Spectroscopy: I. atomic spectra

Abstract

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Two-dimensional photonic crystals applied in high-performance meta-systems

“…Another approach is known as self-ionization [24], where atoms are excited to quasi-discrete energy levels and undergo ionization by emitting an electron into a continuous state, given by:…”

Coherent control of magnon radiative damping with local photon states

“…Due to the coherent coupling between magnon and photon, the energy of excited magnon would radiate to the photons that travel away from the magnetic sphere. This can be pictured as the "auto-ionization" of magnon into the propagating continuous state that induces the photon emission from magnon and hence magnon radiative damping [51,52]. Such "additional" magnon dissipation induced by photon states can be rigorously calculated by the imaginary part of self-energy in magnon Green's function that is expressed as ∆E m = δ m + π | g(ω)| 2 D(ω).…”

“…Here, δ m is the intrinsic dissipation rate of magnon mode, D(ω) represents the global density of states for the whole cavity that is a count of the number of modes per frequency interval. We note that above radiative damping is established when the on-shell approximation is valid with energy shift of magnon (tens to hundreds of MHz) is much smaller than its frequency (several GHz) (see Supplementary Note 1) [51,52]. By further defining the magnon broadening in terms of magnetic field ∆E = γµ 0 ∆H, the magnon linewidth is ex- spectra is measured at fixed frequencies 11.64 GHz (e), 12.14 GHz (f) and 12.64 GHz (g), respectively, with the x-axis offset Hm being the biased static magnetic field at magnon resonance.…”