Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 18: Plasmonics and Nanooptics I: Microscopy
HL 18.5: Vortrag
Montag, 7. März 2016, 16:15–16:30, S054
Probing and Controlling Electronic and Vibrational Coherences in Individual Carbon Nanotubes using Femtosecond Pulse Shaping Microscopy — •Veit Giegold1,2, Richard Ciesielski1,2, Nicolai F. Hartmann3, Erik H. Haroz3, Stephen K. Doorn3, and Achim Hartschuh1,2 — 1Department Chemie and CeNS, LMU Munich, 81377 Munich — 2Nanosystems Initiative Munich, 80799 Munich — 3Los Alamos National Laboratory, New Mexico, 87545 United States
We probe and coherently manipulate the exciton population of individual semiconducting single-walled carbon nanotubes (SWCNTs) at room temperature using femtosecond laser pulse shaping microscopy [1,2]. In our experiment, the exciton state E11 of defect-doped (5,4)-SWCNTs is resonantly excited by a pair of phase-locked 20 fs laser pulses while the photoluminescence (PL) emission of the defect state E11D serves as reporter for the E11-population. Tuning the pulse delay and relative carrier envelope phase results in damped PL intensity oscillations that can be described using the Bloch equations for a two-level system.
We show that light absorption of individual SWCNTs can be controlled within their electronic dephasing time, ranging from 20 to 66 fs for different nanotubes. For longer pulse separations coherent radial breathing mode excitations with a
period of 90 fs are observed.
R. Hildner, D. Brinks, N.F. van Hulst, Nature Physics (2010).
R. Ciesielski, V. Giegold, A. Hartschuh, et al., in prep.