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Laser-Driven Multiferroics and Ultrafast Spin Current Generation

Sato, Masahiro
Oka, Takashi
Published in Physical Review Letters. 2016, vol. 117, no. 14, p. 147202
Abstract We propose an ultrafast way to generate spin chirality and spin current in a class of multiferroic magnets using a terahertz circularly polarized laser. Using the Floquet formalism for periodically driven systems, we show that it is possible to dynamically control the Dzyaloshinskii-Moriya interaction in materials with magnetoelectric coupling. This is supported by numerical calculations, by which additional resonant phenomena are found. Specifically, when a static magnetic field is applied in addition to the circularly polarized laser, a large resonant enhancement of spin chirality is observed resembling the electron spin resonance. Spin current is generated when the laser is spatially modulated by chiral plasmonic structures and could be detected using optospintronic devices.
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Research group Groupe Giamarchi
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SATO, Masahiro, TAKAYOSHI, Shintaro, OKA, Takashi. Laser-Driven Multiferroics and Ultrafast Spin Current Generation. In: Physical Review Letters, 2016, vol. 117, n° 14, p. 147202. https://archive-ouverte.unige.ch/unige:92626

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Deposited on : 2017-03-15

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