Theory of coherent phonons in carbon nanotubes and graphene nanoribbons

摘要: We survey our recent theoretical studies on the generation and detection of coherent radial breathing mode (RBM) phonons in single-walled carbon nanotubes like (RBLM) graphene nanoribbons. present a microscopic theory for electronic states, phonon modes, optical matrix elements electron‐phonon interaction that allows us to calculate spectrum. An extended tight-binding (ETB) model has been used structure valence force field (VFF) modes. The amplitudes satisfy driven oscillator equation with driving term depending photoexcited carrier density. discuss dependence spectrum nanotube chirality type, also nanoribbon mod number class (armchair versus zigzag). compare these results simpler effective mass where reasonable agreement main features is found. In particular, helps understand initial phase oscillations given type. two different experiments nanotubes: (i) micelle suspended tubes (ii) aligned films. case nanoribbons, there are no experimental observations date. discuss, based evaluation elements, amplitude its Finally, we previously unpublished zigzag nanoribbons obtained using an theory. (Some figures may appear colour only online journal)