Berlin 2015 – scientific programme

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KR: Fachgruppe Kristallographie

KR 3: Poster Session on Ferroic Domain Walls - Multiferroics (DF jointly with KR, MA, TT)

KR 3.18: Poster

Monday, March 16, 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.