Magneto-excitons and Faraday rotation in single-walled carbon nanotubes and graphene nanoribbons

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Abstrakt

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.

OriginalsprogEngelsk
Artikelnummer115405
TidsskriftPhysical Review B
Vol/bind97
Udgave nummer11
Antal sider8
ISSN2469-9950
DOI
StatusUdgivet - 2018

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