Understanding and tuning the interplay between electronic topology and magnetism in magnetic topological materials

Huibo Cao2, Neutron Scattering Scientist

Magnetic topological semimetals (MTS) are a rapidly emerging class of materials at the forefront of condensed matter physics, offering transformative potential for fields such as spintronics, quantum computing, and catalysis. These materials exhibit a unique interplay between magnetism and electronic topology, leading to exotic transport phenomena like the anomalous and topological Hall effects. However, the fundamental relationship between magnetism and topology in MTS remains elusive. This research seeks to explore that relationship by focusing on two families of rare-earth-based, noncentrosymmetric MTS compounds.

This project will investigate two key mechanisms: (i) topology-mediated magnetism, where electronic topology influences magnetic interactions, and (ii) magnetism-driven topology, where magnetism controls topological states. By applying physical and chemical pressure, the project aims to systematically tune the magnetic and electronic band structures of these materials to better understand their electronic and magnetic responses. This approach will allow researchers to uncover how the interaction between magnetic order and electronic topology can be harnessed and manipulated, providing insights that could lead to the development of tunable materials for advanced technological applications.

This research will not only generate new insights into MTS but also promote accessibility and inclusivity in scientific research. The project will enhance Kennesaw State University's research capabilities and provide hands-on training and impactful opportunities for students in collaboration with Oak Ridge National Laboratory, thus fostering the next generation of scientists in this critical field. By investigating these novel materials, this project will contribute to advancing high-impact technologies and enabling scientific breakthroughs in energy-efficient, next-generation devices.

This research was selected for funding by the Office of Basic Energy Sciences.