Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.6: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Floquet dynamics of a chiral magnet — •Nina del Ser and Achim Rosch — University of Cologne

We investigate how the magnon spectrum of a chiral magnet is affected by the application of a time-dependent magnetic field. Our model is a 3D spin lattice Hamiltonian with Heisenberg and Dzyaloshinskii-Moriya interactions driven by a spatially uniform, sinusoidally time-varying magnetic field. We expand analytically around the ground state conical spin arrangement using the Holstein-Primakoff formalism for bosonic excitations. Floquet theory is used to make progress with the time-dependent problem. We investigate the resulting Floquet band structure and study the role of possible instabilities which may occur when the external driving frequency resonantly couples different branches of the magnon spectrum.