Premium
Excitons in carbon nanotubes
Author(s) -
Maultzsch J.,
Pomraenke R.,
Reich S.,
Chang E.,
Prezzi D.,
Ruini A.,
Molinari E.,
Strano M. S.,
Thomsen C.,
Lienau C.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200669131
Subject(s) - exciton , excitation , carbon nanotube , biexciton , parity (physics) , atomic physics , wave function , ab initio , luminescence , photon , physics , ab initio quantum chemistry methods , molecular physics , chemistry , condensed matter physics , materials science , nanotechnology , quantum mechanics , optics , molecule
We present two‐photon excitation luminescence experiments on carbon nanotubes which show the excitonic origin of the optical excitations. The two‐photon allowed exciton state, which has even parity under rotation about the U ‐axis, is roughly 300 meV above the one‐photon active, odd‐parity state. This indicates exciton binding energies on the order of 400 meV for nanotubes with diameters around 8 Å. Ab‐initio calculations of the exciton wavefunctions and energies are in good agreement with our experimental results, confirming the predictions on the symmetry of the exciton states. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)