Can I read Underlying topological Dirac nodal line mechanism of anomalously large electron-phonon coupling strength on Be (0001) surface on EtoBox?

Underlying topological Dirac nodal line mechanism of anomalously large electron-phonon coupling strength on Be (0001) surface by Li, Ronghan; Li, Jiangxu; Wang, Lei; Ma, Hui; Li, Dianzhong; Li, Yiyi; Chen, Xing-Qiu is a scholarly article available to read on EtoBox.

What is Underlying topological Dirac nodal line mechanism of anomalously large electron-phonon coupling strength on Be (0001) surface about?

Beryllium was recently discovered to harbor a Dirac nodal line (DNL) in its bulk phase and the DNL-induced non-trivial drumhead-like surface states (DNSSs) on its (0001) surface, rationalizing several already-existing historic puzzles [Phys. Rev. Lett., \textbf{117}, 096401 (2016)]. However, to date the underlying mechanism, as to why its (0001) surface exhibits an anomalously large electron-phonon coupling effect ($\lambda_{e-ph}^s$ $\approx$ 1.0), remains unresolved. Here, by means of first-principles calculations we have evidenced that the coupling of the DNSSs with the phononic states mainly contributes to its novel surface \emph{e-ph} enhancement. Besides that the experimentally observed $\lambda_{e-ph}^s$ and the main Eliashberg coupling function (ECF) peaks have been reproduced well, we have decomposed the ECF, $\alpha^{2}$$F$(\emph{k},\textbf{\emph{q}};\emph{v}), and the \emph{e-ph} coupling strength $\lambda(\emph{k},\textbf{\emph{q}};\emph{v})$ as a function of each electron momentum (\emph{k}), each phonon momentum (\textbf{\emph{q}}) and each phonon mode ($v$), evidencing the robust connection between the DNSSs and both $\alpha^{2}$$F$(\emph{k},\textbf{\emph{q}};\emph{v

Author

Li, Ronghan; Li, Jiangxu; Wang, Lei; Ma, Hui; Li, Dianzhong; Li, Yiyi; Chen, Xing-Qiu

Published

2019

Language

EN