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HL: Fachverband Halbleiterphysik

HL 32: C/diamond

HL 32.2: Talk

Wednesday, March 28, 2007, 16:45–17:00, H14

Pressure-induced phenomena in single-walled carbon nanotubes — •K. Thirunavukkuarasu¹, C.A. Kuntscher¹, Á. Pekker², K. Kamarás², F. Hennrich³, M. Kappes^3,4, and Y. Iwasa⁵ — ¹Experimentalphysik II, Universität Augsburg, D-86159 Augsburg, Germany — ²Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, P.O.Box 49, Budapest, Hungary H 1525 — ³Institut für Nanotechnologie, Forschungzentrum Karlsruhe, D-76021 Karlsruhe, Germany — ⁴Physikalische Chemie, Universität Karlsruhe, D-76128 Karlsruhe, Germany — ⁵Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)

The study of single-walled carbon nanotubes (SWNTs) under high pressure has attracted much interest recently as the application of pressure induces structural deformations of the SWNTs and also tunes the intertube interactions by changing the distances between the tubes. Both should significantly affect the properties of the SWNTs.

We studied the optical response of thin films of both unoriented and oriented SWNTs over a broad frequency range (IR-VIS) and for pressures up to 8 GPa. The effect of pressure on oriented nanotubes caused major changes in the optical properties only for the polarization along the nanotube axis. We will discuss in detail the effect of pressure on the electronic properties like interband transitions for the different SWNT films.

Supported by the DFG, Emmy Noether-program. Provision of beamtime at the ANKA Angströmquelle Karlsruhe is acknowledged.