Redshift of Excitons in Carbon Nanotubes Caused by the Environment Polarizability

Autor(en): Rohlfing, Michael
Stichwörter: EXCITATIONS; OPTICAL-SPECTRA; Physics; Physics, Multidisciplinary
Erscheinungsdatum: 2012
Herausgeber: AMER PHYSICAL SOC
Journal: PHYSICAL REVIEW LETTERS
Volumen: 108
Ausgabe: 8
Zusammenfassung: 
Optical excitations of molecular systems can be modified by their physical environment. We analyze the underlying mechanisms within many-body perturbation theory, which is particularly suited to study nonlocal polarizability effects on the electronic structure. Here we focus on the example of a semi-conducting carbon nanotube, which observes redshifts of its excitons when the tube is touched by another nanotube or other physisorbates. We show that the redshifts mostly result from the polarizability of the attached ad system. Electronic coupling may enhance the redshifts, but depends very sensitively on the structural details of the contact.
ISSN: 00319007
DOI: 10.1103/PhysRevLett.108.087402

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