Decoherence of Magneto-Bipolaron with Strong Coupling in a Quantum Dot Qubit Under Applied Electric Field

Guimapi, D. C. Ngoufack; Mengoue, M. Silenou; Merad, A.E.; Fotué, A. J.

doi:10.1007/s10909-021-02612-9

Cited by 3 publications

(1 citation statement)

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“…On the basis of QDs, quantum lasers, LEDs of various spectra [ 14 – 16 ], biochemical sensors [ 17 , 18 ], single-electron diodes and transistors [ 19 , 20 ], and saturated TV screens with a wide range of different colors have been designed and successfully implemented. Recent studies also show that QDs are key objects for the successful implementation of qubits [ 21 – 23 ]. One of the priority tasks of modern semiconductor physics is the development of a new generation of label-free biochemical sensors based on quantum confinement and tunneling between nanostructures as well as sensors for detection of structural changes in the material.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Exciton Collapse in a Strongly Flattened Ellipsoidal InSb Quantum Dot

Dvoyan

Karoui²,

Vlahović³

2022

Nanoscale Res Lett

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Electronic and excitonic states in an InSb strongly flattened ellipsoidal quantum dot (QD) with complicated dispersion law are theoretically investigated within the framework of the geometric adiabatic approximation in the strong, intermediate, and weak quantum confinement regimes. For the lower levels of the spectrum, the square root dependence of energy on QD sizes is revealed in the case of Kane’s dispersion law. The obtained results are compared to the case of a parabolic (standard) dispersion law of charge carriers. The possibility of the accidental exciton instability is revealed for the intermediate quantum confinement regime. For the weak quantum confinement regime, the motion of the exciton's center-of-gravity is quantized, which leads to the appearance of additional Coulomb-like sub-levels. It is revealed that in the case of the Kane dispersion law, the Coulomb levels shift into the depth of the forbidden band gap, moving away from the quantum confined level, whereas in the case of the parabolic dispersion law, the opposite picture is observed. The corresponding selection rules of quantum transitions for the interband absorption of light are obtained. New selection rules of quantum transitions between levels conditioned by 2D exciton center of mass vertical motion quantization in a QD are revealed. The absorption threshold behavior characteristics depending on the QDs geometrical sizes are also revealed.

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