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Magnon BEC at Room Temperature and Its Spatio-Temporal Dynamics

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Abstract

Recent advances in the studies of magnon gases have opened new horizons for the investigation of room-temperature macroscopic coherent states and discovery of Bose–Einstein condensation of magnons. Although the phenomenon has been discovered almost 15 years ago, a lot of important issues connected with magnon Bose–Einstein condensation remain unclear. Here I review the recent experimental achievements in investigations of this phenomenon. I show that the magnon condensate possesses high degrees of temporal and spatial coherency, the latter leading to observation of interference of two condensate. Discovery of second sound in magnon condensate is also discussed. Finally, I demonstrate a practical way to realize magnon laser, which create a freely propagating cloud of magnons.

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ACKNOWLEDGMENTS

Finally, I would like to emphasize with many thanks a decisive role of A.S. Borovik-Romanov in my choice of magnetic dynamics as the main direction of my scientific carrier.

Funding

This work is a short review of original works performed at Münster University during more than a decade with financial support of Deutsche Forschungsgemeinschaft and European Union. This work supported in part by the Deutsche Forschungsgemeinschaft (project no. 416727653). I would like stress important contributions of V.E. Demidov, O. Dzyapko, G.A. Melkov, P. Nowik-Boltyk, N. Berloff, A.N. Slavin, and V. Tiberkevich to the above reported studies.

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  1. Institute for Applied Physics and Center for NanoTechnology, University of Muenster, 48149, Muenster, Germany

    S. O. Demokritov

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  1. S. O. Demokritov
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Correspondence to S. O. Demokritov.

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This article was prepared for the special issue dedicated to the centenary of A.S. Borovik-Romanov.

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Demokritov, S.O. Magnon BEC at Room Temperature and Its Spatio-Temporal Dynamics. J. Exp. Theor. Phys. 131, 83–94 (2020). https://doi.org/10.1134/S1063776120070158

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