Insulator-metal transition in biased finite polyyne systems
Abstract
A method for the study of the electronic transport in strongly coupled electron-phonon systems is formalized and applied to a model of polyyne chains biased through metallic Au leads. We derive a stationary non equilibrium polaronic theory in the general framework of a variational formulation. The numerical procedure we propose can be readily applied if the electron-phonon interaction in the device hamiltonian can be approximated as an effective single particle electron hamiltonian. Using this approach, we predict that finite polyyne chains should manifest an insulator-metal transition driven by the non-equilibrium charging which inhibits the Peierls instability characterizing the equilibrium state.
- Publication:
-
European Physical Journal B
- Pub Date:
- August 2009
- DOI:
- 10.1140/epjb/e2009-00220-6
- arXiv:
- arXiv:0906.0269
- Bibcode:
- 2009EPJB...70..311L
- Keywords:
-
- 63.22.-m Phonons or vibrational states in low-dimensional structures and nanoscale materials;
- 64.70.Nd Structural transitions in nanoscale materials;
- 73.63.-b Electronic transport in nanoscale materials and structures;
- 63.22.-m;
- 64.70.Nd;
- 73.63.-b;
- Phonons or vibrational states in low-dimensional structures and nanoscale materials;
- Structural transitions in nanoscale materials;
- Electronic transport in nanoscale materials and structures;
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Materials Science
- E-Print:
- to appear at EPJB