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arXiv 1604.07565physics.chem-phcond-mat.stat-mechphysics.comp-ph
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稠密液体中化学势的亚稳态计算

Chemical Potential Calculations In Dense Liquids Using Metadynamics

Claudio Perego, Federico Giberti, Michele Parrinello

摘要:

化学势的计算一直是原子模拟中的一个难题。最常用的方法之一是Widom的插入法,其中化学势是通过定期尝试在系统中插入额外的粒子来计算的。在密集系统中,这种方法失败,因为插入概率非常低。在本文中,我们表明,在一个均匀的流体中的插入概率可以增加使用metadhesics。我们测试我们的方法上过冷高密度二元Lennard-Jones流体。我们发现,我们可以得到有效的收敛结果,即使Widom的方法失败。

英文摘要:

The calculation of chemical potential has traditionally been a challenge in atomistic simulations. One of the most used approaches is Widom's insertion method in which the chemical potential is calculated by periodically attempting to insert an extra particle in the system. In dense systems this method fails since the insertion probability is very low. In this paper we show that in a homogeneous fluid the insertion probability can be increased using metadynamics. We test our method on a supercooled high density binary Lennard-Jones fluid. We find that we can obtain efficiently converged results even when Widom's method fails.

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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