A bstract Many kink solutions enjoy internal excitations, called shape modes. In some 1+1d scalar models, such as the ? 4 double-well model, when a kink’s mode is excited twice it may decay to ground state plus meson. We analytically calculate rates of both twice-excited and also coherent corresponding classically mode. case we find that latter agrees with classical result Manton Merabet.

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Using time-resolved photoluminescence measurements, the recombination rate in an In0.18Ga0.82N/GaN quantum well ~QW! is shown to be greatly enhanced when spontaneous emission is resonantly coupled to a silver surface plasmon. The rate of enhanced spontaneous emission into the surface plasmon was as much as 92 times faster than QW spontaneous emission into free space. A calculation, based on Fer...

We report our observation of the signature of photon periodic orbits in the spontaneous emission spectra of large-aperture vertical-cavity surface-emitting lasers (VCSELs). The high-resolution measurement clearly demonstrates that over a thousand cavity modes with a narrow linewidth can be perfectly exhibited in the spontaneous emission spectrum just below the lasing threshold. The Fourier-tran...

We present a general theory of spontaneous emission at exceptional points (EPs)-exotic degeneracies in non-Hermitian systems. Our theory extends beyond spontaneous emission to any light-matter interaction described by the local density of states (e.g., absorption, thermal emission, and nonlinear frequency conversion). Whereas traditional spontaneous-emission theories imply infinite enhancement ...