Berlin 2012 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Focus Session: Structural Ordering and Electronic Transport II (jointly with CPP)

HL 13.6: Talk

Monday, March 26, 2012, 16:45–17:00, ER 270

Elucidating excitonic coupling in supramolecular dye nanotubes — •Dorthe M. Eisele¹, Dylan H. Arias¹, Colby P. Steiner¹, Robert J. Silbey¹, Xiaofeng Fu², Daniela Nicastro², Keith A. Nelson¹, and Moungi G. Bawendi¹ — ¹MIT, USA — ²Brandeis University, USA

Self-assembled molecular nanotubes, in particular those strongly absorbing visible light, are highly promising quasi-1d systems for opto-electronic and light harvesting (LH) applications. A detailed understanding of the energetics, dynamics, and couplings of excitonic states in these nanoscale systems is the key for further development of such applications. We report on a remarkable example of such a system, i.e., well-defined nanotubular aggregates of amphiphilic cyanine dyes [1]. By means of cryogenic electron microscopy and 2d electronic spectroscopy, we show that excitonic interactions in such nanoscale systems are not only highly sensitive to changes within the supramolecular structure, but also to changes in higher ordering [2]. This addresses the fundamental question of what physical properties control the energy transport processes in excitonic nanoscale systems, which are vital for new developments in opto-electronic applications.

[1] D.M. Eisele, et al., Nature Nanotech. 4 (2009); D.M. Eisele, et al., JACS Comm. 132 (2010); D.M. Eisele, C.M. Cone, E.A. Bloemsma, S.M. Vlaming, R.J. Silbey, M.G. Bawendi, J. Knoester, J.P. Rabe, and D.A. Vanden Bout (submitted);[2] D.M. Eisele, D.H. Arias, C.P. Steiner, X. Fu, D. Nicastro, K.A. Nelson, and M.G. Bawendi (to be submitted)