Instantons in the out-of-equilibrium Coulomb blockade

A. S. Dotdaev, Ya Rodionov, K. Tikhonov

Research output: Contribution to journalArticlepeer-review


Physical properties of single-electron devices in the weak Coulomb blockade regime are significantly dependent on non-perturbative effects. They arise as instanton solutions of equations of motion for the corresponding Ambegaokar-Eckern-Schön action. In equilibrium those solutions are known as Korshunov instantons. In this paper we study non-equilibrium Ambegaokar-Eckern-Schön action using Keldysh technique. We found instantons for the most general stationary out-of-equilibrium state. We also found that action saddle-point value assumes a universal value irrespective of the stationary non-equilibrium state.

Original languageEnglish
Article number127736
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Publication statusPublished - 17 Dec 2021


  • AES-action
  • Coulomb-blockade
  • Instantons
  • Non-equilibrium


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