Abstract

LANG, I.G.; KOROVIN, L.I.; CONTRERAS-SOLORIO, D.A.  and  PAVLOV, S.T.. An echo of an exciting light pulse in quantum wells. Rev. mex. fis. [online]. 2004, vol.50, n.4, pp.343-345. ISSN 0035-001X.

It is shown that non-sinusoidal oscillations appear in transmitted, reflected and absorbed light fluxes when light pulses irradiate a semiconductor quantum well (QW) containing a large number of equidistant energy levels of electronic excitations. The oscillation amplitude is comparable to the flux values for short pulses with the duration γ_l ^-1 ≤ ℏ/ΔE. A damped echo of the exciting pulse appears in the time intervals 2π ℏ/ΔE for very short light pulses γ_l^-1 << ℏ/ΔE. Symmetric and asymmetric pulses with a sharp front are considered. Our theory is applicable to narrow QW's in a quantizing magnetic field when the equidistant energy levels correspond to the electron-hole pairs with different Landau quantum numbers.

Keywords : Quantum wells; light absorption and transmission.

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