Moradian, Rostam, Azadi, Sam and Vasheghani Farahani, Soheil. (2008) Structure and electronic properties of native and defected gallium nitride nanotubes. Physics Letters. Section A: General, Atomic and Solid State Physics, Vol.372 (No.46). pp. 6935-6939. ISSN 0375-9601

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Abstract

Structure and electronic properties of GaN nanotubes (GaNNTs) are investigated by using ab initio density functional theory. By full optimization, the optimized structures (bond-lengths and angles between them) of zigzag GaNNTs (n, 0) and armchair GaNNTs (a, n) (4 < n < 11) are calculated. The difference between nitrogen ring diameter and gallium ring diameter (buckling distance) and semiconducting energy gap in term of diameter for zigzag and armchair GaNNTs have also been calculated. We found that buckling distance decreases by increasing nanotube diameter. Furthermore, we have investigated the effects of nitrogen and gallium vacancies on structure and electronic properties of zigzag GaNNT (5, 0) using spin dependent density functional theory. By calculating the formation energy, we found that N vacancy in GaNNT (5, 0) is more favorable than Ga vacancy. The nitrogen vacancy in zigzag GaNNT induces a 1.0 mu(B) magnetization and makes a polarized Structure. We have shown that in polarized GaNNT a flat band near the Fermi energy splits to occupied spin tip and unoccupied spin down levels. (C) 2008 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Nanotubes -- Electric properties, Gallium nitride
Journal or Publication Title:	Physics Letters. Section A: General, Atomic and Solid State Physics
Publisher:	Elsevier BV
ISSN:	0375-9601
Date:	17 November 2008
Volume:	Vol.372
Number:	No.46
Number of Pages:	5
Page Range:	pp. 6935-6939
Identification Number:	10.1016/j.physleta.2008.09.044
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Iran. Vizārat-i ʻUlūm, Taḥqīqāt va Fannāvarī [Iran. Ministry of Science, Research and Technology]
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URI:	http://wrap.warwick.ac.uk/id/eprint/28821

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