Phonon- and charged-impurity-assisted indirect free-carrier absorption in Ga2O3

Phonon-Assisted Indirect Transitions in Cadmium Sulfate Crystals

für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namen...

Phonon-assisted optical absorption in silicon from first principles.

The phonon-assisted interband optical absorption spectrum of silicon is calculated at the quasiparticle level entirely from first principles. We make use of the Wannier interpolation formalism to determine the quasiparticle energies, as well as the optical transition and electron-phonon coupling matrix elements, on fine grids in the Brillouin zone. The calculated spectrum near the onset of indi...

Phonon-coupled impurity dielectric modes in Sr1À1.5xBixTiO3

SrTiO3 ~ST! doped with Bi shows three Bi-induced dielectric modes ~modes A, B, and C) that are superimposed upon the quantum paraelectric behavior of pure ST. In ST doped with low concentration Bi, the modes A and B exhibit dielectric behavior arising from noninteracting polar clusters. The evidence of the dielectric modes coupling with optical phonons is observed from Raman spectra. The dielec...

Modeling Free-carrier Absorption and Avalanching by Ultrashort Laser Pulses

In the past decade it was demonstrated experimentally that negatively-chirped laser pulses can lower the surface LIDT for wide band-gap materials by decreasing the number of photons required for photoionization on the leading edge of the pulse. Similarly, simulations have shown that positively-chirped pulses resulting from selffocusing and self-phase modulation in bulk dielectrics can alter the...

Near-infrared free carrier absorption in heavily doped silicon