Redshift of excitons in carbon nanotubes caused by the environment polarizability

Details Redshift of excitons in carbon nanotubes caused by the environment polarizability Redshift of excitons in carbon nanotubes caused by the environment polarizability

2011-09-22

arxiv.org/abs/1109.4845v1

Phys. Rev. Lett. 108, 087402 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.108.087402

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 non-local polarizability effects on the electronic structure. Here we focus on the example of a semiconducting 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.

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