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arXiv 2102.00289physics.chem-phphysics.comp-ph
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使用自适应量子热浴以近经典计算成本研究液态水中的核量子效应

Nuclear Quantum Effects in liquid water at near classical computational cost using the adaptive Quantum Thermal Bath

Nastasia Mauger, Thomas Plé, Louis Lagardère, Sara Bonella, Etienne Mangaud, Jean-Philip Piquemal, Simon Huppert

摘要:

我们证明了最近推出的方法来考虑核量子效应(NQE)的分子模拟的准确性和效率:自适应量子热浴(adQTB)。在这种方法中,零点能量是通过一个广义朗之万恒温器,旨在精确地执行量子涨落耗散定理。我们提出了一个改进的adQTB算法,提高了精度,我们报告的液态水的adQTB模拟。通过与参考路径积分计算的广泛比较,我们证明,它提供了很好的精度为广泛的结构和热力学观测以及红外振动光谱。adQTB具有与经典分子动力学相当的计算成本,能够模拟高达数百万个自由度。

英文摘要:

We demonstrate the accuracy and efficiency of a recently introduced approach to account for nuclear quantum effects (NQE) in molecular simulations: the adaptive Quantum Thermal Bath (adQTB). In this method, zero point energy is introduced through a generalized Langevin thermostat designed to precisely enforce the quantum fluctuation-dissipation theorem. We propose a refined adQTB algorithm with improved accuracy and we report adQTB simulations of liquid water. Through extensive comparison with reference path integral calculations, we demonstrate that it provides excellent accuracy for a broad range of structural and thermodynamic observables as well as infrared vibrational spectra. The adQTB has a computational cost comparable to classical molecular dynamics, enabling simulations of up to millions of degrees of freedom.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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