scholarly journals Effect of Electric Field on Energy Spectrum and Intersubband Absorption Coefficient of Electron in Spherical Multilayered Quantum dot CdSe/ZnS/CdSe

2017 ◽  
Vol 18 (3) ◽  
pp. 297-301
Author(s):  
V.A. Holovatsky ◽  
M.Y. Yakhnevych
Keyword(s):  
Energy Spectrum ◽  
Quantum Dot ◽  
Electric Field ◽  
Absorption Coefficient ◽  
Electron Energy Spectrum ◽  
Wave Functions ◽  
Core Electron ◽  
Mass Approximation ◽  
The Matrix ◽  
Quantum Transitions

In this paper, the energy spectrum of electron and complete set of exact wave functions are obtained in the framework of effective mass approximation and rectangular potential barriers model for the CdSe/ZnS/CdSe nanostructure. Using the matrix method, the numeric calculations are performed for the electron energy spectrum as a function of electric field strength in multilayered quantum dot. It is shown that the electric field effects on the core electron in the ground state and causes its tunneling into the outer potential well. Thus, the overlap of wave functions varies essentially, influencing the dipole momentum of quantum transitions and light absorption coefficient.

scholarly journals Effect of Magnetic Field on Energy Spectrum and localizationof electron in multilayeredspherical nanosystems

2016 ◽  
Vol 17 (2) ◽  
pp. 180-187
Author(s):  
V. Holovatsky ◽  
I. Bernik ◽  
M. Yahnevych
Keyword(s):  
Magnetic Field ◽  
Energy Spectrum ◽  
Potential Barrier ◽  
Electron Energy Spectrum ◽  
Wave Functions ◽  
Quasi Particle ◽  
Potential Barriers ◽  
Mass Approximation ◽  
Probability Densities ◽  
The Magnetic Field

The effect of magnetic field on electron energy spectrum, wave functions and probability densities in multilayered spherical quantum-dot-quantum-well (QDQW) CdSe/ZnS/CdSe/ZnS is studied in order to clear the question if the quasi-particle can tunnel through potential barrier under the influence of the external field. Computations are performed in the framework of the effective mass approximation and rectangular potential barriers model. It is used the method of the wave functions expansion over the complete basis of functions obtained as an exact solutions of the Schrodinger equation for the electron in QDQW without the magnetic field. It is shown that magnetic field takes off the spectrum degeneration with respect to the magnetic quantum number and deforms electron wave functions. The field stronger effects on the spherically-symmetric states, especially if the electron is localized in outer potential well. It is theoretically confirmed that under the influence of magnetic field the quasi-particle can essentially change its location tunneling through nanoscale potential barrier. That phenomenon would appear in optical properties of nanostructure.

Dirac particle in electric field with confining scalar potential on (anti)-de Sitter background

2018 ◽  
Vol 33 (34) ◽  
pp. 1850202 ◽  
Author(s):  
N. Messai ◽  
B. Hamil ◽  
A. Hafdallah
Keyword(s):  
Energy Spectrum ◽  
Dirac Equation ◽  
Electric Field ◽  
Scalar Potential ◽  
Dirac Particle ◽  
Wave Functions ◽  
De Sitter ◽  
Sitter Background ◽  
Position Representation

In this paper, we study the (1 + 1)-dimensional Dirac equation in the presence of electric field and scalar linear potentials on (anti)-de Sitter background. Using the position representation, the energy spectrum and the corresponding wave functions are exactly obtained.

Investigation of the Electron Energy Spectrum in a Three Dimensional Regimented Tetragonal Quantum Dot Superlattice

2001 ◽  
Vol 677 ◽  
Author(s):  
Olga L. Lazarenkova ◽  
Alexander A. Balandin
Keyword(s):  
Quantum Dots ◽  
Energy Spectrum ◽  
Quantum Dot ◽  
Electron Energy ◽  
Electronic Band Structure ◽  
Three Dimensional ◽  
Electron Energy Spectrum ◽  
Real Crystal ◽  
Electronic Band ◽  
Gaas Quantum Dot

ABSTRACTWe analyze the electron energy spectrum in three-dimensional regimented arrays of semiconductor quantum dots. The coupling among quantum dots results in formation of three- dimensional electron mini-bands. Changing the size of quantum dots, inter-dot distance, barrier height and regimentation, one can control the electronic band structure of this quantum dot superlattice, which can also be referred to as quantum dot crystal due to its structure and energy spectrum that resemble those of a real crystal. Results of computer simulations carried out for a tetragonal InAs/GaAs quantum dot superlattice show that the electron density of states, effective mass tensor and other properties are different from those of bulk and conventional quantum well superlattices.

Binding Energy of Donor Impurity in a Rectangular Semiconductor GaAs Quantum Dot with Electric Field

2014 ◽  
Vol 687-691 ◽  
pp. 3407-3410
Author(s):  
Kang Yun ◽  
Sheng Wang ◽  
Xian Li Li
Keyword(s):  
Binding Energy ◽  
Quantum Dot ◽  
Electric Field ◽  
Potential Model ◽  
Binding Energies ◽  
Zero Field ◽  
Donor Impurity ◽  
One Dimensional ◽  
Mass Approximation ◽  
Gaas Quantum Dot

Within the quasi-one-dimensional effective potential model and effective mass approximation, we calculate the ground and the first few excited state binding energies of a donor impurity in a rectangular quantum dot (RQD) in the presence of electric field. We discuss detailedly dependence of the binding energies on the impurity positions. The results show that the binding energy is the largest when the impurity is located at the center of RQD with zero field and is lowest when the impurity is located at the corner of the RQD. The peak strengths and positions of the probability density in RQD appear to be the critical control on such impurity-induced dependence. We believe our results can provide an indication for design of some photoelectric devices constructed based on GaAs RQD structures.

scholarly journals MATLAB Wavelet analysis of electron energy spectrum in one-dimensional quantum well with infinitely high walls for Al-Ga-As system (0 < x < 1)

2021 ◽  
Vol 2056 (1) ◽  
pp. 012025
Author(s):  
E R Kozhanova ◽  
I M Tkachenko ◽  
V V Belyaev ◽  
S Maignan
Keyword(s):  
Energy Spectrum ◽  
Quantum Well ◽  
Energy Levels ◽  
Electronic States ◽  
Semiconductor Nanostructures ◽  
Electron Energy Spectrum ◽  
Wave Functions ◽  
Quantum Energy ◽  
One Dimensional ◽  
Analysis Of Results

Abstract This paper presents calculations of electronic states in AlxGa1-x As semiconductor nanostructures and simulates the envelope wave functions of quantum energy levels in a one-dimensional quantum well with infinitely high walls of a given width at various values of x. For the analysis of results the authors choose the function wtmm from the Matlab library that fixes the extremums and which is a characteristic of the fractality of the envelope wave functions of quantum energy levels.

scholarly journals Optical Absorption of a D2+ Artificial Molecule Confined in a Spherical Quantum Dot

2022 ◽  
Author(s):  
Emre Bahadir Al ◽  
Huseyin Sari ◽  
Serpil Sakiroglu ◽  
İsmail Sokmen
Keyword(s):  
Energy Spectrum ◽  
Binding Energy ◽  
Optical Absorption ◽  
Quantum Dot ◽  
Internuclear Distance ◽  
Energy Difference ◽  
Spherical Quantum Dot ◽  
Mass Approximation ◽  
Diagonalization Method ◽  
Energy Equilibrium

Abstract In this work, we have performed a theoretically study on the energy spectrum, binding energy and intersubband optical absorption of a D2+ complex confined in a spherical quantum dot with finite confinement potential by using diagonalization method within the effective mass approximation. We analyzed the effect of the quantum dot size and internuclear distance on the binding energy, equilibrium distance and optical response of the singly ionized double donor complex. Theoretical analysis of the D2+ system indicated that the internuclear distance significantly affects the energy difference between the two lowest-lying electron states and amplitude of the optical absorption. In general, we conclude that the internuclear distance and quantum dot size dependence of the low-lying energy spectrum of the D2+ complex in a quantum dot favors the describing of an appropriate two-level system needed for quantum computation.

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