Electro-optical properties of zigzag and armchair boron nitride nanotubes under a transverse electric field: Tight binding calculations

被引：22
作者：
Chegel, Raad [1 ]
Behzad, Somayeh [2 ]
机构：
[1] Malayer Univ, Dept Phys, Fac Sci, Malayer, Iran
[2] Kermanshah Univ Technol, Dept Nano Sci, Kermanshah, Iran
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2012年 / 73卷 / 02期
关键词：
Nanostructures; Semiconductors; Electronic structure; Optical properties; BAND-STRUCTURE MODULATION; OPTICAL-PROPERTIES; CARBON NANOTUBES; ADSORPTION; PRISTINE;
D O I：
10.1016/j.jpcs.2011.11.013
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The electro-optical properties of zigzag and armchair BNNTs in a uniform transverse electric field are investigated within tight binding approximation. It is found that the electric field modifies the band structure and splits band degeneracy where these effects reflect in the DOS and JDOS spectra. A decrease in the band gap, as a function of the electric field, is observed. This gap reduction increases with the diameter and it is independent of chirality. An analytic function to estimate the electric field needed for band gap closing is proposed which is in good agreement with DFT results. In additional, we show that the larger diameter tubes are more sensitive than small ones. Number and position of peaks in DOS and JDOS spectra for armchair and zigzag tubes with similar radius are dependent on electric field strength. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：154 / 161
页数：8
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