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Optical manipulation of ferromagnet

Date: Tuesday, May 28, 2019 11:00 - 12:00
Speaker: Sanchar Sharma (TU Delft)
Location: Mondi Seminar Room 2, Central Building
Series: Physical Sciences Seminar
Host: Mikhail Lemeshko
Contact: PETZ Caroline

YIG (Yttrium Iron Garnet) is a material known for its excellent magnetic quality and magnons therein are expected to have long coherence time. But studies on quantum properties of magnons are scarce due to lack of a coherent interface to manipulate them. We theoretically argue that optical (infrared or visible) photons couple coherently and sufficiently strongly with magnons. We derive an upper limit of the coupling for a given material and discuss a geometry which nearly achieves that limit. We show that the thermal fluctuations of the magnons can be suppressed optically, analogous to laser cooling of atoms. Additionally, we can induce a large coherent component of the magnons, leading to a mesoscopic Bose-Einstein condensate.
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