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Suppression of nonradiative recombination in ionic insulators by defects: Role of fast electron trapping in Tl-doped CsI
In semiconductors, defects often assist non-radiative relaxation. However, Tl doping can significantly suppress the non-radiative relaxation in alkali halides to increase scintillation efficiency. Without the Tl, it is known that the creation of Frenkel pairs at self-trapped excitons, assisted by excited electron and hole relaxations, is the reason for the non-radiative relaxation. Here we show by first-principles calculation that Tl doping introduces Tl p states inside the band gap to trap the excited electrons. The trapping is highly effective to within several ps, as revealed by time-dependent density functional theory calculations. It alters the non-radiative relaxation process to result in a noticeable increase in the relaxation barrier from 0.3 to 0.63 eV, which reduces the non-radiative relaxation by roughly a factor of 105 at room temperature.
First-principles calculations of indirect Auger recombination in nitride semiconductors
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Role of excited states in Shockley-Read-Hall recombination in wide-band-gap semiconductors
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Reply to “Comment on ‘Comparative study of ab initio nonradiative recombination rate calculations under different formalisms’ ”
As pointed out by the comments of Wickramaratne et al., there was indeed an algebra error in our original publication [Phys. Rev. B 91, 205315 (2015)] in calculating the 1D model. We have corrected this error, and did a renewed calculation and comparison of the 1D model and other approximated models. The revised comparison provides some insights for the origin of the difference between the full phonon spectrum electron-phonon coupling static formula results and other approximated results, especially for how to evaluate the amplitude of electron-phonon coupling.
Quarkonium inside the quark-gluon plasma: Diffusion, dissociation, recombination, and energy loss
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Constraining early dark energy with gravitational waves before recombination
In this work, we show that the nonperturbative decay of ultralight scalars into Abelian gauge bosons, recently proposed as a possible solution to the Hubble tension, produces a stochastic background of gravitational waves which is constrained by the cosmic microwave background. We simulate the full nonlinear dynamics of resonant dark photon production and the associated gravitational-wave production, finding the signals to exceed constraints for the entire parameter space we consider. Our findings suggest that gravitational-wave production from the decay of early dark energy may provide a unique probe of these models.
Reconstructing the recombination history by combining early and late cosmological probes
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DESI observations and the Hubble tension in light of modified recombination
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Stability of small-scale baryon perturbations during cosmological recombination
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Enhanced magnetization by defect-assisted exciton recombination in atomically thin CrCl 3
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