Computation of intersubband transition energy in normal and inverted core–shell quantum dots using finite difference technique

Deyasi, Arpan; Bhattacharyya, Suvanjan; Das, N. R.

doi:10.1016/j.spmi.2013.05.026

Cited by 30 publications

(3 citation statements)

References 25 publications

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“…Calculation of these eigenstates thus becomes very essential to study the electronic and optoelectronic behavior of the nanodevices [50,51]. For determining eigenstates, BenDaniel-Duke boundary condition is incorporated in order to consider the efect of efective mass mismatch at diferent hetero-interfaces, as well as to consider the conduction band discontinuity, which leads to the quantum well potential height.…”

Section: Introductionmentioning

confidence: 99%

“…For accurate estimation of resonant tunneling, displacement of energy levels from the band-edge should be considered; hence, realistic band structure plays a very important role for diferent material parameters. This leads to the beter computation of intersubband transition energy for optical emiter/detector design [50,60]. for cubic and N × N for spherical dots are produced considering N discrete points in spatial direction.…”

Section: Introductionmentioning

confidence: 99%

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Electronic Band Structure of Quantum Cascade Laser

Deyasi¹

2017

Quantum Cascade Lasers

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Multiple quantum well structure is the subject of theoretical and experimental research over the last two decades due to the possibility of making novel electronic and optoelectronic devices. The phenomenon of resonant tunneling makes it a prime candidate for all tunneling-based quantum devices with one-dimensional coninement. THz laser design using multilayered low-dimensional semiconductor structure is one such example, where miniband formation and its energy diference with lowest quantum state play crucial factor in governing device performance. Quantum cascade laser (QCL) is one of such candidate, which speaks in favor of research using multiple-quantum-well (MQW) structure. In the proposed chapter, transmission coeicient of multiple quantum-well structure is numerically computed using propagation matrix technique, and its density of states is calculated in the presence and absence of electric ield applied along the direction of quantum coninement. Absorption coeicient is also calculated for its possible application as optical emiter/detector. Based on the electronic and photonic properties investigated, electronic band structure of the quantum cascade laser (formed using the MQW structure) is computed. Formation of miniband is tailored with variation of external bias is shown.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electronic Band Structure of Quantum Cascade Laser

Deyasi¹

2017

Quantum Cascade Lasers

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“…Most theoretical methods assume an ideal and symmetric model potential and often recur to the expansions or approximations using the analytic basis functions [26,27]. Numerical methods are feasible alternatives and the finite difference method (FDM) can be one of the most powerful techniques for solving real quantum systems being considered recently [28][29][30][31][32][33][34][35][36][37][38][39]. This paper reports the capability of 2D FDM by examining double QDs (DQDs) and triple QDs (TQDs) with a model potential composed of truncated parabolic potential wells.…”

Section: Introductionmentioning

confidence: 99%

Finite difference method for the arbitrary potential in two dimensions: Application to double/triple quantum dots

Ahn

2014

Superlattices and Microstructures

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A finite difference method (FDM) applicable to a two dimensional (2D) quantum dot was developed as a nonconventional approach to the theoretical understandings of quantum devices. This method can be applied to a realistic potential with an arbitrary shape. Using this method, the Hamiltonian in a tri-diagonal matrix could be obtained from any 2D potential, and the Hamiltonian could be diagonalized numerically for the eigenvalues. The legitimacy of this method was first checked by comparing the results with a finite round well with the analytic solutions. Two truncated harmonic wells were examined as a realistic model potential for lateral double quantum dots (DQDs) and for triple quantum dots (TQDs). The successful applications of the 2D FDM were observed with the entanglements in the DQDs. The level-splitting and anticrossing behaviors of the DQDs could be obtained by varying the distance between the dots and by introducing asymmetry in the well-depths. The 2D FDM results for linear/triangular TQDs were compared with the tight binding approximations.

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Oscillator Strength of Gaussian Double Quantum Well for Intersubband Transition

Sarkar¹,

Deyasi²

2017

Springer Proceedings in Physics

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Computation of intersubband transition energy in normal and inverted core–shell quantum dots using finite difference technique

Cited by 30 publications

References 25 publications

Electronic Band Structure of Quantum Cascade Laser

Electronic Band Structure of Quantum Cascade Laser

Finite difference method for the arbitrary potential in two dimensions: Application to double/triple quantum dots

Oscillator Strength of Gaussian Double Quantum Well for Intersubband Transition

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