Subgap tunneling through channels of polarons and bipolarons in chain conductors

Details Subgap tunneling through channels of polarons and bipolarons in chain conductors Subgap tunneling through channels of polarons and bipolarons in chain conductors

2005-10-11

arxiv.org/abs/cond-mat/0510257v1

Phys. Rev. B 72, 085120 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 8 postscript figures

Scientific paper

10.1103/PhysRevB.72.085120

We suggest a theory of internal coherent tunneling in the pseudogap region where the applied voltage is below the free electron gap. We consider quasi 1D systems where the gap is originated by a lattice dimerization like in polyacethylene, as well as low symmetry 1D semiconductors. Results may be applied to several types of conjugated polymers, to semiconducting nanotubes and to quantum wires of semiconductors. The approach may be generalized to tunneling in strongly correlated systems showing the pseudogap effect, like the family of High Tc materials in the undoped limit. We demonstrate the evolution of tunneling current-voltage characteristics from smearing the free electron gap down to threshold for tunneling of polarons and further down to the region of bi-electronic tunneling via bipolarons or kink pairs.

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