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arXiv 2103.16522cond-mat.soft
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多组分广义模式耦合理论:从结构预测玻璃态混合物的动力学

Multi-component generalized mode-coupling theory: Predicting dynamics from structure in glassy mixtures

Simone Ciarella, Chengjie Luo, Vincent E. Debets, Liesbeth M. C. Janssen

摘要:

在致密的无序系统中,玻璃态动力学和玻璃态转变的出现在理论上仍然没有完全理解。模式耦合理论(MCT)已被证明是有效的,在描述一些非平凡的玻璃形成的功能,但它不能解释完整的玻璃现象,由于它是基于强近似。广义模耦合理论(GMCT)是模耦合理论的一个层次性扩展,它通过在广义框架下细致地描述高阶关联的动力学过程,比模耦合理论更胜一筹。不幸的是,该理论迄今为止仅针对单组分体系开发,因此对于高度多分散的材料效果不佳。在本文中,我们解决了这个问题,通过开发GMCT多组分系统。我们用它来预测的二元Kob-Andersen Lennard-Jones混合物的玻璃态动力学,以及其纯粹的排斥Weeks-Chandler-Andersen模拟。我们的研究结果表明,GMCT层次结构的每一个额外的级别逐渐提高GMCT的预测能力超过其以前的限制。这意味着我们的理论能够从静态关联中获得更多的信息,从而能够从第一性原理的角度更好地理解吸引力在过冷液体中的作用。

英文摘要:

The emergence of glassy dynamics and the glass transition in dense disordered systems is still not fully understood theoretically. Mode-coupling theory (MCT) has shown to be effective in describing some of the non-trivial features of glass formation, but it cannot explain the full glassy phenomenology due to the strong approximations on which it is based. Generalized mode-coupling theory (GMCT) is a hierarchical extension of the theory, which is able to outclass MCT by carefully describing the dynamics of higher order correlations in its generalized framework. Unfortunately, the theory has so far only been developed for single component systems and as a result works poorly for highly polydisperse materials. In this paper, we solve this problem by developing GMCT for multi-component systems. We use it to predict the glassy dynamics of the binary Kob-Andersen Lennard-Jones mixture, as well as its purely repulsive Weeks-Chandler-Andersen analogue. Our results show that each additional level of the GMCT hierarchy gradually improves the predictive power of GMCT beyond its previous limit. This implies that our theory is able to harvest more information from the static correlations, thus being able to better understand the role of attraction in supercooled liquids from a first-principles perspective.

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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