Korshunov instantons out of equilibrium

TL;DR

This paper extends the concept of Korshunov instantons from equilibrium to non-equilibrium systems using the real-time Keldysh approach, enabling analysis of dissipative effects in biased quantum dots.

Contribution

It reconstructs and generalizes Korshunov instantons within a real-time framework for the first time, broadening their applicability to non-equilibrium conditions.

Findings

Generalized Korshunov instantons for non-equilibrium systems.

Formulated dissipative action theory for biased quantum dots.

Discussed potential applications to quantum transport phenomena.

Abstract

Zero-dimensional dissipative action possesses non-trivial minima known as Korshunov instantons. They have been known so far only for imaginary time representation that is limited to equilibrium systems. In this work we reconstruct and generalise Korshunov instantons using real-time Keldysh approach. This allows us to formulate the dissipative action theory for generic non-equilibrium conditions. Possible applications of the theory to transport in strongly biased quantum dots are discussed..