Zero-dimensional dissipative action possesses nontrivial 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 nonequilibrium conditions. Possible applications of the theory to transport in strongly biased quantum dots are discussed.
|Journal||Physical Review B|
|State||Published - 22 Apr 2016|
Bibliographical noteFunding Information:
This work has been supported by ISF (Grant No. 584/14), GIF (Grant No. 1167-165.14/2011), the Dutch Science Foundation NWO/FOM 13PR3118, and by the EU Network FP7-PEOPLE-2013-IRSES Grant No. 612624 "InterNoM". We acknowledge useful discussions with R. Berkovits, L. Bitton, I. Burmistrov, A. Frydman, I. Gornyi, A. Kamenev, A. Mirlin, R. Santos, and E. Dalla Torre.
©2016 American Physical Society.