Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 104: Topological Insulators II (jointly with MA, DS, HL, O)
TT 104.5: Vortrag
Donnerstag, 19. März 2015, 16:00–16:15, EB 202
Magnon waveguides from topological magnon insulators — •Alexander Mook1, Jürgen Henk2, and Ingrid Mertig1,2 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle — 2Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Halle
Topological magnon insulators exhibit a nontrivial topology due to the Dzyaloshinskii-Moriya interaction. They host topologically nontrivial edge magnons and, consequently, energy as well as spin currents along their edges [1,2].
Bringing two topological magnon insulators into contact results in topologically protected unidirectional interface magnons. As these interface modes decay toward both bulk regions, their currents are confined to a few nanometer wide strip around the interface. Owing to the topological nature of the edge states, the edge currents follow any geometry.
We address theoretically the formation of interface edge magnons and their currents. On top of this, we propose recipes to compose magnon waveguides with nano-scale confinement.
[1] L. Zhang et al., PRB 87, 144101 (2013).
[2] A. Mook et al., PRB 90, 024412 (2014).