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• W2896883359 abstract "Polaritons in metals, semimetals, semiconductors, and polar insulators, with their extreme confinement of electromagnetic energy, provide many promising opportunities for enhancing typically weak light-matter interactions such as multipolar radiation, multiphoton spontaneous emission, Raman scattering, and material nonlinearities. These highly confined polaritons are quasi-electrostatic in nature, with most of their energy residing in the electric field. As a result, these electric polaritons are far from optimized for enhancing emission of a magnetic nature, such as spin relaxation, which is typically many orders of magnitude slower than corresponding electric decays. Here, we propose using surface magnon polaritons in negative magnetic permeability materials such as MnF$_2$ and FeF$_2$ to strongly enhance spin-relaxation in nearby emitters in the THz spectral range. We find that these magnetic polaritons in 100 nm thin-films can be confined to lengths over 10,000 times smaller than the wavelength of a photon at the same frequency, allowing for a surprising twelve orders of magnitude enhancement in magnetic dipole transitions. This takes THz spin-flip transitions, which normally occur at timescales on the order of a year, and forces them to occur at sub-ms timescales. Our results suggest an interesting platform for polaritonics at THz frequencies, and more broadly, a new way to use polaritons to control light-matter interactions." @default.
• W2896883359 created "2018-10-26" @default.
• W2896883359 creator A5013737776 @default.
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• W2896883359 creator A5053008716 @default.
• W2896883359 creator A5060426875 @default.
• W2896883359 creator A5082242499 @default.
• W2896883359 date "2019-12-30" @default.
• W2896883359 modified "2023-10-13" @default.
• W2896883359 title "Controlling spins with surface magnon polaritons" @default.
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• W2896883359 doi "https://doi.org/10.1103/physrevb.100.235453" @default.
• W2896883359 hasPublicationYear "2019" @default.
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