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Signature of Anomalous Exciton Localization in the Optical Response of Self-Assembled Organic Nanotubes

E. A. Bloemsma, S. M. Vlaming, V. A. Malyshev, and J. Knoester
Phys. Rev. Lett. 114, 156804 – Published 17 April 2015

Abstract

We show that the disorder scaling of the low-temperature optical absorption linewidth of tubular molecular assemblies sharply contrasts with that known for one-dimensional aggregates. The difference can be explained by an anomalous localization of excitons, which arises from the combination of long-range intermolecular interactions and the tube’s higher-dimensional geometry. As a result, the exciton density of states near the band bottom drops to zero, leading to a strong suppression of exciton localization. Our results explain the strong linear dichroism and weak exciton-exciton scattering in tubular J aggregates observed in experiments and suggest that for nanoscale wirelike applications a tubular shape is to be preferred over a truly one-dimensional chain.

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  • Received 30 May 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.156804

© 2015 American Physical Society

Authors & Affiliations

E. A. Bloemsma, S. M. Vlaming, V. A. Malyshev, and J. Knoester*

  • Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

  • *Corresponding author. j.knoester@rug.nl

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Vol. 114, Iss. 15 — 17 April 2015

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