We present evidence of all-optical trion generation and emission in pristine single-walled carbon nanotubes (SWCNTs). Luminescence spectra, recorded on individual SWCNTs over a large cw excitation intensity range, show trion emission peaks redshifted with respect to the bright exciton peak. Clear chirality dependence is observed for 22 separate SWCNT species, allowing for determination of elect...

: In this work, we study the exciton states in a zincblende InGaN/GaN quantum well using a variational technique. The system is considered under the action of intense laser fields with the incorporation of a direct current electric field as an additional external probe. The effects of these external influences as well as of the changes in the geometry of the heterostructure on the exciton bindi...

Within the Floquet theory of periodically driven quantum systems, we demonstrate that a high-frequency electromagnetic field can be used as an effective tool to control excitonic properties semiconductor dots (QDs). It is shown, particularly, both decreases exciton binding energy and dynamically stabilizes exciton, increasing its radiative lifetime. The developed serve basis for ultrafast metho...

We have calculated the optical absorption spectra of magnetoexcitons in T-wire semiconductor. It is calculated using the semiconductor Bloch equations in time and real-space domains. The peak and the linewitdth of the fundamental exciton transition are investigated as a function of the applied magnetic and static electric field. The latter is applied along the wire axis and induces a broadening...

Microcavity exciton-polaritons are two-dimensional bosonic quasiparticles composed by excitons and photons. Using model Hamiltonian with parameters generated from ab initio density-functional theory Bathe-Salpeter Equation calculations, we investigate the exciton exciton-polariton properties of hexagnonal boron nitride (hBN) based microcavity. We show that hBN microcavities, including monolayer...

Solar cells incorporating organic-inorganic perovskite, which may be fabricated using low-cost solution-based processing, have witnessed a dramatic rise in efficiencies yet their fundamental photophysical properties are not well understood. The exciton binding energy, central to the charge collection process, has been the subject of considerable controversy due to subtleties in extracting it fr...

We have examined in detail the optical properties of InGaN quantum wells ~QWs! grown on pyramidal GaN mesas prepared by lateral epitaxial overgrowth ~LEO! in a metalorganic chemical vapor deposition system that resulted in QWs on $1-101% facets. The effects of In migration during growth on the resulting QW thickness and composition were examined with transmission electron microscopy ~TEM! and v...

Using accurate first-principles quantum calculations based on DFT (including the DFPT) with the range-separated hybrid HSE06 exchange-correlation functional, we can predict the essential fundamental properties (such as bandgap, optical absorption co-efficient, dielectric constant, charge carrier effective masses and exciton binding energy) of two stable monoclinic vanadium oxynitride (VON) semi...

Saturation spectra of the excitons confined and localized at several kinds of stacking disorders in layered crystal Bi13 are studied. The quasi-two dimensional exciton localized at the stacking fault interface does not saturate its absorption strength below the density of 105W/cm2 due to the large binding energy and the lateral center-of-mass motion along the interface. On the exciton system as...

We have examined in detail crystal orientation effects on the properties of excitonic emission from wurtzite InxGa1−xN/GaN quantum wells (QWs) with piezoelectric polarization using exciton binding and transition energy calculations based on a single-band effective-mass theory. We show numerical results for the bandgaps, effective heavy-hole masses, piezoelectric polarizations and fields, excito...