Investigation of exciton ground state in quantum dots via Hamiltonian diagonalization method

2008 ◽  
Vol 76 (3) ◽  
pp. 241-249 ◽  
Author(s):  
Zachary M. Schultz ◽  
John M. Essick
Keyword(s):  
Quantum Dots ◽  
Ground State ◽  
Exciton Ground State ◽  
Diagonalization Method

scholarly journals Спиновая динамика отрицательно заряженных экситонов в квантовых точках InP/(In,Ga)P в магнитном поле

2020 ◽  
Vol 62 (11) ◽  
pp. 1816
Author(s):  
С.В. Некрасов ◽  
Ю.Г. Кусраев ◽  
И.А. Акимов ◽  
L. Langer ◽  
M. Kotur ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Circular Polarization ◽  
Ground State ◽  
Heavy Hole ◽  
Spin Dynamics ◽  
Nuclear Spins ◽  
Time Resolved ◽  
Exciton Ground State ◽  
Charged Exciton

The dynamics of the photoluminescence negative circular polarization of the InP/(In,Ga)P quantum dots ensemble was studied. We find that in the time-resolved dependences of the polarization there are no oscillations in Voigt magnetic field. Also, with increasing field the polarization declines to zero. Such behavior is attributed to the peculiarities of the negatively charged exciton spin dynamics, particularly, to the fact that in the negatively charged exciton ground state the spin dynamics is governed by the heavy hole. We show that magnetic field depolarization of the photoluminescence occurs once the field of dynamically polarized nuclear spins acting on electron spins is surpassed.

FOUR-ELECTRON SYSTEMS CONFINED IN MULTILAYER QUANTUM DOTS

2007 ◽  
Vol 21 (21) ◽  
pp. 1399-1413 ◽  
Author(s):  
WENFANG XIE
Keyword(s):  
Quantum Dots ◽  
Angular Momentum ◽  
Ground State ◽  
Electronic Structures ◽  
Electron Interaction ◽  
Magic Numbers ◽  
Electron Systems ◽  
Diagonalization Method ◽  
Exact Diagonalization Method ◽  
Ground State Electron

In this paper, we studied four-electron systems confined in one-, two-, and four-layer quantum dots, by the exact diagonalization method. A vertical magnetic field to the confinement plane is considered. The ground-state electronic structures and the spin and angular momentum transitions for different magnetic fields are investigated. Series of magic numbers of angular momentum which minimize the ground-state electron–electron interaction energy have been discovered. These are connected to the exchange and rotational symmetries of the systems.

The electronic states and magnetization of coupled AlGaAs/GaAs quantum dots in magnetic fields

2018 ◽  
Vol 32 (02) ◽  
pp. 1850011 ◽  
Author(s):  
Eshtiaq Hijaz ◽  
Mohammad K. Elsaid
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Ground State ◽  
Theoretical Study ◽  
Electronic States ◽  
Exact Diagonalization ◽  
Interacting Electrons ◽  
Diagonalization Method ◽  
Exact Diagonalization Method ◽  
Good Agreement

We present a theoretical study of electronic states and magnetization of two interacting electrons confined in coupled quantum dots (CQDs) presented in a magnetic field. We obtain the eigenenergies of the CQD by solving the relative two-dimensional (2D) Hamiltonian using the combined variational–exact diagonalization method. The dependence of magnetization on temperature, magnetic field strength, confining frequency and barrier height has been investigated. We have shown the singlet–triplet transitions in the ground state of the CQD spectra and the corresponding jumps in the magnetization curves. The comparisons show that our results are in very good agreement with the reported works.

Ground-state switching characteristics in vertically-coupled InGaN/GaN quantum dots

2013 ◽  
Vol 63 (11) ◽  
pp. 2269-2272 ◽  
Author(s):  
Seoung-Hwan Park ◽  
Woo-Pyo Hong ◽  
Jong-Jae Kim
Keyword(s):  
Quantum Dots ◽  
Ground State ◽  
State Switching ◽  
Switching Characteristics

scholarly journals Padé approximants for the ground-state energy of closed-shell quantum dots

1997 ◽  
Vol 56 (24) ◽  
pp. 15740-15743 ◽  
Author(s):  
Augusto Gonzalez ◽  
Bart Partoens ◽  
François M. Peeters
Keyword(s):  
Quantum Dots ◽  
Ground State Energy ◽  
Ground State ◽  
State Energy ◽  
Closed Shell ◽  
Padé Approximants ◽  
Pade Approximants
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