Elucidation of the electronic structure of semiconducting single-walled carbon nanotubes by electroabsorption spectroscopy

摘要

We report benchmark calculations of electroabsorption in semiconductingsingle-walled carbon nanotubes to provide motivation to experimentalists toperform electroabsorption measurement on these systems. We show thatelectroabsorption can detect continuum bands in different energy manifolds,even as other nonlinear absorption measurements have failed to detect them.Direct determination of the binding energies of excitons in higher manifoldsthereby becomes possible. We also find that electroabsorption can provideevidence for Fano-type coupling between the second exciton and the lowestcontinuum band states.