Coherent Phonons in Carbon Nanotubes and Graphene

Abstract

We review recent studies of coherent phonons (CPs) corresponding to the radial breathing mode (RBM) and G-mode in single-wall carbon nanotubes (SWCNTs) and graphene. Because of the bandgap-diameter relationship, RBM-CPs cause bandgap oscillations in SWCNTs, modulating interband transitions at terahertz frequencies. Interband resonances enhance CP signals, allowing for chirality determination. Using pulse shaping, one can selectively excite speci!c-chirality SWCNTs within an ensemble. G-mode CPs exhibit temperature-dependent dephasing via interaction with RBM phonons. Our microscopic theory derives a driven oscillator equation with a density-dependent driving term, which correctly predicts CP trends within and between (2n+m) families. We also find that the diameter can initially increase or decrease. Finally, we theoretically study the radial breathing like mode in graphene nanoribbons. For excitation near the absorption edge, the driving term is much larger for zigzag nanoribbons. We also explain how the armchair nanoribbon width changes in response to laser excitation.

48 pages, 41 figures

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Cited by in corpus (10)

• High-Harmonic Spectroscopy of Coherent Lattice Dynamics in Graphene
• Ultrafast Generation of Fundamental and Multiple-order Phonon Excitations in Highly-Enriched (6,5) Single-Wall Carbon Nanotubes
• Spectrally resolved detection in transient-reflectivity measurements of coherent optical phonons in diamond
• Probing phonon-driven symmetry alterations in graphene via high-harmonic spectroscopy
• Coherent control theory and experiment of optical phonons in diamond
• Copropagating edge states produced by the interaction between electrons and chiral phonons in two-dimensional materials
• Origin of coherent G band phonon spectra in single wall carbon nanotubes
• Excitonic effects on coherent phonon dynamics in single wall carbon nanotubes
• Hypersound Absorption of Acoustic Phonons in a degenerate Carbon Nanotube
• Selective coherent phonon mode generation in single wall carbon nanotubes