Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 47: Spincaloric Transport I (jointly with TT)
MA 47.8: Vortrag
Donnerstag, 3. April 2014, 18:30–18:45, HSZ 403
Magnon Hall effect and topology in kagomé lattices: A theoretical investigation — •Alexander Mook1, Jürgen Henk2, and Ingrid Mertig1,2 — 1Max-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).