Impact of Interactions on Topological Magnonic Transport

The topological transport of magnons is a popular alternative to the electronic transport for novel spintronic applications due to the absence of Joule heating and the large range of frequencies in these systems. The magnonic transport has been investigated in various platforms (ferro- and antiferromagnets) and is characterized by anomalous mechanisms such as the thermal Hall effect and the magnon Nernst effect. The usually employed framework of Linear Spin Wave Theory, in fact, does not take into account effects as magnon

lifetime damping [1], energy renormalization [2] and topological phase transitions [3] that arise purely due to magnon-magnon interactions and can alter the flow of magnons dramatically. In this work we primarily investigate the results of three and four magnon interactions in the topologically non-trivial collinear honeycomb antiferromagnet and the results of these interactions in the magnon Spin Nernst effect. If time allows the impact of magnon interactions in a noncollinear antiferromagnet will also be addressed.

References

[1] A.L. Chernyshev and P.A. Maksimov. Damped topological magnons in the kagome-lattice ferromagnets. Physical Review Letters, 117(18):187203, 2016.

[2] A. Mook, K. Plekhanov, J. Klinovaja, and D. Loss. Interaction stabilized topological magnon insulator in ferromagnets. Physical Review X, 11(2):021061, 2021.

[3] Y.S. Lu, J.L. Li, and C.T. Wu. Topological phase transitions of dirac magnons in honeycomb ferromagnets. Physical Review Letters, 127(21):217202, 2021.