Impurity absorption of light in structures with quantum dots

Spectral properties of a short-range impurity in a quantum dot

“…for the case of impurities in a quantum well (see numerical results in Ref. 14). Our arguments are valid in the two-dimensional case also, thus we have a strict proof for the positional disorder in a two-dimensional quantum well.…”

“…Point potential for modelling an impurity in a spherically symmetric quantum dot has been studied in the series of papers using the Green function representation by means of the Laplace transform of the propagator kernel, but this approach allows to analyze (with numerical methods) the lowest impurity level only. 6,13,14,15 It should be noted that point perturbations of the one-dimensional harmonic oscillators have been studied in detail earlier. This study was started in Ref.…”

Effect of dimensional and magnetic quantization hybridization in the optical absorption spectra of nanoheterosystems with D (?)-states

“…These QD states open new interesting possibilities for a study of correlation effects in low-dimensional systems. The zero-dimensional structure of D (-) -centers becomes apparent through a significant increase in binding energy [11] compared to the three-dimensional case. As demonstrated below, an increase in the D (-) -state population of QD can be due to hybrid quantization in a quantizing magnetic field.…”

Two-Dimensional D −-States in a Longitudinal Magnetic Field

“…1 and 3). This is caused by a cardinal modification of local electron states in the neighborhood of the quantum-dot boundaries [5]. The case of ( ) Fig.…”

“…where α is determined by the energy ( ) It should be noted that modeling of the D − center by an electron in the field of zero-radius potential was used in a number of calculations of the D − -state binding energy in quantum wires and dots [4,5], as well as in QWs with a confinement potential in the form of a rectangular potential well of finite depth [6]. The spectrum of the A + center was calculated in [7] within a model of zero-radius potential for the case of an infinitely deep QW.…”