Structural and electronic properties of GaN x As1−x alloys
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The structural and electronic properties of cubic GaN x As1−x with N-concentration varying between 0.0 and 1.0 with step of 0.25 were investigated using the full potential–linearized augmented plane wave (FP-LAPW) method. We have used the local density approximation (LDA) and the generalized gradient approximation (GGA) for the exchange and correlation potential. In addition the Engel-Vosko generalized gradient approximation (EVGGA) was used for the band-structure calculations. The structural properties of the binary and ternary alloys were investigated. The electronic band structure, total and partial density of states as well as the electron charge density were determined for both the binary and their related ternary alloys. The energy gap of the alloys decreases when we move from x=0.0 to 0.25; then it increases by a factor of about 1.8 when we move from 0.25 to 0.5, 0.75 and 1.0 using EVGGA. For both LDA and GGA moving from x=0.0 to 0.25 causes the band gap to close, showing the metallic nature of the GaN0.25As0.75 alloy. When the composition of N moves through x=0.25, 0.5, 0.75 and 1, the band gap increases.
KeywordsGaAs Bulk Modulus Ternary Alloy Generalize Gradient Approximation Local Density Approximation
Z.C, H.B and B.H would like to acknowledge Max-Planck institute for the financial support. For the author Ali Hussain Reshak this work was supported from the program RDI of the Czech Republic, the project CENAKVA (No. 1.05/2.1.00/01.0024), the grant No. 152/2010/Z of the Grant Agency of the University of South Bohemia. School of Material Engineering, Malaysia University of Perlis, P.O. Box 77, d/a Pejabat Pos Besar, 01007 Kangar, Perlis, Malaysia. Y.A. work was supported from FRGS grants numbered: 9003-00249 & 9003-00255, and the author would like to acknowledge TWAS-Italy and JUST-Jordan for their financial and technical supports, respectively, within his scientific visit under TWAS UNESCO Associateship.
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