Triplet state absorption in carbon nanotubes: a TD-DFT study.

نویسنده

  • Sergei Tretiak
چکیده

We predict properties of triplet excited states in single-walled carbon nanotubes (CNTs) using a time-dependent density-functional theory (TD-DFT). We show that the lowest triplet state energy in CNTs to be about 0.2-0.3 eV lower than the lowest singlet state energies. Like in pi-conjugated polymers, the lowest CNT triplets are spatially localized. These states show strong optical absorption at about 0.5-0.6 eV to the higher lying delocalized triplet states. These results demonstrate striking similarity of the electronic features between CNTs and pi-conjugated polymers and provide explicit guidelines for spectroscopic detection of CNT triplet states.

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عنوان ژورنال:
  • Nano letters

دوره 7 8  شماره 

صفحات  -

تاریخ انتشار 2007