• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Conference on Ultrafast Phenomena in Semiconductors and Nanostructure Materials; 20080120-23; San Jose,CA(US) >Excitons and Many-electron Effects in the Optical Response of Carbon Nanotubes and Other One-dimensional Nanostructures
【24h】

Excitons and Many-electron Effects in the Optical Response of Carbon Nanotubes and Other One-dimensional Nanostructures

机译：碳纳米管和其他一维纳米结构的光响应中的激子和多电子效应

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Owing to their reduced dimensionality, the behavior of quasi-one-dimensional systems is often strongly influenced by electron-electron interactions. We discuss some recent work on using theory and computation to understand and predict the electronic structure and the linear optical response of several one-dimensional (ID) nanostructures. The calculations are carried out employing a first-principles interacting-electron Green's function approach. It is shown that exciton states in the semiconducting carbon nanotubes have binding energies that are orders of magnitude larger than bulk semiconductors and hence they dominate the optical spectrum at all temperature, and that strongly bound excitons can exist even in metallic carbon nanotubes. In addition to the optically active (bright) exciton states, theory predicts a number of optically inactive or very weak oscillator strength (dark) exciton states. These findings demonstrate the importance of an exciton picture in interpreting optical experiments and in the possible applications of the carbon nanotubes. Our studies show that many-electron interaction (self-energy and excitonic) effects are equally dominant in the electronic structure and optical response of other potentially useful quasi-1D nanostructures such as the BN nanotubes, Si nanowires, and graphene nanoribbons.
机译：由于它们的降维，准一维系统的行为通常受到电子-电子相互作用的强烈影响。我们讨论了有关使用理论和计算来理解和预测几个一维（ID）纳米结构的电子结构和线性光学响应的​​最新工作。使用第一原理相互作用电子格林函数方法进行计算。结果表明，半导体碳纳米管中的激子态具有比块状半导体大的数量级的结合能，因此它们在所有温度下都主导着光谱，并且即使在金属碳纳米管中也可以存在牢固结合的激子。除了光学活跃（明亮）的激子状态，理论上还预测了许多光学无效或非常弱的振荡器强度（黑暗）激子状态。这些发现证明了激子图片在解释光学实验和碳纳米管可能应用中的重要性。我们的研究表明，在其他可能有用的准1D纳米结构（如BN纳米管，Si纳米线和石墨烯纳米带）的电子结构和光学响应中，多电子相互作用（自能和激子）效应同样占主导地位。

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