Stability and signatures of biexcitons in carbon nanotubes.
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 therefore 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.
Pedersen
Thomas G
TG
Aalborg University, Department of Physics and Nanotechnology, Pontoppidanstraede 103, DK-9220 Aalborg Øst, Denmark. tgp@physics.aau.dk
Pedersen
Kjeld
K
Cornean
Horia D
HD
Duclos
Pierre
P
D003198:Computer Simulation; D008027:Light; D008956:Models, Chemical; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000528:radiation effects*; D010777:Photochemistry / Q000379:methods*; D011522:Protons; D012666:Semiconductors
D037742:Nanotubes, Carbon; D011522:Protons