Thermal induced carrier’s transfer in bimodal size distribution InAs/GaAs quantum dots

Ilahi, Bouraoui; Alshehri, Khairiah; Madhar, Niyaz Ahmad; Sfaxi, L.; Maâref, H.

doi:10.1016/j.rinp.2018.04.002

Cited by 3 publications

(3 citation statements)

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“…Note that the Fermi energy ǫ F is dependent on the charge density (n 1D ) and the confining potential ( ω o ). Thus, our goal is to investigate the single-particle and collective excitations in a quantum wire comprised of the VSQD in a two-subband model within the full RPA [76] at absolute zero (T=0 K).…”

Section: Illustrative Examples On the Magnetoplasmonsmentioning

confidence: 99%

“…The foreseen device potential of the VSQD system immediately prompted many research groups embarking on the wide-ranging investigations. Consequently, diverse experimental and theoretical [57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76] works started dealing with electronic, optical, and transport phenomena, which persuaded authors to envision diverse solid-state devices. The early focus remained primarily on the quantum-dot molecules (QDM) made up of the pairs of VSQD separated by thin barriers.…”

Section: Introductionmentioning

confidence: 99%

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Single-particle and collective excitations in quantum wires comprised of vertically stacked quantum dots: Finite magnetic field

Kushwaha

2021

Preprint

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A theoretical investigation has been made of the magnetoplasmon excitations in a quasi-one-dimensional electron system comprised of vertically stacked, self-assembled InAs/GaAs quantum dots. The smaller length scales involved in the experiments impel us to consider a perfectly periodic system of two-dimensionally confined InAs quantum dot layers separated by GaAs spacers. Subsequent system is subjected to a twodimensional confining (harmonic) potential in the x-y plane and an applied magnetic field (B) in the symmetric gauge. This scheme defines virtually a system of quantum wire comprised of vertically stacked quantum dots (VSQD). We derive and discuss the Dyson equation, the generalized (nonlocal and dynamic) dielectric function, and the inverse dielectric function for investigating the single-particle and collective (magnetoplasmon) excitations within the framework of (full) random-phase approximation (RPA). As an application, we study the influence of the confinement potential and the magnetic field on the component eigenfunctions, the density of states (DOS), the Fermi energy, the collective excitations, and the inverse dielectric functions.How the B-dependence of DOS validate the VSQD mimicking the realistic quantum wires, the Fermi energy oscillates as a function of the Bloch vector, the intersubband single-particle continuum bifurcates at the origin, a collective excitation emerges and propagates within the gap of the split single-particle continuum, and the alteration in the well-and barrier-widths allows to customize the excitation spectrum in the desired energy range are some of the remarkable features of this investigation. These findings demonstrate, for the very first time, the significance of investigating the system of VSQD subjected to a quantizing magnetic field.Given the edge over the planar quantum dots and the foreseen applications in the single-electron devices and quantum computation, investigating the system of VSQD is deemed vital. The results suggest exploiting magnetoplasmon qubits to be a potential option for implementing the solemn idea of quantum state transfer in devising quantum gates for the quantum computation and quantum communication networks.

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Section: Illustrative Examples On the Magnetoplasmonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-particle and collective excitations in quantum wires comprised of vertically stacked quantum dots: Finite magnetic field

Kushwaha

2021

Preprint

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“…Immediately upon being noticed due to the device potential, this discovery ignited an explosion in investigation into the physics of quantum dots and a large number of groups became active embarking on a variety of research interests. The result was a long list of experimental [29][30][31][32][33][34][35][36][37][38] and theoretical [39][40][41][42][43][44][45][46][47][48] works dealing with elastic, thermal, electrical, magnetic, electronic, and optical phenomena, which motivated authors to envisage various solid-state devices. Early efforts had largely focused on the pairs of VSQD separated by thin barrierstermed quantum dot molecules (QDM) -because of their importance in realizing the short-distance quantum-state transfer, which is essential for the future quantum communication networks.…”

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confidence: 99%

The magneto-optics in quantum wires comprised of vertically stacked quantum dots: A calling for the magnetoplasmon qubits

Kushwaha¹

2019

EPL

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A deeper sense of advantages over the planar quantum dots and the foreseen applications in the single-electron devices and quantum computation have given vertically stacked quantum dots (VSQD) a width of interest. Here, we embark on the collective excitations in a quantum wire made-up of vertically stacked, self-assembled InAs/GaAs quantum dots in the presence of an applied magnetic field in the symmetric gauge. We compute and illustrate the influence of an applied magnetic field on the behavior characteristics of the density of states, Fermi energy, and collective (magnetoplasmon) excitations [obtained within the framework of random-phase approximation (RPA)]. The Fermi energy is observed to oscillate as a function of the Bloch vector. Remarkably, the intersubband single-particle continuum splits into two with a collective excitation propagating within the gap. This is attributed to the (orbital) quantum number owing to the applied magnetic field. Strikingly, the alteration in the well-and barrier-widths can enable us to customize the excitation spectrum in the desired energy range. These findings demonstrate, for the very first time, the viability and importance of studying the VSQD subjected to an applied magnetic field. The technological promise that emerges is the route to devices exploiting magnetoplasmon qubits as the potential option in designing quantum gates for the quantum communication networks. 78.20.Ls

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Single-particle and collective excitations in quantum wires comprised of vertically stacked quantum dots: Finite magnetic field

Kushwaha

2020

Mod. Phys. Lett. B

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A theoretical investigation has been made of the magnetoplasmon excitations in a quasi-one-dimensional electron system composed of vertically stacked, self-assembled InAs/GaAs quantum dots. The smaller length scales involved in the experiments impel us to consider a perfectly periodic system of two-dimensionally confined InAs quantum dot layers separated by GaAs spacers. Subsequent system is subjected to a two-dimensional confining (harmonic) potential in the [Formula: see text]–[Formula: see text] plane and an applied magnetic field (B) in the symmetric gauge. This scheme defines virtually a system of quantum wire comprised of vertically stacked quantum dots (VSQD). We derive and discuss the Dyson equation, the generalized (nonlocal and dynamic) dielectric function, and the inverse dielectric function for investigating the single-particle and collective (magnetoplasmon) excitations within the framework of (full) random-phase approximation (RPA). As an application, we study the influence of the confinement potential and the magnetic field on the component eigenfunctions, the density of states (DOS), the Fermi energy, the collective excitations, and the inverse dielectric functions. How the B-dependence of DOS validate the VSQD mimicking the realistic quantum wires, the Fermi energy oscillates as a function of the Bloch vector, the intersubband single-particle continuum bifurcates at the origin, a collective excitation emerges and propagates within the gap of the split single-particle continuum, and the alteration in the well- and barrier-widths allows to customize the excitation spectrum in the desired energy range are some of the remarkable features of this investigation. These findings demonstrate, for the very first time, the significance of investigating the system of VSQD subjected to a quantizing magnetic field. Given the edge over the planar quantum dots and the foreseen applications in the single-electron devices and quantum computation, investigating the system of VSQD is deemed vital. The results suggest exploiting magnetoplasmon qubits to be a potential option for implementing the solemn idea of quantum state transfer in devising quantum gates for the quantum computation and quantum communication networks.

show abstract

Thermal induced carrier’s transfer in bimodal size distribution InAs/GaAs quantum dots

Cited by 3 publications

References 4 publications

Single-particle and collective excitations in quantum wires comprised of vertically stacked quantum dots: Finite magnetic field

Single-particle and collective excitations in quantum wires comprised of vertically stacked quantum dots: Finite magnetic field

The magneto-optics in quantum wires comprised of vertically stacked quantum dots: A calling for the magnetoplasmon qubits

Single-particle and collective excitations in quantum wires comprised of vertically stacked quantum dots: Finite magnetic field

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