The method of detection and investigation of the magnetopolaron effect in the semiconductor quantum wells (QW) in a strong magnetic field, based on pulse light irradiation and measuring the reflected and transmitted pulses, has been proposed. It has been shown that a beating amplitude on the frequencies, corresponding to the magnetopolaron energy level splitting, depends strongly on the exciting pulse width. The existence of the time points of the total reflection and total transparency has been predicted. The high orders of the perturbation theory on electron-electromagnetic field interaction have been taken into account.
A theory of light transmission through a quantum well (QW) in a magnetic field perpendicular to the QW plane is developed. The light wave length is supposed comparable with the QW width. The formulas for reflection, absorption and transmission take into account the spatial dispersion of the light monochromatic wave and a difference of the refraction indexes of the QW and barrier. We suppose a normal light incidence on the QW plane and consider only one excited energy level. These two factors influence mostly light reflection, since an additional reflection from the QW borders appears to the reflection due to interband transitions in the QW. The most radical changes in reflection appear when a radiative broadening of the excited energy level is small in comparison to a nonradiative broadening. Our theory is limited by the condition of existence of size-quantized energy levels which is satisfied for quite narrow QW's.
The magnetopolaron wave function and energy for resonantly coupled electronic and vibrational excitations in a quantum well are derived and used to evaluate the efficiency of Raman scattering by two LO phonons. A strong increase of the scattering intensity along with the splitting of Raman peaks is predicted in the magnetopolaron regime.
The light absorption A and reflection R coefficients for a three-level system in a quantum well (QW) in a strong magnetic field H, directed perpendicularly to the QW's plane, have been calculated. The energy levels correspond to the ground state and to magnetopolaron energy levelshω 1(2) with the inverse lifetimes γ r1(2) and γ 1(2) . The inverse radiative lifetime of an EHP γ rξ (K ⊥ ) = 0 only under condition K ⊥ ≤ ω ξ n/c, wherehω ξ is the EHP energy. It has been shown that γ rξ (K ⊥ ) is proportional to H. The values γra(K ⊥ ) and γ rb (K ⊥ ) for an excitation consisting of a hole and a usual magnetopolaron have been calculated. The index a(b) designates a magnetopolaron upper (lower) term. In the resonance at Hres = mecωLO/|e| γ res ra = γ res rb = γ res rξ 0 /2, where the index ξ0 corresponds to the EHP with ne = n h = 1. γra and γ rb are strongly dependent on H − Hres. A numerical estimate for GaAs is: γ res rξ 0 = γ0 = 5.35 · 10 −5 eV. The dependencies A(H) and R(H) for various values of ω l in the magnetophonon resonance vicinity have been obtained. The existence of "combined"and "weak" polarons has been predicted. The resonant value Hres for the combined polaron case depends on a QW's depth and width.
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