Coherent radial breathing like phonons in carbon nanoribbons

Details Coherent radial breathing like phonons in carbon nanoribbons Coherent radial breathing like phonons in carbon nanoribbons

2012-01-25

arxiv.org/abs/1201.5339v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

19 pages, 25 figures

Scientific paper

We have developed a microscopic theory for the generation and detection of coherent phonons in armchair and zigzag carbon nanoribbons using an extended tight-binding model for the electronic states and a valence force field model for the phonons. The coherent phonon amplitudes satisfy a driven oscillator equation with the driving term depending on photoexcited carrier density. We examine the coherent phonon radial breathing like mode amplitudes as a function of excitation energies and nanoribbon types. For photoexcitation near the optical absorption edge the coherent phonon driving term for the radial breathing like mode is much larger for zigzag nanoribbons where transitions between localized edge states provide the dominant contribution to the coherent phonon driving term. Using an effective mass theory, we explain how the armchair nanoribbon width changes in response to laser excitation.

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