AUTHOR=Li Yang 

TITLE=Ideal nodal net phonons in Pn3¯m type Ag2O

JOURNAL=Frontiers in Physics

VOLUME=10

YEAR=2023

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.1107783

DOI=10.3389/fphy.2022.1107783

ISSN=2296-424X

ABSTRACT=<p>The topological phonon state is a new field that has sparked much interest. Weyl phonons in FeSi, for example, have been theoretically proposed and experimentally identified. In this work, <italic>via</italic> the first-principle calculation, we prove the ideal nodal net phonons exist in a realistic material Ag<sub>2</sub>O with <inline-formula id="inf1"><mml:math id="m1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>P</mml:mi><mml:mi>n</mml:mi><mml:mover accent="true"><mml:mn>3</mml:mn><mml:mo>¯</mml:mo></mml:mover><mml:mi>m</mml:mi></mml:mrow></mml:math></inline-formula> type structure. With the help of the Berry phase calculations, we find that the nodal net phonons in Ag<sub>2</sub>O are topologically non-trivial. The phononic surface states are visible, which benefits the experimental detections. The results in this work contribute to the material realization of topological nodal net phonons. The author hopes the experimental verification of the novel topological phonons can be performed in the following investigations.</p>