Dielectric screening effects on transition energies in aligned carbon nanotubes

Dyatlova OA, Gomis-Bresco J, Malic E, Telg H, Maultzsch J, Zhong G, Geng J, Woggon U (2012)

Publication Status: Published

Publication Type: Journal article

Publication year: 2012

Journal

Physical Review B American Physical Society

Publisher: AMER PHYSICAL SOC

Book Volume: 85

Journal Issue: 24

DOI: 10.1103/PhysRevB.85.245449

Abstract

The optical transition energies E-ii of carbon nanotubes (CNTs) strongly depend on the dielectric function epsilon(q) of the nanotubes and the dielectric background constant epsilon(bg) of their surroundings. It becomes particularly evident when CNTs in solution and free-standing, vertically aligned CNTs are compared via their optical spectra. Using photoluminescence-excitation spectroscopy, we determine the first two transition energies for these two types of carbon-nanotube samples, i.e., for CNT-solution and CNT-forest samples. We observe considerable energy shifts and explain them by microscopic calculations based on the density-matrix formalism. Combining experiment and theory, we determine the dielectric background constant of the CNT-forest and CNT-solution samples to be 1.3 +/- 0.1 and 1.8 +/- 0.1, respectively.

Authors with CRIS profile

Janina Maultzsch Lehrstuhl für Experimentalphysik

Involved external institutions

Technische Universität Berlin DE Germany (DE) University of Cambridge GB United Kingdom (GB) University of Bolton GB United Kingdom (GB)

How to cite

APA:

Dyatlova, O.A., Gomis-Bresco, J., Malic, E., Telg, H., Maultzsch, J., Zhong, G.,... Woggon, U. (2012). Dielectric screening effects on transition energies in aligned carbon nanotubes. Physical Review B, 85(24). https://doi.org/10.1103/PhysRevB.85.245449

MLA:

Dyatlova, Olga A., et al. "Dielectric screening effects on transition energies in aligned carbon nanotubes." Physical Review B 85.24 (2012).

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