Effects of impurity scattering on electron-phonon resonances in semiconductor superlattice high-field transport

A non-equilibrium Green's function method is applied to model high-field quantum transport and electron-phonon resonances in semiconductor superlattices. The field-dependent density of states for elastic (impurity) scattering is found non-perturbatively in an approach which can be applied to both high and low electric fields. I-V curves, and specifically electron-phonon resonances, are calculated by treating the inelastic (LO phonon) scattering perturbatively. Calculations show how strong impurity scattering suppresses the electron-phonon resonance peaks in I-V curves, and their detailed sensitivity to the size, strength and concentration of impurities.Comment: 7 figures, 1 tabl

INTERNAL FEEDBACK MECHANISMS OF OPTOELECTRONIC BISTABILITY IN CADMIUM SULFIDE

Two mechanisms of internal feedback in cadmium sulfide in electric field have been studied, namely, thermal shift of absorption lines and electron state transformation due to multiparticle interaction in the high carrier concentration system

Wave function reconstruction in a graded well-width semiconductor superlattice

We experimentally reconstruct a Wannier-Stark wave function by spectrally resolving exciton wave packet interferences employing non-degenerate Four-Wave-Mixing spectroscopy. Excellent agreement with a numerical model is achieved

Intraband dynamics of excitonic wave packets in a biased superlattice tested by THz emission

We find that the intraband dynamics of Bloch oscillations can only be understood in a complete excitonic picture. The results of THz emission experiments are modelled well by theory employing a full excitonic basis

Parabolic polarization splitting of Tamm states in a metal-organic microcavity

We observe hybrid states of cavity photons and Tamm plasmons in an organic microcavity with an incorporated thin silver layer of increasing thickness up to 40 nm. Via μ-photoluminescence spectroscopy, we investigate their angular dependence. At oblique angles, we observe a TE-TM polarization splitting of more than 40 meV for each mode. An analytical model is developed to describe the coupling of Tamm plasmons and cavity photons and to account for the splitting of the orthogonally polarized resonances