Graduate student, Qiuchen Wu will present his comprehensive exam topic, “Altermagnetism: Emerging Materials and Phenomena” in person.

Abstract: Altermagnetism is an emerging magnetic phase which possesses broken time-reversal symmetry, antiparallel magnetic order, and staggered spin-splitting energy band spectrum. In recent years, inspiring progress has been made in both theoretical and experimental explorations of this novel magnetic phase. This report provides a comprehensive review of the latest developments in the field of altermagnetism. We discuss the fundamental physical concepts of altermagnetism, explain the time-reversal symmetry and lifted Kramers degeneracy in altermagnets (AMs), and describe two kinds of altermagnetic quasiparticle models. The experimental evidence of AMs has also been exhibited. In addition, we systematically review the related physical properties involved in AMs, including anomalous Hall effect, electrical spin splitter effect, and magneto-optical effect. We also discuss the strategies for inducing altermagnetism from conventional ferromagnets and antiferromagnets. Finally, we present one potential research proposal of altermagnetic tunnel junctions which can be achieved in this field.