Ballistic Transport in Carbon Nanotubes from First-Principles Molecular Dynamics Simulations
Author(s)Lee, Young-Su; Nardelli, Marco Buongiorno; Marzari, Nicola
We determined the Landauer ballistic conductance of pristine nanotubes at finite temperature via a novel scheme that combines ab-initio molecular dynamics, maximally-localized Wannier functions, and a tight-binding formulation of electronic transport in nanostructures. Large-scale ab-initio molecular dynamics simulations are used to obtain efficiently accurate trajectories in phase space. The extended Bloch orbitals for states along these trajectories are converted into maximally-localized orbitals, providing an exact mapping of the ground-state electronic structure onto a short-ranged Hamiltonian. Green's functions, self-energies, and ballistic conductance can then be obtained for any given configuration, and averaged over the appropriate statistical ensemble.
Advanced Materials for Micro- and Nano-Systems (AMMNS);
carbon nanotubes and nanostructures, Landauer conductance, first-principles, Wannier functions