Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: INNOMAG e.V. Dissertationspreis 2018 / Ph.D. Thesis Prize

MA 14.2: Hauptvortrag

Montag, 12. März 2018, 15:25–15:50, H 0112

Topological Magnon Materials and Transverse Magnon Transport — •Alexander Mook — Institut für Physik, Martin-Luther-Universität, D-06120 Halle, Germany

Since Joule heating limits the efficiency of today's spintronics devices, electrons as carriers of information may be replaced by magnons, requiring a detailed understanding of magnon transport properties. Particularly fascinating magnon transport properties are found in topological magnon insulators that exhibit a thermal magnon Hall effect [1], calling for a general analysis of topological magnon materials like, for example, magnon Weyl semimetals [2] and magnon nodal-line semimetals [3]. I demonstrate how such topological magnon matter and its magnon Hall effects can be understood within linear spin-wave theory and Berry-phase theory. Moreover, I present a new method for the calculation of magnon transport based on atomistic spin dynamics simulations and the Green-Kubo relations. It is used to study the transverse magnon transport in the topological magnon insulator Cu(1,3-benzenedicarboxylate) [4] and in a skyrmion crystal [5].

[1] H. Katsura et al., Phys. Rev. Lett. 104, 066403 (2010); Y. Onose et al., Science 329, 297 (2010); R. Matsumoto et al., Phys. Rev. Lett. 106, 197202 (2011); A. Mook et al., Phys. Rev. B 89, 134409 (2014) [2] F.-Y. Li et al., Nature Commun. 7, 12691 (2016); A. Mook et al., Phys. Rev. Lett. 177, 157204 (2016) [3] A. Mook et al., Phys. Rev. B 95, 014418 (2017) [4] Hirschberger et al., Phys. Rev. Lett. 115, 106603 (2015); A. Mook et al., Phys. Rev. B 94, 174444 (2016) [5] A. Mook et al., Phys. Rev. B 95, 020401(R) (2017)