scholarly journals Comparative study of the exciton binding energies of thin and ultrathin organic-inorganic perovskites due to dielectric mismatch effects

2017 ◽  
Vol 122 (1) ◽  
pp. 015701 ◽  
Author(s):  
Haitham Zahra ◽  
Aïda Hichri ◽  
Sihem Jaziri
Keyword(s):  
Comparative Study ◽  
Binding Energies ◽  
Dielectric Mismatch

scholarly journals A Comparative Study of Oxygen and Hydrogen Adsorption on Strained and Alloy-Supported Pt(111) Monolayers

2021 ◽  
Vol 7 (7) ◽  
pp. 101
Author(s):  
Ian Shuttleworth
Keyword(s):  
Comparative Study ◽  
Density Functional ◽  
Hydrogen Adsorption ◽  
Binding Energies ◽  
High Symmetry ◽  
Density Functionals ◽  
Functional Theory ◽  
Ligand Effects ◽  
Ferromagnetic Alloys ◽  
Depth Study

A comparative study of the unreacted and reacted uniaxially strained Pt(111) and the layered (111)-Pt/Ni/Pt3Ni and (111)-Pt/Ni/PtNi3 surfaces has been performed using density functional theory (DFT). An in-depth study of the unreacted surfaces has been performed to evaluate the importance of geometric, magnetic and ligand effects in determining the reactivity of these different Pt surfaces. An analysis of the binding energies of oxygen and hydrogen over the high-symmetry binding positions of all surfaces has been performed. The study has shown that O and H tend to bind more strongly to the (111)-Pt/Ni/Pt3Ni surface and less strongly to the (111)-Pt/Ni/PtNi3 surface compared to binding on the equivalently strained Pt(111) surfaces. Changes in the surface magnetisation of the surfaces overlaying the ferromagnetic alloys during adsorption are discussed, as well as the behaviour of the d-band centre across all surfaces, to evaluate the potential mechanisms for these differences in binding. An accompanying comparison of the accessible density functionals has been included to estimate the error in the computational binding energies.

Effects of dielectric mismatch on the impurity binding energies in GaAs-Ga1−xAlxAs quantum wells

1994 ◽  
Vol 50 (8) ◽  
pp. 5732-5735 ◽  
Author(s):  
Zhen-Yan Deng ◽  
Ting-Rong Lai ◽  
Jing-Kun Guo
Keyword(s):  
Quantum Wells ◽  
Binding Energies ◽  
Dielectric Mismatch

Magnetic field induced trions in a Telluride-based II–VI material

2016 ◽  
Vol 30 (11) ◽  
pp. 1650069
Author(s):  
P. Sujanah ◽  
A. John Peter ◽  
Chang Woo Lee
Keyword(s):  
Magnetic Field ◽  
Optical Transition ◽  
Binding Energies ◽  
Raman Shift ◽  
Raman Resonance ◽  
The Poisson Equation ◽  
Hartree Potential ◽  
Consistent Method ◽  
The Magnetic Field ◽  
Dielectric Mismatch

Effects of geometrical confinement and magnetic field strength on the binding energies of trions (positive trion and negative trion) in a CdTe/ZnTe parabolic dot are investigated. Coulomb interaction energy is obtained by employing Hartree potential and the results are found numerically. The modified Chandrasekhar wavefunctions are employed to obtain the respective energies. The confined energies and the respective binding energies of charged trions are investigated by the self-consistent method. The Poisson equation is used to find the electron and hole potentials. The dielectric mismatch is included throughout the calculations. Magneto-optical transition energies for charged trions in the presence of magnetic field are observed. The effective Landé factor is brought out. Raman shift and the Raman intensity of positive and negative trions for various magnetic field strengths in the CdTe/ZnTe nanostructures are investigated. The dependence of Raman resonance on the magnetic field and the geometrical confinement effect is brought out.

Sign in / Sign up

Export Citation Format

Share Document