Figure 1

(a) Local electronic density of states of an (9,2) carbon nanotube crossing a bundle, as revealed by elastic scanning tunneling spectroscopy. The $dI/dV$ signal is measured under open feedback conditions along the tube axis. (b) Topographic STM image of the corresponding nanotube; note that the tube extends for further 150 Å on the right side of the crossing point. (c) Trace lines of the $dI/dV$ at region I (red), II (black), and III (green). The trace line of region II has been shifted for clarity. The color horizontal lines represent the zero $dI/dV$ signal for the respective regions. The large density of state at the Fermi level in region III (green) is characteristic of a metallic character. (d) Schematic description of the tube and the corresponding contact potential. The line on top of the nanotube is the measured line profile along the tube axis.Reuse & Permissions

Figure 2

Local vibrational density of states of the (9,2) carbon nanotube crossing a bundle as revealed by inelastic scanning tunneling spectroscopy. the $d{I}^2/d{V}^2$ signal is measured in open feedback conditions along the tube axis. The region of the tangential mode (a) and the radial breathing mode (b) are displayed; the dotted line (in b) is a guide to the eye. (c) Corresponding STM topography.Reuse & Permissions