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Many-body e ffects in Electronic Bandgaps of Carbon Nanotubes measured by Scanning Tunneling Spectroscopy

H. Lin, J. Lagoute, V. Repain, C. Chacon, Y. Girard, J.-S. Lauret, F. Ducastelle, A. Loiseau, and S. Rousset, Nature Materials 9, 235 (2010)

Single-walled carbon nanotubes provide an ideal system for studying the properties of one-dimensional (1D) materials, where strong electron-electron interactions are expected1. Optical measurements have recently reported the existence of excitons in semiconducting nanotubes, revealing the importance of many-body effects2, 3, 4. Surprisingly, pioneering electronic structure calculations5, 6, 7 and scanning tunnelling spectroscopy (STS) experiments8, 9, 10 report the same gap values as optical experiments. Here, an experimental STS study of the bandgap of single-walled semiconducting nanotubes, demonstrates a continuous transition from the gap reduced by the screening resulting from the metal substrate to the intrinsic gap dominated by many-body interactions. These results provide a deeper knowledge of many-body interactions in these 1D systems and a better understanding of their electronic properties, which is a prerequisite for any application of nanotubes in the ultimate device miniaturization for molecular electronics11, 12, or spintronics13.*

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