Work

Semimetals without correspondence between the topological charge of nodal line/surface and Fermi arc

Year: 2025

Type: article

Abstract: It is generally believed that there is a correspondence between the topological charge of nodal points or lines and the presence of Fermi arcs. Using a $\mathcal{P}\mathcal{T}$-invariant system as an example, we demonstrate that this general belief is no longer valid. When two charged nodal lines or surfaces touch, the topological charge dissipates without gap opening, yet the surfaces or hinge Fermi arcs can remain preserved. It is found that both static and Floquet semimetals can exhibit Fermi arcs, even when the nodal lines or surfaces do not carry a ${Z}_{2}$ charge from the second Stiefel-Whitney class.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.111.l161119

Authors: Xue-Min Yang, Jiang-Shan Chen, Ying Chen, Yu-Hang Qin, Hong Wu

Institution: Chongqing University of Posts and Telecommunications

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, Chongqing University of Posts and Telecommunications, Natural Science Foundation of Chongqing, Chongqing Municipal Education Commission