Stephanie Reich

Raman spectroscopy of graphite

We present a review of the Raman spectra of graphite from an experimental and theoretical point of view. The disorder–induced Raman bands in this material have been a puzzling Raman problem for almost 30 years. Double–resonant Raman scattering explains their origin as well as the excitation–energy dependence, the overtone spectrum and the difference between Stokes and anti–Stokes scattering. We develop the symmetry–imposed selection rules for double–resonant Raman scattering in graphite and point out misassignments in previously published works. An excellent agreement is found between the graphite phonon dispersion from double–resonant Raman scattering and other experimental methods.

Exciton binding energies in carbon nanotubes from two-photon photoluminescence

Excitonic effects in the linear and nonlinear optical properties of single-walled carbon nanotubes are manifested by photoluminescence excitation experiments and ab initio calculations. One- and two-photon spectra showed a series of exciton states; their energy splitting is the fingerprint of excitonic interactions in carbon nanotubes. By ab initio calculations we determine the energies, wave functions, and symmetries of the excitonic states. Combining experiment and theory we find binding energies of

Chirality distribution and transition energies of carbon nanotubes.

0.3\char21{}0.4\phantom{\rule{0.3em}{0ex}}\mathrm{eV}

Radial breathing mode of single-walled carbon nanotubes : Optical transition energies and chiral-index assignment

for nanotubes with diameters between 6.8 and

Phonon dispersion of graphite by inelastic x-ray scattering

9.0\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}

Raman characterization of boron-doped multiwalled carbon nanotubes

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Polarized Plasmonic Enhancement by Au Nanostructures Probed through Raman Scattering of Suspended Graphene

From resonant Raman scattering on isolated nanotubes we obtained the optical transition energies, the radial breathing mode frequency, and the Raman intensity of both metallic and semiconducting tubes. We unambiguously assigned the chiral index (n(1),n(2)) of approximately 50 nanotubes based solely on a third-neighbor tight-binding Kataura plot and find omega(RBM)=(214.4+/-2) cm(-1) nm/d+(18.7+/-2) cm(-1). In contrast to luminescence experiments we observe all chiralities including zigzag tubes. The Raman intensities have a systematic chiral-angle dependence confirming recent ab initio calculations.

Structure and formation energy of carbon nanotube caps

We present a comprehensive study of the chiral-index assignment of carbon nanotubes in aqueous suspensions by resonant Raman scattering of the radial breathing mode. We determine the energies of the first optical transition in metallic tubes and of the second optical transition in semiconducting tubes for more than 50 chiral indices. The assignment is unique and does not depend on empirical parameters. The systematics of the so-called branches in the Kataura plot are discussed; many properties of the tubes are similar for members of the same branch. We show how the radial breathing modes observed in a single Raman spectrum can be easily assigned based on these systematics. In addition, empirical fits provide the energies and radial breathing modes for all metallic and semiconducting nanotubes with diameters between 0.6 and 1.5 nm. We discuss the relation between the frequency of the radial breathing mode and tube diameter. Finally, from the Raman intensities we obtain information on the electron-phonon coupling.

Raman Scattering in Carbon Nanotubes

We present the full in-plane phonon dispersion of graphite obtained from inelastic x-ray scattering, including the optical and acoustic branches, as well as the mid-frequency range between the

Lattice dynamics of hexagonal and cubic InN: Raman-scattering experiments and calculations

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