矩阵产品状态和多配置时间依赖的 Hartree 方法对激励子解离的非adiabatic 动态进行比较
Maximilian F X Dorfner1, Dominik Brey2, Irene Burghardt2
1TUM School of Natural Sciences, Technische Universität München, 85748 Garching bei München, Germany.
通过比较激发状态动态的量子模拟方法,本研究发现多配置时间依赖的哈特树 (MCTDH) 和矩阵产物状态 (MPS) 方法对更简单的系统有很好的一致性,但由于纠处理,对复杂的电子振动合模型有所不同.
科学领域:
- 量子动力学就是量子动力学.
- 计算化学是一种计算化学.
- 材料科学 是一种材料科学.
背景情况:
- 有机系统中的兴奋状态动态涉及复杂的电子振动合.
- 多配置时间依赖的哈特树 (MCTDH) 方法是模拟这些动态的标准.
- 矩阵产品状态 (MPS) 方法为此类模拟提供了最近的替代方案.
研究的目的:
- 为了数值地比较MCTDH和MPS方法的精度,用于激发状态动态.
- 研究这些方法在电子振动合系统中的行为,特别是在P3HT:PCBM异质连接处.
主要方法:
- 激发状态动态的数值模拟.
- 应用多重配置时间依赖的哈特树 (MCTDH) 和矩阵产品状态 (MPS) 方法.
- 在P3HT:PCBM异质连接处模拟激子解离,具有不同数量的电子状态和振动模式.
主要成果:
- 两种MCTDH和MPS方法都显示出一个具有两个电子状态和100个振动模式的模型的优秀一致性.
- 对于具有26个电子状态和113个振动模式的更复杂模型,观察到MCTDH和MPS之间的明显偏差.
- 这种差异归因于两种计算方法对纠的不同处理.
结论:
- 选择量子模拟方法 (MCTDH与MPS) 可以影响激发状态动态的准确性,特别是对于具有显著电子振动合和高维度的系统.
- 了解纠处理对于选择复杂分子系统的适当方法至关重要.
- 对于高度纠的量子系统,可能需要对MPS方法进行进一步的研究.
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