Abstract
We have studied the influence of a terahertz (THz) electric field and a magnetic field on theoptical absorption in quantum wells. The studies show that the absorption spectrumbecomes much richer in the presence of a THz field and a magnetic field. In agrowth-direction polarized THz field, the main features of the quantum-confined Starkeffect, such as the red-shift of the absorption edge, the reduction in the magnitude of themain excitonic peaks, and the appearance of additional absorption peaks due to transitionswhich are forbidden in the absence of a DC field, are retained. In addition, new asymmetricreplicas emerge around these peaks. The perpendicular magnetic field leads to quantizationof the in-plane motion, and thus enhances the main excitonic peaks and shifts thepeaks to the blue, and discretizes the continuum of the absorption spectrum. Themagnetic field may leads to the merging or broadening of peaks and replicas.
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