Simple theoretical analysis of the density-of-states function of Kane type semiconductors in the presence of an external electric field

2007 ◽  
Vol 387 (1-2) ◽  
pp. 333-343 ◽  
Author(s):  
P.K. Chakraborty ◽  
S. Choudhury ◽  
K.P. Ghatak
Keyword(s):  
Theoretical Analysis ◽  
Electric Field ◽  
External Electric Field ◽  
Density Of States

scholarly journals Study on Electronic and Optical Properties of Graphene Oxide Under an External Electric Field From First-principles

2021 ◽  
Author(s):  
Abdehafid Najim ◽  
Omar BAJJOU ◽  
Mustapha BOULGHALLAT ◽  
Mohammed Khenfouch ◽  
Khalid Rahmani
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Electric Field ◽  
Band Gap ◽  
External Electric Field ◽  
Density Of States ◽  
Density Functional ◽  
Partial Density ◽  
Total Density ◽  
Electronic And Optical Properties

Abstract Electronic and optical properties of graphene oxide (GO), under an external electric field (Eext) applied in three directions of space (x, y, z), are investigated using the density functional theory (DFT). The application of the Eext, causes a significant modifications to the electronic and optical properties of GO material. It has change the band gap, total density of states (TDOS), partial density of states (PDOS), absorption coefficient (α), dielectric function, optical conductivity, refractive index and loss function. The band gap of GO layer increases under the effects of the Eext, applied in x and y directions. On the other hand, for z direction, the band gap decreases by the effects of the Eext. The peaks of the TDOS around the Fermi level, change by the Eext applied in (x, y, z) directions. The α peaks of the GO sheet, decreases by the Eext applied in x direction, and increases if Eext applied in y and z directions. It is found that, the electronic and optical properties of GO layer, could be affected by the effects of the Eext and by its direction of application.

scholarly journals First-Principles Study on Electronic and Optical Properties of Single-Walled Carbon Nanotube Under an External Electric Field

2021 ◽  
Author(s):  
Abdelhafid NAJIM ◽  
Omar BAJJOU ◽  
Khalid RAHMANI ◽  
Mohammed khenfouch
Keyword(s):  
Optical Properties ◽  
Carbon Nanotube ◽  
Electric Field ◽  
Absorption Coefficient ◽  
Band Gap ◽  
External Electric Field ◽  
Density Of States ◽  
Single Walled Carbon Nanotube ◽  
Electronic And Optical Properties ◽  
Single Walled Carbon

Abstract In this study, the electronic and optical properties of one-dimensional (1D) Single-Walled Carbon Nanotube (SWCNT) nanostructures, under an external electric field (𝐸𝑒𝑥𝑡 ) effects applied in z direction, are investigated using density functional theory (DFT) calculations. The Visualizer module of Material Studio software used to construct single-layer nanotube. Then, we use the CASTEP code for optimize and calculate the band structure, density of states and optical properties of carboxyl group substitution on Single-Walled Carbon Nanotube (SWCNT/Carboxyl). The 𝐸𝑒𝑥𝑡 effects lead to modulate the band gap and change the total density of states (TDOS), partial density of states (PDOS), absorption coefficient, dielectric function, optical conductivity, refractive index and loss function. The application of an 𝐸𝑒𝑥𝑡 effect on SWCNT/Carboxyl structure, lead to close its band gap. The peaks of TDOS around the fermi level are very weak. The absorption coefficient increases in visible range and decreases in ultraviolet (UV) domain, by reason of increased an 𝐸𝑒𝑥𝑡 effects. It is found that electronic structures and optical properties of SWCNT/Carboxyl, could be affected by the 𝐸𝑒𝑥𝑡 effects. All these results provide the important information for understanding and controlling the electronic and optical properties of 1D-crystals by an 𝐸𝑒𝑥𝑡 effects. This study can provide certain theoretical basis for our future experimental work of optoelectronic properties of SWCNT/Carboxyl material.

Time-resolved X-ray reciprocal space mapping of the crystal under external electric field

2018 ◽  
Vol 189 (02) ◽  
pp. 187-194 ◽  
Author(s):  
Nikita V. Marchenkov ◽  
Anton G. Kulikov ◽  
Ivan I. Atknin ◽  
Arsen A. Petrenko ◽  
Alexander E. Blagov ◽  
...  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Space Mapping ◽  
Reciprocal Space ◽  
Reciprocal Space Mapping ◽  
Time Resolved ◽  
X Ray

2D Few Cycle Optical Pulses in Silicene in the Presence of External Electric Field

2017 ◽  
Vol 9 (3) ◽  
pp. 03044-1-03044-3
Author(s):  
M. B. Belonenko ◽  
◽  
N. N. Konobeeva ◽  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Optical Pulses
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