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The European Physical Journal B

, Volume 70, Issue 3, pp 311–316 | Cite as

Insulator-metal transition in biased finite polyyne systems

  • A. La MagnaEmail author
  • I. Deretzis
  • V. Privitera
Solid State and Materials

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.

PACS

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 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.CNR–IMM, Z.I. VIII Strada 5CataniaItaly

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