非絕熱分子動力學的量子路徑模擬
發(fā)布時間:2019-04-19 03:20
【摘要】:基于近期發(fā)展的經(jīng)典-量子混合模擬非絕熱分子動力學的量子路徑方案,本文對5個典型勢能面模型進行了模擬,包括單交叉模型、雙交叉模型、拓展耦合模型、啞鈴模型以及雙弓模型.由于難以在嚴格意義上得到退相干速率,數(shù)值模擬中,我們比較了三個不同的退相干速率公式,包括凍結高斯波包近似退相干速率、能量分辨速率以及力分辨速率.在模擬過程中,我們恰當?shù)靥幚砹藙菽苊嫣S時的能量守恒和力的反向問題.通過與全量子動力學模擬的精確結果進行對比發(fā)現(xiàn),對于結構較簡單的勢能面模型,三種退相干速率都能得到較好的結果;然而對于較復雜的勢能面模型,由于復雜量子干涉的原因,與其他混合經(jīng)典-量子動力學方案類似,量子路徑方案仍然難以得到較準確的結果.如何發(fā)展更加有效的混合經(jīng)典-量子模擬方案,是未來研究的重要課題.
[Abstract]:Based on the quantum path scheme of classical-quantum hybrid simulation for non-adiabatic molecular dynamics, five typical potential energy surface models, including single-crossover model, double-crossover model, extended coupling model, are simulated in this paper. Dumbbell model and double bow model. Because it is difficult to get the decoherence rate strictly, we compare three different decoherence rate formulas in numerical simulation, including the approximate decoherence rate of frozen Gaussian wave packet, the energy resolution rate and the force resolution rate. In the simulation process, we properly deal with the conservation of energy and the reverse of force when the potential energy surface jumps. Through the comparison with the exact results of the full quantum dynamics simulation, it is found that the three decoherence rates can obtain better results for the potential energy surface model with simple structure. However, for the more complex potential energy surface model, because of the complex quantum interference, similar to other hybrid classical-quantum dynamics schemes, the quantum path scheme is still difficult to obtain more accurate results. How to develop a more effective hybrid classical-quantum simulation scheme is an important research topic in the future.
【作者單位】: 天津大學物理系;
【分類號】:O561
本文編號:2460556
[Abstract]:Based on the quantum path scheme of classical-quantum hybrid simulation for non-adiabatic molecular dynamics, five typical potential energy surface models, including single-crossover model, double-crossover model, extended coupling model, are simulated in this paper. Dumbbell model and double bow model. Because it is difficult to get the decoherence rate strictly, we compare three different decoherence rate formulas in numerical simulation, including the approximate decoherence rate of frozen Gaussian wave packet, the energy resolution rate and the force resolution rate. In the simulation process, we properly deal with the conservation of energy and the reverse of force when the potential energy surface jumps. Through the comparison with the exact results of the full quantum dynamics simulation, it is found that the three decoherence rates can obtain better results for the potential energy surface model with simple structure. However, for the more complex potential energy surface model, because of the complex quantum interference, similar to other hybrid classical-quantum dynamics schemes, the quantum path scheme is still difficult to obtain more accurate results. How to develop a more effective hybrid classical-quantum simulation scheme is an important research topic in the future.
【作者單位】: 天津大學物理系;
【分類號】:O561
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