Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 31: Poster II
HL 31.47: Poster
Dienstag, 26. Februar 2008, 16:30–19:00, Poster D
Influence of the Coulomb interaction on linear and nonlinear optical properties of single-wall carbon nanotubes — •Matthias Hirtschulz1, Frank Milde1, Ermin Malic1, Stefan Butscher1, Christian Thomsen2, Stefanie Reich3, and Andreas Knorr1 — 1Institut für Theoretische Physik, Technische Universität Berlin, Germany. — 2Institut für Festkörperphysik, Technische Universität Berlin, Germany. — 3Fachbereich Physik, Freie Universität Berlin, Germany.
We present an optical Bloch equation approach to linear and nonlinear optical properties of single-wall carbon nanotubes. Within a density matrix theory the equations of motion for the coherent interband transitions and electron band occupations are obtained. The electron-electron interaction is treated on both the mean-field (screened Hartree-Fock approximation) and the correlation level. This approach allows to describe linear absorption as well as ultrafast nonlinear dynamics of these quasi one-dimensional systems. Linear excitonic absorption spectra are used to benchmark our approach. We find a band renormalization and the formation of excitons in carbon nanotubes on the mean-field level. To elucidate ultrafast and non-equilibrium effects, we will give several examples for the ultrafast nonlinear dynamics including the optical Stark effect. Finally, we will give an outlook on the influence of Coulomb scattering on the nonlinear optical properties of carbon nanotubes.