Topic
Spontaneous emission
About: Spontaneous emission is a research topic. Over the lifetime, 12855 publications have been published within this topic receiving 323684 citations.
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TL;DR: Emission from hot low-density plasma due to bremsstrahlung, radiative recombination and electron collision-induced line emission was studied in this article, where the authors showed that the line emission can be caused by several factors.
Abstract: Emission from hot low-density plasma due to bremsstrahlung, radiative recombination and electron collision-induced line emission
74 citations
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TL;DR: In this article, the temperature dependence of electroluminescence (EL) spectral intensity of the super-bright green and blue InGaN single-quantum-well (SQW) light-emitting diodes has been studied over a wide temperature range (T=15-300 K) under a weak injection current of 0.1 mA.
Abstract: Temperature dependence of electroluminescence (EL) spectral intensity of the super-bright green and blue InGaN single-quantum-well (SQW) light-emitting diodes has been studied over a wide temperature range (T=15–300 K) under a weak injection current of 0.1 mA. It is found that when T is slightly decreased to 140 K, the EL intensity efficiently increases, as usually seen due to the improved quantum efficiency. However, with further decrease of T down to 15 K, it drastically decreases due to reduced carrier capture by SQW and trapping by nonradiative recombination centers. This unusual temperature-dependent evolution of the EL intensity shows a striking difference between green and blue SQW diodes owing to the different potential depths of the InGaN well. The importance of efficient carrier capture processes by localized tail states within the SQW is thus pointed out for enhancement of radiative recombination of injected carriers in the presence of the high-density dislocations.
73 citations
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TL;DR: In this paper, Zhu and Scully showed that the decay dynamics required for total suppression of spontaneous emission necessarily imply that the level scheme is isomorphic to a three-level lambda system, in which the lower two levels are metastable, and each is coupled to the decaying state.
Abstract: It has been shown recently [see, for example, S.-Y. Zhu and M. O. Scully, Phys. Rev. Lett. {\bf 76}, 388 (1996)] that a dynamical suppression of spontaneous emission can occur in a three-level system when an external field drives transitions between a metastable state and {\em two} decaying states. What is unusual in the decay scheme is that the decaying states are coupled directly by the vacuum radiation field. It is shown that decay dynamics required for total suppression of spontaneous emission necessarily implies that the level scheme is isomorphic to a three-level lambda system, in which the lower two levels are {\em both} metastable, and each is coupled to the decaying state. As such, the total suppression of spontaneous emission can be explained in terms of conventional dark states and coherent population trapping.
73 citations
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TL;DR: Using generalized Ginzburg-Landau equations derived recently, the authors solved the laser equations analytically for the case of spontaneous ultra-short laser pulses and compared their results with previous computer solutions by Risken and Nummedal.
73 citations
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TL;DR: A plasmon-induced electron-electron interaction is identified as the source of experimentally observed above-threshold light emission from biased STM contacts.
Abstract: We develop a theoretical framework for the description of light emission from plasmonic contacts based on the nonequilibrium Green function formalism. Our theory establishes a fundamental link between the finite-frequency quantum noise and ac conductance of the contact and the light emission. Calculating the quantum noise to higher orders in the electron-plasmon interaction, we identify a plasmon-induced electron-electron interaction as the source of experimentally observed above-threshold light emission from biased STM contacts. Our findings provide important insight into the effect of interactions on the light emission from atomic-scale contacts.
73 citations