BINDING ENERGIES OF A NEGATIVE TRION IN A QUANTUM DOT

2008 ◽  
Vol 22 (24) ◽  
pp. 2421-2428
Author(s):  
WENFANG XIE
Keyword(s):  
Quantum Dot ◽  
Exact Diagonalization ◽  
Binding Energies ◽  
Triplet States ◽  
Mass Ratio ◽  
Electron Hole ◽  
Spin Singlet ◽  
Diagonalization Method ◽  
Singlet And Triplet States ◽  
Exact Diagonalization Method

The binding energies of a negative trion confined in a quantum dot are calculated using the exact diagonalization method. Both the spin singlet and triplet states are considered. Our results show that the binding energies are sensitive to the strength of the confinement potential as well as the electron–hole mass ratio.

The trion spin-singlet and -triplet states in ZnSe single quantum wells

2000 ◽  
Vol 214-215 ◽  
pp. 832-836 ◽  
Author(s):  
O Homburg ◽  
P Michler ◽  
K Sebald ◽  
J Gutowski ◽  
H Wenisch ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Triplet States ◽  
Single Quantum ◽  
Spin Singlet ◽  
Singlet And Triplet States

The magnetization and magnetic susceptibility of GaAs Gaussian quantum dot with donor impurity in a magnetic field

2019 ◽  
Vol 33 (34) ◽  
pp. 1950422 ◽  
Author(s):  
Mohammad Elsaid ◽  
Mohamoud Ali ◽  
Ayham Shaer
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Quantum Dot ◽  
Theoretical Study ◽  
Donor Impurity ◽  
Confinement Potential ◽  
Potential Depth ◽  
Diagonalization Method ◽  
Electron Quantum ◽  
Exact Diagonalization Method

We present a theoretical study to investigate the effect of donor impurity on the magnetization (M) and the magnetic susceptibility [Formula: see text] of single electron quantum dot (QD) with Gaussian confinement in the presence of a magnetic field. We solve the Hamiltonian of this system, including the spin, by using the exact diagonalization method. The ground state binding energy (BE) of an electron has been shown as a function of QD radius and confinement potential depth. The behaviors of the magnetization and the magnetic susceptibility of a QD have been studied as a function of temperature, confinement potential depth, quantum radius and magnetic field. We have shown the effect of donor impurity on the magnetization and magnetic susceptibility curves of Gaussian quantum dot (GQD).

scholarly journals Detection of spin polarization utilizing singlet and triplet states in a single-lead quantum dot

2012 ◽  
Vol 86 (8) ◽  
Author(s):  
Tomohiro Otsuka ◽  
Yuuki Sugihara ◽  
Jun Yoneda ◽  
Shingo Katsumoto ◽  
Seigo Tarucha
Keyword(s):  
Quantum Dot ◽  
Spin Polarization ◽  
Triplet States ◽  
Singlet And Triplet States

THE MASS OF H-DIBARYON IN AN SU(3) SKYRME MODEL

1990 ◽  
Vol 05 (11) ◽  
pp. 887-890 ◽  
Author(s):  
HYUN KYU LEE ◽  
JOON HA KIM
Keyword(s):  
Exact Diagonalization ◽  
Skyrme Model ◽  
Baryon Spectrum ◽  
H Dibaryon ◽  
Diagonalization Method ◽  
Exact Diagonalization Method ◽  
Best Fit

The mass of H-dibaryon is estimated in an SU(3) Skyrme model using the exact diagonalization method. With the parameters determined from the best fit to the B = 1 baryon spectrum, the mass of H-dibaryon is obtained as 1818 MeV.

scholarly journals Organic Molecules with Inverted Gaps between First Excited Singlet and Triplet States and Appreciable Fluorescence Rates

2020 ◽  
Author(s):  
Robert Pollice ◽  
Pascal Friederich ◽  
Cyrille Lavigne ◽  
Gabriel dos Passos Gomes ◽  
Alan Aspuru-Guzik
Keyword(s):  
Excited State ◽  
Energy Difference ◽  
Delayed Fluorescence ◽  
Triplet States ◽  
Electron Hole ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Singlet And Triplet States

One of the recent proposals for the design of state-of-the-art emissive materials for organic light emitting diodes (OLEDs) is the principle of thermally activated delayed fluorescence (TADF). The underlying idea is to enable facile thermal upconversion of excited state triplets, which are generated upon electron-hole recombination, to excited state singlets by minimizing the corresponding energy difference resulting in devices with up to 100% internal quantum efficiencies (IQEs). Ideal emissive materials potentially surpassing TADF emitters should have both negative singlet-triplet gaps and appreciable fluorescence rates to maximize reverse intersystem crossing (rISC) rates from excited triplets to singlets while minimizing ISC rates and triplet state occupation leading to long-term operational stability. However, molecules with negative singlet-triplet gaps are extremely rare and, to the best of our knowledge, not emissive. In this work, based on computational studies, we describe the first molecules with negative singlet-triplet gaps and considerable fluorescence rates and show that they are more common than hypothesized previously.

scholarly journals The Effects of Pressure and Temperature on the Magnetic Susceptibility of Semiconductor Quantum Dot in A Magnetic Field

2017 ◽  
Vol 9 (1) ◽  
pp. 77 ◽  
Author(s):  
Faten BZOUR ◽  
Mohammad K. ELSAID ◽  
Ayham SHAER
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Quantum Dot ◽  
Theoretical Study ◽  
External Pressure ◽  
Diagonalization Method ◽  
Electron Quantum ◽  
Exact Diagonalization Method ◽  
Good Agreement ◽  
Parabolic Quantum Dot

In this work, we present a theoretical study of the magnetic susceptibility (x of two-electron GaAs parabolic quantum dot (QD) under the combined effects of external pressure, temperature and magnetic field. We used the exact diagonalization method to obtain the eigenenergies by solving the two electron quantum dot Hamiltonian taking into account the dependence of the effective mass and dielectric constant on the hydrostatic pressure and temperature. The pressure and temperature show significant effects on the calculated QD spectra. Next, we investigate the behavior of the magnetization of a quantum dot as a function of external pressure, temperature, confining frequency and magnetic field. The singlet-triplet transitions in the ground state of the quantum dot spectra and the corresponding jumps in the magnetic susceptibility spectra have been shown. The comparison shows that our results are in very good agreement with the reported works.

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