Tunable indirect to direct band gap transition of Fe2TaX (X=Al and Ga) Heusler alloy under hydrostatic pressure effect

2022 ◽  
Vol 203 ◽  
pp. 111049
Author(s):  
Jaafar Jalilian ◽  
Ghasem Rezaei ◽  
Behrooz Vaseghi ◽  
Faramarz Kanjouri ◽  
Sheida Fakhri ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Band Gap ◽  
Heusler Alloy ◽  
Pressure Effect ◽  
Direct Band Gap ◽  
Direct Band

SHIFT OF BAND GAP FROM DIRECT TO INDIRECT AND OPTICAL RESPONSE OF LiF UNDER PRESSURE

2013 ◽  
Vol 27 (09) ◽  
pp. 1350061 ◽  
Author(s):  
A. SAJID ◽  
G. MURTAZA ◽  
A. H. RESHAK
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Lithium Fluoride ◽  
Pressure Range ◽  
Pressure Effect ◽  
Indirect Transition ◽  
Direct Band Gap ◽  
Direct Band ◽  
Indirect Band Gap

We hereby are reporting the transition pressure at which lithium fluoride ( LiF ) compound transforms from direct band gap to indirect band gap insulator on the basis of FP-LAPW calculations. The fundamental band gap of LiF compound suffers direct to indirect transition at a pressure of 70 GPa. The study of the pressure effect on the optical properties e.g. dielectric function, reflectivity, refractive index and optical conductivity of LiF in the pressure between 0–100 GPa, shows that this pressure range is very critical for LiF compound as there are significant changes in the optical properties of this compound.

Hydrostatic-pressure coefficient of the direct band-gap energy ofAlxGa1−xAsforx=0−0.35

1996 ◽  
Vol 53 (16) ◽  
pp. 10916-10920 ◽  
Author(s):  
Hyeonsik M. Cheong ◽  
J. H. Burnett ◽  
W. Paul ◽  
P. F. Hopkins ◽  
K. Campman ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Band Gap ◽  
Pressure Coefficient ◽  
Band Gap Energy ◽  
Direct Band Gap ◽  
Gap Energy ◽  
Direct Band

Direct band-gap measurement on epitaxial Co2FeAl0.5Si0.5 Heusler-alloy films

2015 ◽  
Vol 117 (17) ◽  
pp. 17D131 ◽  
Author(s):  
Tariq F. Alhuwaymel ◽  
Robert Carpenter ◽  
Chris Nga Tung Yu ◽  
Balati Kuerbanjiang ◽  
Ranjdar M. Abdullah ◽  
...  
Keyword(s):  
Band Gap ◽  
Heusler Alloy ◽  
Alloy Films ◽  
Direct Band Gap ◽  
Gap Measurement ◽  
Direct Band

Optical Studies of Poly (N-Carbazole) (PVK) Blending with Polyvinylpyrrolidone (PVP) Using Tauc/Davis-Mott Model

2013 ◽  
Vol 652-654 ◽  
pp. 527-531 ◽  
Author(s):  
A.N. Alias ◽  
T.I. Tunku Kudin ◽  
Z.M. Zabidi ◽  
M.K. Harun ◽  
Ab Malik Marwan Ali ◽  
...  
Keyword(s):  
Band Gap ◽  
Urbach Energy ◽  
Quartz Substrate ◽  
Optical Studies ◽  
Direct Band Gap ◽  
Mott Model ◽  
Blended Polymer ◽  
Electronic Parameters ◽  
Direct Band ◽  
Indirect Band Gap

The optical absorption spectra of blended poly (N-carbazole) (PVK) with polyvinylpyrrolidone (PVP) in various compositions are investigated. A doctor blade technique was used to coat the blended polymer on a quartz substrate. The electronic parameters such as absorption edge (Ee), allowed direct band gap (Ed), allowed indirect band gap (Ei), Urbach edge (Eu) and steepness parameter (γ) were calculated using Tauc/Davis-Mott Model. The results reveal that the Ee, Ed and Ei increase with increasing of PVP ratio. There also have variation changing in Urbach energy and steepness parameter.

Direct band gap optical emission from Ge islands grown on relaxed Si0.5Ge0.5/Si (100) substrate

2014 ◽  
Vol 115 (1) ◽  
pp. 013502 ◽  
Author(s):  
R. Aluguri ◽  
S. Manna ◽  
S. K. Ray
Keyword(s):  
Band Gap ◽  
Optical Emission ◽  
Direct Band Gap ◽  
Direct Band

Theoretical Derivations of a Direct Band Gap Semiconductor of SiC Doped with Ge

2014 ◽  
Vol 44 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Adit Ghosh ◽  
Chandrika Varadachari
Keyword(s):  
Band Gap ◽  
Direct Band Gap ◽  
Direct Band

Atomically Thin Arsenene and Antimonene: Semimetal-Semiconductor and Indirect-Direct Band-Gap Transitions

2015 ◽  
Vol 54 (10) ◽  
pp. 3112-3115 ◽  
Author(s):  
Shengli Zhang ◽  
Zhong Yan ◽  
Yafei Li ◽  
Zhongfang Chen ◽  
Haibo Zeng
Keyword(s):  
Band Gap ◽  
Direct Band Gap ◽  
Direct Band
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