对于一个振动模式的霍尔斯坦模型,是否存在有限的移动性? 来自实时模拟的含义
Tianchu Li1,2, Yaming Yan1,2, Qiang Shi1,2
1Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100190, China.
本研究研究了荷尔斯坦模型中电荷载体的移动性. 结果表明有限的移动性不能在探索的参数空间中定义,特别是没有摩擦.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子化学 是一个量子化学.
- 材料科学 材料科学 材料科学
背景情况:
- 标准霍尔斯坦模型描述了受电子-声子相互作用影响的电荷传输.
- 在这个模型中存在有限的电荷载体移动性,特别是散射振动模式,是一个开放的问题.
研究的目的:
- 在标准霍尔斯坦模型中调查有限电荷载体流动性的存在.
- 探索振动模式散射 (摩擦) 对电荷载体移动性的影响.
主要方法:
- 在数值模拟中使用了层次运动方程 (HEOM) 方法.
- 在每个站点上,模拟模型系统具有散射振动模式.
- 计算了无摩擦霍尔斯坦模型的电流自相关函数.
主要成果:
- 随着摩擦的减少,载荷载体的移动性显著增加.
- 无法获得无摩擦的移动性极限.
- 即使在无摩擦模型中增加了位点数,也无法实现当前自相关函数的收结果.
结论:
- 对于标准霍尔斯坦模型来说,有限的电荷载体流动性不能在研究的参数模式内被定义.
- 振动模式的散射性在确定电荷传输特性方面起着至关重要的作用.
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