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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 97: Spincaloric Transport I (organized by MA)

TT 97.8: Talk

Thursday, April 3, 2014, 18:30–18:45, HSZ 403

Magnon Hall effect and topology in kagomé lattices: A theoretical investigation — •Alexander Mook1, Jürgen Henk2, and Ingrid Mertig1,21Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle — 2Institut für Physik, Martin-Luther-Universität, D-06120 Halle

Ferromagnetic insulators with Dzyaloshinskii-Moriya interaction show the magnon Hall effect, i. e., a transverse heat current upon application of a temperature gradient [1,2]. In our theoretical investigation we establish a close connection of the magnon Hall effect in two-dimensional kagomé lattices with the topology of their magnon dispersion relation. From the topological phase diagram we predict systems which show a change of sign in the heat current in dependence of the temperature. Furthermore, we derive a high-temperature limit of the thermal Hall conductivity; this quantity provides a figure of merit for the strength of the magnon Hall effect. Eventually, we compare the temperature dependence of the magnon Hall conductivity of the three-dimensional pyrochlore Lu2V2O7 with experiment.


[1] Y. Onose et al., Science 329, 297 (2010).
[2] R. Matsumoto, S. Murakami, Phys. Rev. B 84, 184406 (2011).

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