In this paper, the effect of relative phase of applied fields on probe field dispersion and absorption for a ladder-shaped three level quantum dot molecule is investigated. The results show that the relative phase of applied fields can be affected on the probe beam propagation, and thus its absorption, dispersion and group velocity. The dispersion and the absorption may change with the relative phase of applied fields. By adjusting relative phase of applied fields light propagation from superluminal to subluminal and absorption to gain can be switched.

Keywords: Relative phase of applied fields, Superluminal, Subluminal, Quantum dot

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