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Papers by christian thomsen

Research paper thumbnail of Chirality Distribution and Transition Energies of Carbon Nanotubes

Physical Review Letters, 2004

Research paper thumbnail of Raman spectroscopy on single- and multi-walled nanotubes under high pressure

Applied Physics A-materials Science & Processing, 1999

The pressure dependence of the high-energy Raman modes in single- and multi-walled carbon nanotub... more The pressure dependence of the high-energy Raman modes in single- and multi-walled carbon nanotubes was measured in the range 0–10 GPa. We found the pressure coefficient to be linear in both materials but 25% smaller in MWNT. Given that the curvature effects on vibrational properties of the rolled-up graphene sheets are small, we can explain this difference simply with elasticity theory.

Research paper thumbnail of Tight-binding description of graphene

Research paper thumbnail of Ab initio calculations of the optical properties of 4-Å-diameter single-walled nanotubes

Research paper thumbnail of Resonant Raman spectroscopy of nanotubes: One contribution of 13 to a Theme 'Raman spectroscopy in carbons: from nanotubes to diamond

Philosophical Transactions of The Royal Society A: Mathematical, Physical and Engineering Sciences, 2004

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

Research paper thumbnail of Phonon Dispersion in Graphite

Physical Review Letters, 2004

Research paper thumbnail of Elastic properties of carbon nanotubes under hydrostatic pressure

Research paper thumbnail of Double Resonant Raman Scattering in Graphite

Physical Review Letters, 2000

We find that the electronic dispersion in graphite gives rise to double resonant Raman scattering... more We find that the electronic dispersion in graphite gives rise to double resonant Raman scattering for excitation energies up to 5 eV. As we show, the curious excitation-energy dependence of the graphite D mode is due to this double resonant process resolving a long-standing problem in the literature and invalidating recent attempts to explain this phenomenon. Our calculation for the D-mode frequency shift ( 60 cm(-1)/eV) agrees well with the experimental value.

Research paper thumbnail of Electronic band structure of isolated and bundled carbon nanotubes

Research paper thumbnail of Raman spectroscopy of graphite: One contribution of 13 to a Theme 'Raman spectroscopy in carbons: from nanotubes to diamond

Philosophical Transactions of The Royal Society A: Mathematical, Physical and Engineering Sciences, 2004

Research paper thumbnail of Phonon dispersion of graphite by inelastic x-ray scattering

Research paper thumbnail of Shear strain in carbon nanotubes under hydrostatic pressure

Physical Review B, 2000

We investigated the hydrostatic and shear strain components introduced in the graphite hexagons b... more We investigated the hydrostatic and shear strain components introduced in the graphite hexagons by applying hydrostatic pressure to single-walled carbon nanotubes. The vibrational modes are expected to show different pressure derivatives depending on the polarization of the eigenvector with respect to the nanotube axis, but independent of chirality. A comparison with tight-binding calculations allows us to estimate the Grüneisen parameter

Research paper thumbnail of Exciton binding energies in carbon nanotubes from two-photon photoluminescence

Physical Review B, 2005

... RAPID COMMUNICATIONS PHYSICAL REVIEW B 72, 241402 R 2005 Exciton binding energies in carbon n... more ... RAPID COMMUNICATIONS PHYSICAL REVIEW B 72, 241402 R 2005 Exciton binding energies in carbon nanotubes from two-photon photoluminescence J. Maultzsch,1,* R. Pomraenke,2 S. Reich,3 E. Chang,4 D. Prezzi,4 A. Ruini,4 E. Molinari,4 MS Strano,5 C. Thomsen,1 ...

Research paper thumbnail of Chirality Distribution and Transition Energies of Carbon Nanotubes

Physical Review Letters, 2004

Research paper thumbnail of Raman spectroscopy on single- and multi-walled nanotubes under high pressure

Applied Physics A-materials Science & Processing, 1999

The pressure dependence of the high-energy Raman modes in single- and multi-walled carbon nanotub... more The pressure dependence of the high-energy Raman modes in single- and multi-walled carbon nanotubes was measured in the range 0–10 GPa. We found the pressure coefficient to be linear in both materials but 25% smaller in MWNT. Given that the curvature effects on vibrational properties of the rolled-up graphene sheets are small, we can explain this difference simply with elasticity theory.

Research paper thumbnail of Tight-binding description of graphene

Research paper thumbnail of Ab initio calculations of the optical properties of 4-Å-diameter single-walled nanotubes

Research paper thumbnail of Resonant Raman spectroscopy of nanotubes: One contribution of 13 to a Theme 'Raman spectroscopy in carbons: from nanotubes to diamond

Philosophical Transactions of The Royal Society A: Mathematical, Physical and Engineering Sciences, 2004

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

Research paper thumbnail of Phonon Dispersion in Graphite

Physical Review Letters, 2004

Research paper thumbnail of Elastic properties of carbon nanotubes under hydrostatic pressure

Research paper thumbnail of Double Resonant Raman Scattering in Graphite

Physical Review Letters, 2000

We find that the electronic dispersion in graphite gives rise to double resonant Raman scattering... more We find that the electronic dispersion in graphite gives rise to double resonant Raman scattering for excitation energies up to 5 eV. As we show, the curious excitation-energy dependence of the graphite D mode is due to this double resonant process resolving a long-standing problem in the literature and invalidating recent attempts to explain this phenomenon. Our calculation for the D-mode frequency shift ( 60 cm(-1)/eV) agrees well with the experimental value.

Research paper thumbnail of Electronic band structure of isolated and bundled carbon nanotubes

Research paper thumbnail of Raman spectroscopy of graphite: One contribution of 13 to a Theme 'Raman spectroscopy in carbons: from nanotubes to diamond

Philosophical Transactions of The Royal Society A: Mathematical, Physical and Engineering Sciences, 2004

Research paper thumbnail of Phonon dispersion of graphite by inelastic x-ray scattering

Research paper thumbnail of Shear strain in carbon nanotubes under hydrostatic pressure

Physical Review B, 2000

We investigated the hydrostatic and shear strain components introduced in the graphite hexagons b... more We investigated the hydrostatic and shear strain components introduced in the graphite hexagons by applying hydrostatic pressure to single-walled carbon nanotubes. The vibrational modes are expected to show different pressure derivatives depending on the polarization of the eigenvector with respect to the nanotube axis, but independent of chirality. A comparison with tight-binding calculations allows us to estimate the Grüneisen parameter

Research paper thumbnail of Exciton binding energies in carbon nanotubes from two-photon photoluminescence

Physical Review B, 2005

... RAPID COMMUNICATIONS PHYSICAL REVIEW B 72, 241402 R 2005 Exciton binding energies in carbon n... more ... RAPID COMMUNICATIONS PHYSICAL REVIEW B 72, 241402 R 2005 Exciton binding energies in carbon nanotubes from two-photon photoluminescence J. Maultzsch,1,* R. Pomraenke,2 S. Reich,3 E. Chang,4 D. Prezzi,4 A. Ruini,4 E. Molinari,4 MS Strano,5 C. Thomsen,1 ...

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