Topological Spin Transport in Two-dimensional Magnets

Recently discovered two-dimensional magnets have been shown to support a variety of new spin-transport phenomena, which have not been found in bulk magnets. In this talk, we will discuss two illuminating examples in this research direction. The first topic is a magnonic topological insulator realized in an easy-axis two-dimensional ferromagnet such as CrI₃, which is shown to give rise to the thermal Hall effect via the finite Berry curvature of magnons [1]. The second one is a magnetic Berezinskii-Kosterlitz-Thouless (BKT) transition in easy-plane 2D magnets [2]. The talk will be concluded with a future outlook on novel types of spin-transport phenomena in more general two-dimensional magnets.

References:

[1] S. K. Kim, H. Ochoa, R. Zarzuela, and Y. Tserkovnyak, “Realization of the Haldane-Kane-Mele Model in a System of Localized Spins,” Phys. Rev. Lett. 117, 227201 (2016).

[2] S. K. Kim and S. B. Chung, "Transport Signature of the Magnetic Berezinskii-Kosterlitz-Thouless Transition," SciPost Phys. 10, 068 (2021).