Topological Phases in Magnonics

Abstract

Magnonics or magnon spintronics is an emerging field focusing on generating, detecting, and manipulating magnons. As charge‐neutral quasi‐particles, magnons are promising information carriers because of their low energy dissipation and long coherence length. In the past decade, topological phases in magnonics have attracted intensive attention due to their fundamental importance in condensed‐matter physics and potential applications of spintronic devices. In this review, we mainly focus on recent progress in topological magnonics, such as the Hall effect of magnons, magnon Chern insulators, topological magnon semimetals, etc. In addition, the evidence supporting topological phases in magnonics and candidate materials are also discussed and summarized. The aim of this review is to provide readers with a comprehensive and systematic understanding of the recent developments in topological magnonics.

Topological magnons in a non-coplanar magnetic order on the triangular lattice

“…Topologically non-trivial magnons can be driven by a thermal gradient, forming transverse heat currents by the Berry phase mechanism [19]. This is called the thermal Hall effect [20][21][22][23][24][25][26][27][28][29][30][31][32], which has been experimentally observed in pyrochlore [21,23] and kagome [11,27] ferromagnets. Relevant research has been in full swing [29,33].…”

Coupled Electronic and Magnonic Topological States in Two-Dimensional Ferromagnets

“…Their movement and excitation primarily involve variations in magnetic moments or spins, and thus it can be considered that the magnons are chargeless . Therefore, given the rising attention toward topological magnon insulators (TMIs), , a natural question arises as to whether the coexistence of electronic SOTIs and first-order TMIs in real materials is possible. In fact, there have been various studies exploring the coexistence of multiple topological properties in materials.…”