Pedersen, Thomas Garm1; Pedersen, Kjeld1; Cornean, Horia Decebal2; Duclos, Pierre3
1 Department of Physics and Nanotechnology, The Faculty of Engineering and Science, Aalborg University, VBN2 Department of Mathematical Sciences, The Faculty of Engineering and Science, Aalborg University, VBN3 unknown
The linear optical properties of semiconducting carbon nanotubes are dominated by quasi-one-dimensional excitons formed by single electron-hole pairs. Hence, the nonlinear response at high pump levels most likely leads to the formation of exciton complexes involving several electron-hole pairs. Such complexes would threfore play an important role in e.g. lasing applications. We demonstrate here that the biexciton complex is surprisingly stable for nanotubes in a wide diameter range. Theoretical predictions for the signature of such states in pump-probe spectroscopy are presented.