论文标题
两级系统与玻璃中准定位的正常模式之间的关系
Relationship between two-level systems and quasi-localized normal modes in glasses
论文作者
论文摘要
在低温下，隧道两级系统（TLS）主导着眼镜的物理。然而，TLS极为罕见，很难直接观察它们$ \ it {in \，Silico} $。因此，开发简单的结构预测因子至关重要，该预测能够提供标记以确定在给定玻璃区域中是否存在TLS。据推测，准定位的振动模式（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可以预测通过能量景观探索独立发现的TL的位置的程度。我们发现，即使QLM和TLS之间存在显着的空间相关性，但总的来说，TLS是强烈的非线性，并且无法通过简单的正常模式分析来预测它们的全局性质。
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.
