Dresden 2014 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 18: Carbon: Diamond, nanotubes and Buckyballs
HL 18.7: Vortrag
Montag, 31. März 2014, 16:30–16:45, POT 112
Charge carrier scattering with acoustic phonons in chirality enriched carbon nanotubes — •Peter Vogel1, Olga Dyatlova1, Ulrike Woggon1, Christopher Köhler2, Ermin Malic2, Andreas Knorr2, Rishabh Jain3, Kevin Tvrdy3, and Michael Strano3 — 1Institut für Optik und Atomare Physik, Technical University of Berlin — 2Institut für theoretische Physik, Technical University of Berlin — 3Department of Chemical Engineering, Massachusetts Institute of Technology
By using two-color pump-probe measurements we investigate the carrier relaxation dynamics in (7,5) carbon nanotubes at different combinations of pump and probe energies. The sample was characterized by PLE spectroscopy and is highly chirality enriched for (7,5) tubes solved in water with 5% sodium dodecyl sulfate (SDS). For pumping resonant to the E22-transition energy (1.922 eV) and probing resonant to E11-transition energy (1.206 eV), typical multi-exponential decay behaviour occurs[1]. By fixing the pump energy at E22 of the (7,5) species and tuning the probe energy from resonant to E11 up to the band (1.563 eV), we observe an acceleration of the relaxation dynamics of the first ps-component. This result is in agreement with predicted theoretical results[2]. Density matrix formalism is applied obtaining microscopic access to time- and momentum-resolved relaxation dynamics driven by scattering with acoustic phonons.
[1] O.A. Dyatlova et al., Nano Lett. 12, 2249 (2012)
[2] C. Köhler et al., Phys. Status Solidi (b) 249, 2483 (2012)