• 文献标题:   Magnetoexcitons and Faraday rotation in single-walled carbon nanotubes and graphene nanoribbons
  • 文献类型:   Article
  • 作  者:   HAVE J, PEDERSEN TG
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:   Aalborg Univ
  • 被引频次:   7
  • DOI:   10.1103/PhysRevB.97.115405
  • 出版年:   2018

▎ 摘  要

The magneto-optical response of single-walled carbon nanotubes (CNTs) and graphene nanoribbons (GNRs) is studied theoretically, including excitonic effects. Both diagonal and nondiagonal response functions are obtained and employed to compute Faraday rotation spectra. For single-walled CNTs in a parallel field, the results show field-dependent splitting of the exciton absorption peaks caused by brightening a dark exciton state. Similarly, for GNRs in a perpendicular magnetic field, we observe a field-dependent shift of the exciton peaks and the emergence of an absorption peak above the energy gap. Results show that excitonic effects play a significant role in the optical response of both materials, particularly for the off-diagonal tensor elements.