Theory of microwave superradiance from a Bose-Einstein condensate of magnons

Journal Article · Sun Feb 01 00:00:00 EST 2009 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.79.060410· OSTI ID:21192534

Rezende, Sergio M ^[1]

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1. Departamento de Fisica, Universidade Federal de Pernambuco, Recife, PE 50670-901 (Brazil)

We show that the nearly uniform mode generated by the confluence of Bose-Einstein condensate (BEC) magnon pairs produced by microwave radiation in a film of yttrium iron garnet (YIG) is a coherent magnon state. This state corresponds to a macroscopic precessing magnetization which emits a superradiant microwave signal as a result of the cooperative action of the spins. The theory explains quantitatively recent experimental observations of microwave emission from a BEC of magnons in a YIG film when the driving power exceeds a critical value.

• OSTI ID: 21192534
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 79, Issue 6; Other Information: DOI: 10.1103/PhysRevB.79.060410; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSE-EINSTEIN CONDENSATION
FERRITE GARNETS
IRON COMPOUNDS
IRON OXIDES
MAGNETIZATION
MAGNONS
MICROWAVE RADIATION
PAIR PRODUCTION
SPIN
SPIN WAVES
SUPERRADIANCE
THIN FILMS
YTTRIUM COMPOUNDS