Magnon Bose–Einstein Condensate and Supercurrents Over a Wide Temperature Range

Mihalceanu, Laura; Bozhko, Dmytro A.; Vasyuchka, Vitaliy I.; Serga, Alexander A.; Hillebrands, B.; Pomyalov, Anna; L’vov, Victor S.; Tyberkevych, Vasyl

doi:10.15407/ujpe64.10.927

Cited by 7 publications

(3 citation statements)

References 39 publications

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“…For instance, there are only a few experiments done at room temperature to demonstrate the possibility of magnon state squeezing [452], magnon BEC supercurrents, and Bogoliubov waves [429], [430], [453]. The only attempt to study magnon BEC at cryogenic temperatures was reported in [454] but a thorough investigation in the quantum limit is still needed.…”

Section: B Yig-based Quantum Magnonicsmentioning

confidence: 99%

Advances in Magnetics Roadmap on Spin-Wave Computing

et al. 2022

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Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in the GHz-to-THz frequency range, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS are just a few of many advantages offered by magnons. Although magnonics is still primarily positioned in the academic domain, the scientific and technological challenges of the field are being extensively investigated, and many proof-of-concept prototypes have already been realized in laboratories. This roadmap is a product of the collective work of many authors that covers versatile spin-wave computing approaches, conceptual building blocks, and underlying physical phenomena. In particular, the roadmap discusses the computation operations with Boolean digital data, unconventional approaches like neuromorphic computing, and the progress towards magnon-based quantum computing. The article is organized as a collection of sub-sections grouped into seven large thematic sections. Each sub-section is prepared by one or a group of authors and concludes with a brief description of current challenges and the outlook of further development for each research direction.

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Section: B Yig-based Quantum Magnonicsmentioning

confidence: 99%

Advances in Magnetics Roadmap on Spin-Wave Computing

et al. 2022

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“…Alternatively, magnon BEC coherence can be tested indirectly by observation of phenomena such as quantized vorticity [29], supercurrents [30], Bogoliubov waves [31], or Josephson oscillations [32], which are canonical features of both atomic and quasiparticle quantum condensates. Our studies of some of these phenomena [30][31][32][33][34] have shown that they occur only in a freely evolving magnon gas after switching off the microwave pumping. This takes place probably because the intense pumping process prevents condensation by heating the magnon gas [13] and mixing the magnon frequencies near the bottom of their spectra [28].…”

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confidence: 90%

Evolution of room-temperature magnon gas toward coherent Bose-Einstein condensate

Noack,

Vasyuchka,

Pomyalov

et al. 2021

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The appearance of spontaneous coherence is a fundamental feature of a Bose-Einstein condensate and an essential requirement for possible applications of the condensates for data processing and quantum computing. In the case of a magnon condensate in a magnetic crystal, such computing can be performed even at room temperature. So far, the process of coherence formation in a magnon condensate was inaccessible. We study the evolution of magnon radiation spectra by direct detection of microwave radiation emitted by magnons in a parametrically driven yttrium iron garnet crystal. By using specially shaped bulk samples, we show that the parametrically overpopulated magnon gas evolves to a state, whose coherence is only limited by the natural magnon relaxation into the crystal lattice.

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“…Very recently, the fields of quantum magnonics and magnonics at cryogenic temperatures were established. Among the highlights, one should mention the first realization of coherent coupling between a ferromagnetic magnon and a superconducting qubit [32], the first observation of the interaction between magnons and Abrikosov fluxes in superconductorferromagnet hybrid structures [33], the investigation of the interplay of the magnetization dynam-ics with a microwave waveguide at cryogenic temperatures [34] and many more interesting phenomena [35][36][37]. Thus, the understanding of the influence of the temperature on spin pinning conditions and on the spin-wave dispersion in nanostructures is of high demand.…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of Spin Pinning and Spin-Wave Dispersion in Nanoscopic Ferromagnetic Waveguides

et al. 2020

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The field of magnonics attracts significant attention due to the possibility of utilizing information coded into the spin-wave phase or amplitude to perform computation operations on the nanoscale. Recently, spin waves were investigated in Yttrium Iron Garnet (YIG) waveguides with widths down to 50 nm and aspect ratios of thickness to width approaching unity. A critical width was found, below which the exchange interaction suppresses the dipolar pinning phenomenon, and the system becomes unpinned. Here, we continue these investigations and analyze the pinning phenomenon and spin-wave dispersion as functions of temperature, thickness, and material parameters. Higher order modes, the influence of a finite wavevector along the waveguide, and the impact of the pinning phenomenon on the spin-wave lifetime are discussed, as well as the influence of a trapezoidal cross-section and edge roughness of the waveguide. The presented results are of particular interest for potential applications in magnonic devices and the incipient field of quantum magnonics at cryogenic temperatures.

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Magnon Bose–Einstein Condensate and Supercurrents Over a Wide Temperature Range

Cited by 7 publications

References 39 publications

Advances in Magnetics Roadmap on Spin-Wave Computing

Advances in Magnetics Roadmap on Spin-Wave Computing

Evolution of room-temperature magnon gas toward coherent Bose-Einstein condensate

Temperature Dependence of Spin Pinning and Spin-Wave Dispersion in Nanoscopic Ferromagnetic Waveguides

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