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Instanton theory of the subgap internal tunneling in chain conductors

Instanton theory of the subgap internal tunneling in chain conductors. S. Matveenko and S. Brazovskii Landau Institute LPTMS,Orsay. We suggest a theory of internal coherent tunneling in the pseudogap region where the applied voltage is below the free electron gap.

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Instanton theory of the subgap internal tunneling in chain conductors

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  1. Instanton theory of the subgap internal tunneling in chain conductors S. Matveenko and S. Brazovskii Landau Institute LPTMS,Orsay

  2. 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 spontaneous lattice distortions (Peierls effect) like in CDWs or in polyacethylene, as well as generically gapful systems like conjugated polymers, semiconducting nanotubes and quantum wires of semiconductors. Their common property is a deep selftraping of electrons and possibly their pairs into solitons, polarons, bipolarons. The applied instanton approach allows to calculate the interchain tunneling current both in single electron (polarons, amplitude solitons) and bi-particle (bipolarons, phase solitons) channels.

  3. Calculation J(U):(1.commensurate CDW case)

  4. The transverse current:

  5. Bi-electron tunneling

  6. Bi-electronic tunnelingResults:

  7. ICDW Results

  8. Conclusions

  9. High order thresholds

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