Quantum Dots as Sources and Detectors οf Mid- and Far-Infrared Radiation: Theoretical Models

Vukmirović, Nenad; Indjin, D.; Ikonić, Z.; Harrison, P.

doi:10.12693/aphyspola.116.464

Cited by 10 publications

(3 citation statements)

References 35 publications

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“…In the recent years semiconductor nanostructures such as Quantum Dots (QDs) have attracted much attention due to the novel physical properties and potential for device applications in far infrared laser amplifiers (Kukushkin 2009), photo detectors (Krishna 2005;Vukmirovic et al 2009), high speed electro-optical modulators (Majumdar et al 2010), quantum computing (Loss and Divincenzo 1998), and etc. Three dimensional nanoscale confinement of electrons in this structures, makes it possible to observe quantum size effects on the electronic and optical properties of these structures (Ahn and Cuang 1987;Zhang et al 2006;Liu and Xu 2008;Rezaei et al 2008;Karabulut et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous effects of spin-orbit interaction and external electric field on the linear and nonlinear optical properties of a cubic quantum dot

2011

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In this article simultaneous effects of external electric field and spin-orbit interaction on the linear and the nonlinear optical properties of a cubic quantum dot are studied. Based on the non-degenerate perturbation method, energy eigenvalues and eigenfunctions of the system under the influence of spin-orbit interaction are calculated. Furthermore, the linear and the nonlinear optical absorption coefficients and refractive index changes are obtained using the compact density matrix approach and iterative method. Our results show that, due to the spin-orbit interaction, resonant peak values of the optical absorption coefficients and refractive index changes decrease and occur at lower values of the incident photon energy. The variation of these optical parameters depend on the spin-orbit interaction strength, dot dimensions and external electric field.

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Section: Introductionmentioning

confidence: 99%

Simultaneous effects of spin-orbit interaction and external electric field on the linear and nonlinear optical properties of a cubic quantum dot

2011

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“…As a result, the cm motion has the same energy eigenvalues as a single electron. This is very important for far-infrared (FIR) spectroscopy experiments [87][88][89][90] where, typically, the interaction of confined electrons with an electromagnetic field, E e i ωt can be described by a Hamiltonian of the form…”

Section: Kohn's Generalized Theoremmentioning

confidence: 99%

Understanding electronic systems in semiconductor quantum dots

Ciftja

2013

Phys. Scr.

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Systems of confined electrons are found everywhere in nature in the form of atoms where the orbiting electrons are confined by the Coulomb attraction of the nucleus. Advancement of nanotechnology has, however, provided us with an alternative way to confine electrons by using artificial confining potentials. A typical structure of this nature is the quantum dot, a nanoscale system which consists of few confined electrons. There are many types of quantum dots ranging from self-assembled to miniaturized semiconductor quantum dots. In this work we are interested in electrostatically confined semiconductor quantum dot systems where the electrostatic confining potential that traps the electrons is generated by external electrodes, doping, strain or other factors. A large number of semiconductor quantum dots of this type are fabricated by applying lithographically patterned gate electrodes or by etching on two-dimensional electron gases in semiconductor heterostructures. Because of this, the whole structure can be treated as a confined two-dimensional electron system. Quantum confinement profoundly affects the way in which electrons interact with each other, and external parameters such as a magnetic field. Since a magnetic field affects both the orbital and the spin motion of the electrons, the interplay between quantum confinement, electron–electron correlation effects and the magnetic field gives rise to very interesting physical phenomena. Thus, confined systems of electrons in a semiconductor quantum dot represent a unique opportunity to study fundamental quantum theories in a controllable atomic-like setup. In this work, we describe some common theoretical models which are used to study confined systems of electrons in a two-dimensional semiconductor quantum dot. The main emphasis of the work is to draw attention to important physical phenomena that arise in confined two-dimensional electron systems under various quantum regimes.

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“…There has been a tremendous improvement in research activities on the low dimensional semiconductor quantum dots due to the advanced fabrication techniques invented for the past few decades. The study of semiconductor quantum dots and nanocrystals has been of a great interest from the experimental and theoretical point of view in recent years [1][2][3][4][5][6][7][8][9][10][11][12][13]. The origin of the interest lies in the size of quantization.…”

Section: Introductionmentioning

confidence: 99%

Finite difference calculation of optical properties of hydrogenic impurity in spherical quantum dot with parabolic confinement

Batra

Prasad

2018

Rev. Mex. Fis. E

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The optical properties of an electron with an impurity in a spherical quantum dot under parabolic confinement are studied and energies, wave functions, binding energies, radial matrix elements, polarizability, susceptibility and oscillator strength have been evaluated. The numerical method used is the finite difference method in the framework of the effective mass approximation. The variation of the energy levels and radial matrix elements have been studied as function of the radius of the GaAs sphere and also as function of the frequency of the harmonic oscillator potential or parabolic potential. In addition we have studied how polarizability, susceptibility and the oscillator strength vary as a function of dot radius and at different parabolic potential frequencies.

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Quantum Dots as Sources and Detectors οf Mid- and Far-Infrared Radiation: Theoretical Models

Abstract: We present a review of theoretical methods used to study the electronic structure, optical and transport properties of intraband optoelectronic devices based on self-assembled quantum dots.

Cited by 10 publications

References 35 publications

Simultaneous effects of spin-orbit interaction and external electric field on the linear and nonlinear optical properties of a cubic quantum dot

Simultaneous effects of spin-orbit interaction and external electric field on the linear and nonlinear optical properties of a cubic quantum dot

Understanding electronic systems in semiconductor quantum dots

Finite difference calculation of optical properties of hydrogenic impurity in spherical quantum dot with parabolic confinement

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