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Abstract
This study looks at the three-level optical Stark effect of excitons in GaAs cylindrical quantum wires, utilizing the renormalized wave function theory. By applying the three-level model consisting of the first two electron levels connected via a powerful pump laser and the first hole level, we observe the appearance of the excitonic optical Stark effect through the appearance of two separated peaks in the exciton absorption spectra. In addition, the strong impact of the pump laser detuning and the wire radius on the optical Stark effect are also put under thorough examination. Finally, a brief guidance for experimental verification is also suggested.
Highlights
Low-dimensional semiconductor structures, which are the core of many semiconductor devices, have been studied for new applied fields thanks to the inventions of advanced technologies [1,2,3,4,5,6,7,8,9,10,11,12]
The band offset between GaAs and Al0.7Ga0.3As is finite, but here, in our very first work related to quantum wires, we assume quantum wires being surrounded by an infinite potential for the sake of simplicity
We have studied the three-level excitonic optical Stark effect in GaAs circular cylindrical quantum wires by means of the renormalized wave function theory
Summary
Low-dimensional semiconductor structures, which are the core of many semiconductor devices, have been studied for new applied fields thanks to the inventions of advanced technologies [1,2,3,4,5,6,7,8,9,10,11,12]. In low-dimensional semiconductor systems, scientists have observed the excitonic optical Stark effect when irradiating a strong pump laser pulse in [30, 31] This effect resulted from the interaction between exciton states, displayed through splitting and shifting the absorption spectrum of the exciton [32,33,34,35]. The second type is due to a coupling of two exciton-excited states under the effect of a pump laser beam of lower intensity, known as a three-level Stark effect [38, 39] The latter has more applicability because it is more likely to occur.
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