Nonequilibrium functional renormalization group for interacting quantum systems

Details Nonequilibrium functional renormalization group for interacting quantum systems Nonequilibrium functional renormalization group for interacting quantum systems

2007-02-21

arxiv.org/abs/cond-mat/0702494v2

Phys. Rev. Lett. 99, 150603 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures; published version

Scientific paper

10.1103/PhysRevLett.99.150603

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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