Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.41: Poster
Wednesday, March 18, 2020, 15:00–18:00, P3
Spin transport in topological Floquet magnon insulator — •Jun-Hui Zheng1, Roberto Troncoso1, Walter Hofstetter2, and Arne Brataas1 — 1Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway — 2Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt am Main, Germany
In topological insulators, the edge states dominate transport at low temperature. In contrast, topological magnon insulators usually have relatively high-energy edge states. The spin transport is mainly arising from the bulk magnon states. Topological protected edge states are perfect channels for transport due to their robustness against disorder. Enhancing their occupation benefits the efficiency of transport. One method is to excite edges states by photons, a proposed amplification mechanism. Another possibility is to lower the energy of the edge states. Here we show that, by moderately driving the system, we can realize topologically protected edge states with zero energy, and amplify the contribution of spin transport from edge states.