Charge-carrier dynamics in single-wall carbon nanotube bundles: a time-domain study |
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Authors: | T Hertel R Fasel G Moos |
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Institution: | (1) Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195 Berlin, Germany, DE;(2) EMPA Dübendorf, überlandstr. 129, 8600 Dübendorf, Switzerland, CH |
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Abstract: | We present a real-time investigation of ultra-fast carrier dynamics in single-wall carbon nanotube bundles using femtosecond
time-resolved photoelectron spectroscopy. The experiments allow us to study the processes governing the sub-picosecond and
the picosecond dynamics of non-equilibrium charge carriers. On the sub-picosecond time scale the dynamics are dominated by
ultra-fast electron–electron scattering processes, which lead to internal thermalization of the laser-excited electron gas.
We find that quasiparticle lifetimes decrease strongly as a function of their energy up to 2.38 eV above the Fermi level –
the highest energy studied experimentally. The subsequent cooling of the laser-heated electron gas to the lattice temperature
by electron–phonon interaction occurs on the picosecond time scale and allows us to determine the electron–phonon mass-enhancement
parameter λ. The latter is found to be over an order of magnitude smaller if compared, for example, with that of a good conductor
such as copper.
Received: 4 March 2002 / Accepted: 7 March 2002 / Published online: 3 June 2002 |
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Keywords: | PACS: 78 47 +p 81 07 De 78 67 Ch |
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