非絕熱分子動(dòng)力學(xué)的量子路徑模擬
[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(xué)物理系;
【分類號(hào)】:O561
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