...
首页> 外文期刊>Physical review >Universal Band Gap Modulation By Radial Deformation In Semiconductor Single-walledcarbon Nanotubes
【24h】

Universal Band Gap Modulation By Radial Deformation In Semiconductor Single-walledcarbon Nanotubes

机译:半导体单壁碳纳米管中通过径向变形的通用带隙调制。

获取原文
获取原文并翻译 | 示例
           

摘要

We report on a universal band gap modulation by radial deformation found for semiconductor single-walled carbon nanotubes (SWNTs). The plausible radial deformation of an individual SWNT under hydrostatic pressure is predicted using the method developed in the previous work [M. Hasegawa and K. Nishidate, Phys. Rev. B 74, 115401 (2006)]. It is found by ab initio electronic-structure calculations that the band gap of zigzag SWNTs is dictated by the shape of the high-curvature edge region of a deformed cross section perpendicular to the tube axis: If we let R_(min) be an averaged curvature radius in that region, the band gap at the Γ point remains almost unchanged when R_(min) ≥ 3.2 A, and its closure occurs at R_(min) ≈ 2.4 A irrespective of tube size and cross-sectional shape as a whole. It is also confirmed that the band gap closure is accompanied by the concentration, in the high-curvature region, of the lowest conduction state at the Γ point. Possible implications of these results are discussed.
机译:我们报告了通过径向变形为半导体单壁碳纳米管(SWNTs)发现的通用带隙调制。使用在先的工作[M.Med.Chem.Soc。,2003,3,3,3,5,5,6,5,6,7,6,7,8,9,8,9,9,8,9,8,9,9,12,12,12,11,12,11,12,11,12,11,12,11,12,11,12,11,12,11,11,11,11都分别都预测了单个SWNT在流体静压力下的可能的径向变形。长谷川和西立K. B 74,115401(2006)。通过从头算电子结构计算发现,之字形SWNT的带隙由垂直于管轴的变形截面的高曲率边缘区域的形状决定:如果让R_(min)取平均值R_(min)≥3.2 A时,在该区域的曲率半径,Γ点处的带隙几乎保持不变,并且在R_(min)≈2.4 A时发生闭合,而与管子的尺寸和整个横截面形状无关。还证实带隙闭合伴随着在高曲率区域中在Γ点处的最低传导状态的集中。讨论了这些结果的可能含义。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号