Bose–Einstein condensation of quasi-equilibrium magnons at room temperature under pumping

S. O. Demokritov (), V. E. Demidov, O. Dzyapko, G. A. Melkov, A. A. Serga, B. Hillebrands and A. N. Slavin
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S. O. Demokritov: Institute for Applied Physics, University of Münster
V. E. Demidov: Institute for Applied Physics, University of Münster
O. Dzyapko: Institute for Applied Physics, University of Münster
G. A. Melkov: National Taras Schevchenko University of Kiev
A. A. Serga: Fachbereich Physik, Technische Universität Kaiserslautern
B. Hillebrands: Fachbereich Physik, Technische Universität Kaiserslautern
A. N. Slavin: Oakland University

Nature, 2006, vol. 443, issue 7110, 430-433

Abstract: In from the cold Bose–Einstein condensation (BEC), a form of matter first postulated in 1924, has famously been demonstrated in dilute atomic gases at ultra-low temperatures. Much effort is now being devoted to exploring solid-state systems in which BEC can occur. In theory semiconductor microcavities, where photons are confined and coupled to electronic excitations leading to the creation of polaritons, could allow BEC at standard cryogenic temperatures. Kasprzak et al. now present experiments in which polaritons are excited in such a microcavity. Above a critical polariton density, spontaneous onset of a macroscopic quantum phase occurs, indicating a solid-state BEC. BEC should also be possible at higher temperatures if coupling of light with solid excitations is sufficiently strong. Demokritov et al. have achieved just that, BEC at room temperature in a gas of magnons, which are a type of magnetic excitation.

Date: 2006
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DOI: 10.1038/nature05117

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