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Nonlinear fluctuation conductivity in N(S)N contacts

K.S. Tikhonov, M.V. Feigel’man

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Outline

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Quantum corrections to conductivity

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QC in non-Ohmic regime

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Interaction corrections in the Coulomb channel: Non-Ohmic regime

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Interaction corrections in the Cooper channel

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‘Heating’ effect of electric field

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Weak (gaussian) fluctuations

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Fluctuation corrections: diagrammatic approach (linear response)

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Fluctuation corrections to conductivity due to SC fluctuations: phenomenology

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Usadel equation

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Usadel equation: cont.

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Usadel equation: solution

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Kinetic equation: e-e interactions

Electric current

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Bosonic action

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Bosonic action: high fields

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Fluctuation corrections

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Fluctuation corrections: results for T~Tc

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Nonlinear conductivity: T~Tc

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Conclusion/Outlook

Thank you!