Nonequilibrium functional renormalization group for interacting quantum systems
Severin G. Jakobs, Volker Meden, Herbert Schoeller
TL;DR
This paper introduces a nonequilibrium functional renormalization group method within the Keldysh formalism, enabling analysis of quantum systems out of equilibrium and revealing new power law behaviors in conductance.
Contribution
It develops a unified cutoff scheme for equilibrium and nonequilibrium systems using a complex flow parameter in the Fermi or Bose functions.
Findings
New power law exponents for conductance in nonequilibrium quantum wires
Unified approach applicable to both equilibrium and nonequilibrium scenarios
Application to transport in interacting quantum systems
Abstract
We propose a nonequilibrium version of functional renormalization within the Keldysh formalism by introducing a complex valued flow parameter in the Fermi or Bose functions of each reservoir. Our cutoff scheme provides a unified approach to equilibrium and nonequilibrium situations. We apply it to nonequilibrium transport through an interacting quantum wire coupled to two reservoirs and show that the nonequilibrium occupation induces new power law exponents for the conductance.
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