, 20080 Donostia/San Sebastián, Basque Country, Spain.
Physical review letters
|April 11, 2025
概括
电子波包通过薄膜的传输时间显示了厚度依赖的行为. 在石墨烯和其他材料中,由于在平面上的散射,观察到新的负过渡时间.
科学领域:
- 量子力学就是量子力学.
- 凝聚物质物理学 凝聚物质物理学
- 材料科学是一种材料科学.
背景情况:
- 了解原子薄材料中的电子动态对于下一代电子来说至关重要.
- 通过晶体薄膜传输电子是由复杂的量子力学相互作用控制的.
研究的目的:
- 通过原子薄晶体薄膜研究电子传输的阿托秒动态.
- 分析电子波包传播的时间特征.
- 探索新的量子现象,如负过渡时间和维格纳时间延迟.
主要方法:
- 使用ab initio散射理论来建模电子传播.
- 分析带结构和波包传输时间之间的关系.
- 研究散射共振及其对电子动态的影响.
主要成果:
- 电子过渡时间在禁止间隙中和,在允许带中随着薄膜厚度的增加而振荡.
- 在石墨烯,h-BN和氧单层中发现了迄今为止未知的负电子传递时间,这是由于平面内散射而引起的.
- 维格纳时间延迟在散射共振时分离,这与二次衍射束的出现有关.
结论:
- 该研究提供了关于操纵电子波包传播时间的见解,而不会影响传输强度.
- 波束的共振诱导的空间重塑为阐明表面相互作用提供了潜力.
- 这些发现促进了对低维材料中量子电子传输的基本理解.
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