Density functional theory of two-dimensional electron–hole complexes

2019 ◽  
Vol 33 (12) ◽  
pp. 1950152
Author(s):  
Alexander A. Vasilchenko
Keyword(s):  
Magnetic Field ◽  
Density Functional Theory ◽  
Density Functional ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Electron Hole ◽  
Functional Theory ◽  
Exchange Correlation ◽  
The Density Functional Theory ◽  
Number Of Particles

The energy of the two-dimensional electron–hole complex has been calculated in the framework of the density functional theory. We show that the energy of a direct two-dimensional exciton, without taking into consideration the exchange–correlation interaction, is very different from the exact value. We find that the number of particles in the indirect electron–hole complexes decreases with increasing interlayer distance in a strong magnetic field.

Ground State of Quasi-Two-Dimensional Electron–Hole Liquid on Silicon Surface

2020 ◽  
Vol 19 (06) ◽  
pp. 2050008
Author(s):  
Alexander A. Vasilchenko
Keyword(s):  
Ground State ◽  
Density Functional ◽  
Binding Energies ◽  
Silicon Surfaces ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Electron Hole ◽  
Functional Theory ◽  
The Density Functional Theory

The density functional theory is used for the determination of a ground state of a quasi-two-dimensional electron[Formula: see text]hole liquid (EHL) in the presence of an external electric field. The Kohn[Formula: see text]Sham equations for electrons and holes are numerically solved. The binding energies of electron[Formula: see text]hole pair are calculated for various silicon surfaces. It is shown that EHL can exist on the (111) Si.

scholarly journals Excited States Calculations of MoS2@ZnO and WS2@ZnO Two-Dimensional Nanocomposites for Water-Splitting Applications

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 150
Author(s):  
Yin-Pai Lin ◽  
Boris Polyakov ◽  
Edgars Butanovs ◽  
Aleksandr A. Popov ◽  
Maksim Sokolov ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Optical Properties ◽  
Water Splitting ◽  
Excited States ◽  
Density Functional ◽  
Visible Region ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Functional Theory ◽  
Exchange Correlation

Transition metal dichalcogenide (TMD) MoS2 and WS2 monolayers (MLs) deposited atop of crystalline zinc oxide (ZnO) and graphene-like ZnO (g-ZnO) substrates have been investigated by means of density functional theory (DFT) using PBE and GLLBSC exchange-correlation functionals. In this work, the electronic structure and optical properties of studied hybrid nanomaterials are described in view of the influence of ZnO substrates thickness on the MoS2@ZnO and WS2@ZnO two-dimensional (2D) nanocomposites. The thicker ZnO substrate not only triggers the decrease of the imaginary part of dielectric function relatively to more thinner g-ZnO but also results in the less accumulated charge density in the vicinity of the Mo and W atoms at the conduction band minimum. Based on the results of our calculations, we predict that MoS2 and WS2 monolayers placed at g-ZnO substrate yield essential enhancement of the photoabsorption in the visible region of solar spectra and, thus, can be used as a promising catalyst for photo-driven water splitting applications.

scholarly journals Liquid-Phase Exfoliation of Poly(Dicarbon Monofluoride) (C2F)n

2020 ◽  
Author(s):  
Xianjue Chen ◽  
Marc Dubois ◽  
Silvana Radescu Cioranescu ◽  
Aditya Rawal ◽  
Chuan Zhao
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Single Layer ◽  
Two Dimensional ◽  
Functional Theory ◽  
Carbon Allotrope ◽  
Spectroscopic Analyses ◽  
The Density Functional Theory ◽  
New Form ◽  
Liquid Phase Exfoliation

Fluorinated single-layer diamond (“F-diamond”) is a new form of two-dimensional carbon allotrope. Herein, poly(dicarbon monofluoride) (C<sub>2</sub>F)<sub>n</sub> that is essentially made of stacked layers of “F-diamane” has been synthesized and exfoliated in a variety of solvents to yield well-dispersed ultrathin sheets. Microscopic and spectroscopic analyses revealed that the exfoliated sheets retained the “F-diamane”-like structure. The experimental results are supported by the density functional theory (DFT) calculations.

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