Influence of conduction-band non-parabolicity on terahertz intersubband Raman gain in GaAs/InGaAs step asymmetric quantum wells

Tiutiunnyk, A.; Perez-Quintana, I.; Laroze, David; Duque, C.A.

doi:10.1007/s00339-019-3214-4

Cited by 6 publications

(1 citation statement)

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“…Many studies have shown that nanoparticle size can be controlled by varying the laser photon energy (wavelength), where the particle size decreases as the number of irradiations of laser pulses increases [27][28][29][30]. Moreover, the intense laser (ILF) and electric fields (EF) induce repulsive effects that counteract the attractive Coulomb interaction between the correlated pair, reducing the overall E b , and therefore affecting the physical properties of these nanomaterials [31][32][33][34][35][36][37][38][39]. The influence of these two applied fields on some nanostructures has been widely investigated in the literature [40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Intense Laser Field Effect on the Photo-Ionization Cross-Section of the First Exciton Transition in a Core/Shell Quantum Dot Submitted to an Applied Electric Field

et al. 2023

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In the current work, we study the intense laser pulse influences on the behaviors of the first excitonic transition in a core/shell quantum dot submitted to an electric field. Therefore, the exciton binding energy and the mean distance between the correlated electron–hole pair are discussed, considering the electric field and laser strength. Our calculations show that both external fields play significant repulsive effects. Through their effects, they oppose the attractive nature of the Coulomb potential between the correlated pair, which decreases the excitonic binding energy. We also analyze the dissociation process by determining the photo-ionization cross-section (PICS). Our findings show that the peaks of the PICS redshift when the shell thickness b−a increases. For a given core radius, the laser and electric field induce a shift toward the low-energy region for the PICS; this displacement is more pronounced for the laser case. Our study also compares simple quantum dots and core/shell quantum dots to show the effect of the inner radius on the obtained results. Our theoretical results can lead to promising applications of exciton-based devices controlled by sizes and external fields.

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