Wei-Wang Yu

Jun 13, 2024 | link.aps.org | Chenyang Wang |Lei Jin |Lu Tian |Wei-Wang Yu

Topological phonons have attracted tremendous attention in recent years, particularly when topological phonons have nonzero topological numbers and exhibit many peculiar physical phenomena. However, studies on the coexistence of different phonons with nonzero topological charge are quite limited. Here, we reveal a realist material K2Pb2O3, which can realize the coexistence of three types of phonons, namely charge-1 Weyl point (WP), charge-2 triple point (TP), and charge-4 WP.

Jul 26, 2023 | link.aps.org | Wei-Wang Yu |Chenyang Wang |Xiaoming Zhang |Guodong Liu

Abstract Hourglass nodal loops have garnered significant attention due to their unique band dispersion; yet their existence in two-dimensional (2D) solid materials has been scarcely studied, particularly in spinless phonon systems. While recent solutions have been proposed for spin systems, none have been proposed for spinless 2D phonon systems. In this paper, we perform a thorough search of all 80 layer groups (LGs) and identify only three LGs capable of hosting hourglass nodal loop phonons.