Optical constants of In0.53Ga0.47As/InP: Experiment and modeling

Abstract

Energy dependence of electron effective mass and effect of wave function confinement in a nanoscale In0.53Ga0.47As/In0.52Al0.48As quantum well

Determination and modeling of the optical constants of direct band gap Be x Zn 1− x Te grown by molecular beam epitaxy

“…In order to calculate R 1 using the k⋅p theory we follow the procedure provided in Ref. [4], with the high frequency dielectric constant ε(∞) = 7.28 and the matrix element E p = 23 eV [7]. The results of this calculation are R 1 = 244, 253, 256, and 261 meV for beryllium compositions x = 0, 0.03, 0.10, and 0.19, respectively.…”

“…References [8] and [9] have demonstrated that even if the E 0 exciton is not resolved, the Coulomb interaction still affects the band-to-band line shape. Thus, ε 2 (E) is given by [4] …”

“…The experimental data over the entire measured spectral range has been fit using the Holden-Muñoz model [4] dielectric function which is based on the electronic energy-band structure near these CPs plus excitonic and BBCE effects at E 0 , E 0 +∆ 0 , and the E 1 , E 1 +∆ 1 , doublet. The data near the E 0 band gap were fit to a function which contains Lorentzian-broadened (a) discrete excitonic (DE) and (b) 3D M 0 BBCE contributions.…”

“…The ε(E) spectra of the different samples displayed distinct structures associated with CPs at E 0 , E 0 +∆ 0 E 1 , E 1 +∆ 1 , the e 1 +∆ 1 feature, as well as E 2 . The experimental data over the entire measured spectral range has been fit using the Holden-Muñoz model [4] dielectric function, which is based on the electronic energy-band structure near the CPs plus excitonic and BBCE effects. In addition to evaluating the energies of these various band-to-band CPs, information about the binding energy (R 1 ) of the two-dimensional exciton related to the E 1 and E 1 +∆ 1 CPs was obtained.…”

“…The nature of e 1 +∆ 1 and E 2 features is more complicated in relation to E 0 , E 0 +∆ 0 and E 1 , E 1 +∆ 1 since they do not correspond to a single, well-defined CP. Therefore, each was described by a damped harmonic oscillator term [4] with an amplitude F and broadening parameter γ. A constant ε 1∞ was added to the real part of the dielectric constant to account for the vacuum plus contributions from higher-lying energy gaps ( 0 E′ , etc.).…”