Eur. Phys. J. B 17, 301-308 (2000)
https://doi.org/10.1007/s100510070145

A mechanism for cutting carbon nanotubes with a scanning tunneling microscope

¹ Departamento de Física Teórica, Universidad de Valladolid, 47011 Valladolid, Spain
² Departamento de Física de Materiales, Euskal Herriko Unibertsitatea, Aptdo. 1072, San Sebastian 20080, Basque Country and Donostia International Physics Center, San Sebastian, Spain
³ Department of Applied Physics, Chalmers University of Technology and Göteborg University, 41296 Göteborg, Sweden
⁴ Department of Applied Sciences and DIMES, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

Received: 6 April 2000
Published online: 15 September 2000

Abstract

We discuss the local cutting of single-walled carbon nanotubes by a voltage pulse to the tip of a scanning tunneling microscope. The tip voltage ( V) is the key physical quantity in the cutting process. After reviewing several possible physical mechanisms we conclude that the cutting process relies on the weakening of the carbon-carbon bonds through a combination of localized particle-hole excitations induced by inelastically tunneling electrons and elastic deformation due to the electric field between tip and sample. The carbon network releases part of the induced mechanical stress by forming topological defects that act as nucleation centers for the formation of dislocations that dynamically propagate towards bond-breaking.