Relationship between two-level systems and quasi-localized normal modes in glasses

D. Khomenko, D. Reichman, F. Zamponi
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引用次数: 8

Abstract

Tunnelling Two-Level Systems (TLS) dominate the physics of glasses at low temperatures. Yet TLS are extremely rare and it is extremely difficult to directly observe them $\it{in \, silico}$. It is thus crucial to develop simple structural predictors that can provide markers for determining if a TLS is present in a given glass region. It has been speculated that Quasi-Localized vibrational Modes (QLM) are closely related to TLS, and that one can extract information about TLS from QLM. In this work we address this possibility. In particular, we investigate the degree to which a linear or non-linear vibrational mode analysis can predict the location of TLS independently found by energy landscape exploration. We find that even though there is a notable spatial correlation between QLM and TLS, in general TLS are strongly non-linear and their global properties cannot be predicted by a simple normal mode analysis.
双能级系统与玻璃准定域法模的关系
隧道双能级系统(TLS)在低温下的玻璃物理学中占主导地位。然而,TLS非常罕见,并且很难直接观察到它们。因此,开发简单的结构预测器是至关重要的,它可以提供标记,以确定在给定的玻璃区域中是否存在TLS。人们推测准局域振动模式(quasi - localization vibrational Modes, QLM)与TLS密切相关,并且可以从QLM中提取有关TLS的信息。在这项工作中,我们解决了这种可能性。特别是,我们研究了线性或非线性振动模式分析在多大程度上可以预测由能量景观勘探独立发现的TLS的位置。我们发现,尽管QLM和TLS之间存在显著的空间相关性,但总体上TLS是强非线性的,它们的整体性质不能通过简单的正态分析来预测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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