Thursday 27 March 2025
Researchers have made a significant breakthrough in the field of topological materials, discovering a way to create two-dimensional higher-order Weyl semimetals. These materials exhibit exotic properties that could lead to new technologies for manipulating quantum information.
The discovery was made by scientists who used a combination of theoretical and experimental approaches to create a trilayer topological insulator film with an out-of-plane d-wave altermagnet. This unique arrangement allowed them to induce a gap in the helical edge states while preserving two bulk Weyl points, creating a higher-order Weyl semimetal.
Higher-order Weyl semimetals are a type of topological material that exhibits a higher order of topology than traditional topological insulators. They have unique properties, such as the ability to host corner states, which are protected by topology and can be used to manipulate quantum information.
The researchers’ approach involved creating a trilayer film consisting of a topological insulator material sandwiched between two layers of an altermagnetic material. The d-wave altermagnet was found to have a significant impact on the properties of the material, inducing a gap in the helical edge states while preserving the bulk Weyl points.
Theoretical calculations and experimental measurements confirmed that the created material exhibited the characteristics of a higher-order Weyl semimetal. The researchers observed corner states at the edges of the sample, which were found to be protected by topology.
These findings have significant implications for the development of new technologies that rely on the manipulation of quantum information. Higher-order Weyl semimetals could potentially be used to create ultra-efficient data storage devices or secure communication networks.
The researchers’ approach also has potential applications in other fields, such as materials science and condensed matter physics. The ability to create higher-order topological materials with specific properties could lead to new discoveries and innovations in these areas.
Overall, this breakthrough represents a major step forward in the field of topological materials and has significant implications for the development of new technologies that rely on quantum information manipulation.
Cite this article: “Creation of Two-Dimensional Higher-Order Weyl Semimetals”, The Science Archive, 2025.
Topological Materials, Weyl Semimetals, Higher-Order Topology, Quantum Information, Corner States, Edge States, Topological Insulators, Altermagnetism, D-Wave Altermagnet, Trilayer Film
Reference: Lizhou Liu, Qing-Feng Sun, Ying-Tao Zhang, “Two-dimensional higher-order Weyl semimetals” (2025).
