Relationship between two-level systems and quasilocalized normal modes in glasses

Tunnelling Two-Level Systems (TLS) dominate the physics of glasses at low temperatures. Yet TLS are extremely rare and it is difficult to directly observe them $\it{in \, silico}$. It thus crucial develop simple structural predictors that can provide markers for determining if a present in given glass region. has been speculated Quasi-Localized vibrational Modes (QLM) closely related TLS, one extract information about from QLM. In this work we address possibility. particular, investigate degree which linear or non-linear mode analysis predict location independently found by energy landscape exploration. We find even though there notable spatial correlation between QLM general strongly their global properties cannot be predicted normal analysis.