Measuring many-body effects in carbon nanotubes with a scanning tunneling microscope

Details Measuring many-body effects in carbon nanotubes with a scanning tunneling microscope Measuring many-body effects in carbon nanotubes with a scanning tunneling microscope

2009-07-02

arxiv.org/abs/0907.0344v1

Physics

Condensed Matter

Materials Science

Scientific paper

Electron-electron interactions and excitons in carbon nanotubes are locally measured by combining Scanning tunneling spectroscopy and optical absorption in bundles of nanotubes. The largest gap deduced from measurements at the top of the bundle is found to be related to the intrinsic quasi-particle gap. From the difference with optical transitions, we deduced exciton binding energies of 0.4 eV for the gap and 0.7 eV for the second Van Hove singularity. This provides the first experimental evidence of substrate-induced gap renormalization on SWNTs.

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