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Proceedings Paper

Excitons and many-electron effects in the optical response of carbon nanotubes and other one-dimensional nanostructures
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Paper Abstract

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 (1D) 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.

Paper Details

Date Published: 14 February 2008
PDF: 9 pages
Proc. SPIE 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII, 68920U (14 February 2008); doi: 10.1117/12.764027
Show Author Affiliations
Jack Deslippe, Univ. of California, Berkeley (United States)
Lawrence Berkeley National Lab. (United States)
Steven G. Louie, Univ. of California, Berkeley (United States)
Lawrence Berkeley National Lab. (United States)


Published in SPIE Proceedings Vol. 6892:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII
Jin-Joo Song; Kong-Thon Tsen; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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