Confinement of Bose–Einstein magnon condensates in adjustable complex magnetization landscapes
- Coherent wave states such as Bose–Einstein condensates (BECs), which spontaneously form in an overpopulated magnon gas even at room temperature, have considerable potential for wave-based computing and information processing at microwave frequencies. The ability to control the transport properties of magnon BECs plays an essential role in their practical use. Here, we demonstrate the spatiotemporal control of the BEC density distribution through the excitation of magnon supercurrents in an inhomogeneously magnetized yttrium iron garnet film. The BEC is created by microwave parametric pumping and probed by Brillouin light scattering spectroscopy. The desired magnetization profile is prepared by heating the film with optical patterns projected onto its surface using a phase-based wavefront modulation technique. Specifically, we observe a pronounced spatially localized magnon accumulation caused by magnon supercurrents flowing toward each other originating in two heated regions. This accumulation effect increases the BEC lifetime due to the constant influx of condensed magnons into the confinement region. The shown approach to manipulate coherent waves provides an opportunity to extend the lifetime of freely evolving magnon BECs, create dynamic magnon textures, and study the interaction of magnon condensates formed in different regions of the sample.
Author: | Matthias R. SchweizerORCiD, Alexander J. E. KreilORCiD, Georg von FreymannORCiD, Burkard HillebrandsORCiD, Alexander A. SergaORCiD |
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URN: | urn:nbn:de:hbz:386-kluedo-81410 |
DOI: | https://doi.org/10.1063/5.0123233 |
ISSN: | 1089-7550 |
Parent Title (English): | Journal of Applied Physics |
Publisher: | AIP |
Document Type: | Article |
Language of publication: | English |
Date of Publication (online): | 2024/04/29 |
Year of first Publication: | 2022 |
Publishing Institution: | Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau |
Date of the Publication (Server): | 2024/04/29 |
Issue: | 132/18 |
Page Number: | 9 |
Source: | https://pubs.aip.org/aip/jap/article/132/18/183908/2837792/Confinement-of-Bose-Einstein-magnon-condensates-in |
Faculties / Organisational entities: | Kaiserslautern - Fachbereich Physik |
DDC-Cassification: | 5 Naturwissenschaften und Mathematik / 530 Physik |
Collections: | Open-Access-Publikationsfonds |
Licence (German): | Zweitveröffentlichung |