Abstract
Recent optical measurements on single‐walled carbon nanotubes (SWCNT) showed highly anomalous behaviors indicating strong many‐electron effects. To understand these data, we performed ab initio calculation of electron‐hole interaction (excitonic) effects on the optical spectra of several SWCNTs. We employed a many‐electron Green’s function approach that determines both the quasiparticle and optical excitations from first principles. For both semiconducting and metallic SWCNTs, we found that their optical spectra are strongly affected by excitonic effects. These large many‐electron effects explain the unusual optical response of these quasi‐one‐dimensional systems.
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