Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Poster Session on Ferroic Domain Walls - Multiferroics (jointly with DF, KR, MA)
TT 28.18: Poster
Montag, 16. März 2015, 19:00–21:00, Poster C
Multiferroic magnonics: quantum interference, dissipationless energy transport, and Majorana fermions — •Wei Chen1, Manfred Sigrist2, Andreas P. Schnyder1, Peter Horsch1, and Dirk Manske1 — 1Max Planck Institute for Solid State Research, Stuttgart — 2ETH-Zurich, Zurich, Switzerland
We demonstrate the broad applications of multiferroic materials based on their noncollinear magnetic order and magnetoelectric effect. Upon mapping the noncollinear magnetic order into a spin superfluid, the magnetoelectric effect enables the electrically controlled quantum interference of spin superfluid, indicating the possibility of a room temperature SQUID-like quantum interferometer that manifests the flux quantization of electric field. Because the magnetoelectric effect enables changing the noncollinear magnetic order by electric field, we propose that applying an oscillating electric field with frequency as low as household frequency can generate a fast, coherent rotation of the magnetic order that is free from energy loss due to Gilbert damping, and can be used to deliver electricity up to the distance of long range order. At a superconductor/multiferroic interface, the noncollinear magnetic order imprints into the superconductor via s−d coupling, which can produce Majorana fermions at the edge of the superconductor without the need to adjust chemical potential.