Vibrational effects in the linear conductance of carbon nanotubesM. Gheorghe1, R. Gutiérrez1, N. Ranjan2, A. Pecchia3, A. Di Carlo3 and G. Cuniberti1
1 Institute for Theoretical Physics, University of Regensburg D-93040 Regensburg, Germany
2 Institute for Physical Chemistry, Technical University of Dresden D-01069 Dresden, Germany
3 INFM and Dipartimento di Ingegneria Elettronica, Università di Roma "Tor Vergata" I-00133 Roma, Italy
received 9 March 2005; accepted in final form 30 May 2005
published online 6 July 2005
We study the influence of structural lattice fluctuations on the elastic electron transport in single-wall carbon nanotubes within a density-functional-based scheme. In the linear-response regime, the linear conductance is calculated via configurational averages over the distorted lattice. Results obtained from a frozen-phonon approach as well as from molecular-dynamics simulations are compared. We further suggest that the effect of structural fluctuations can be qualitatively captured by the Anderson model with bond disorder. The influence of individual vibrational modes on the electronic transport is discussed as well as the role of zero-point fluctuations.
73.63.-b - Electronic transport in nanoscale materials and structures.
73.63.Fg - Nanotubes.
63.22.+m - Phonons or vibrational states in low-dimensional structures and nanoscale materials.
© EDP Sciences 2005