arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1907.10232cond-mat.dis-nncond-mat.mtrl-scicond-mat.stat-mech
收藏

Basis Glass指出:从Potential Energy前景中获得的新见解

Basis Glass States: New Insights from the Potential Energy Landscape

Prabhat K. Gupta, Walter Kob

摘要:

使用势能景观形式主义,我们表明,在温度范围内的玻璃形成系统的动态是热激活的,存在一组独特的“基础玻璃状态”,其中每个被限制到一个单一的metabasin的能量景观的玻璃形成系统。这些基本玻璃态覆盖了系统的整个构型空间,仅表现出二次弛豫,并且是固体状的。系统的任何宏观状态(无论是液体还是玻璃)都可以表示为基础玻璃状态的叠加,并且可以通过这些状态的概率分布来描述。在液体从高温冷却期间,概率分布在足够低的温度下冻结,描述液体到玻璃化转变的过程。在随后的老化过程中,概率分布向平衡分布的时间演变描述了玻璃的主要弛豫。

英文摘要:

Using the potential energy landscape formalism we show that, in the temperature range in which the dynamics of a glass forming system is thermally activated, there exists a unique set of "basis glass states" each of which is confined to a single metabasin of the energy landscape of a glass forming system. These basis glass states tile the entire configuration space of the system, exhibit only secondary relaxation and are solid-like. Any macroscopic state of the system (whether liquid or glass) can be represented as a superposition of basis glass states and can be described by a probability distribution over these states. During cooling of a liquid from a high temperature, the probability distribution freezes at sufficiently low temperatures describing the process of liquid to glass transition. The time evolution of the probability distribution towards the equilibrium distribution during subsequent aging describes the primary relaxation of a glass.

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。

↑