Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 56: Heterostructures, Interfaces and Surfaces II

HL 56.6: Talk

Friday, March 22, 2024, 10:45–11:00, EW 561

Properties of higher order Raman modes in confined carbyne — •Johannes Lechner — Institut für Physik und IRIS Adlershof, Humboldt-Universität zu Berlin

Confined carbyne consists of long linear carbon chains (more than 100 atoms) inside carbon nanotubes and is considered a close, stable analogue to the truly 1-dimensional carbon allotrope carbyne. Here we investigate the higher order modes of the Raman active C-mode of single confined carbyne chains by confocal resonant Raman spectroscopy. We observe large frequency shifts which imply strongly anharmonic properties. Analyzing the relative intensities of Raman peaks of different order, we unravel major fluctuations depending on the excitation wavelength, particularly for the second order. Unexpectedly, the relative intensities of different Raman mode orders also change with the frequency of the C-mode. These new discoveries enable further insight into the structural and electronic properties of confined carbyne as a material system.

Keywords: carbyne; carbon nanotubes; Raman spectroscopy; optical spectroscopy