| Inhomogeneities such as contacts have a dramatic effect on the low-energy transport properties of interacting one-dimensional quantum wires (Luttinger liquids). For decreasing temperature the linear response conductance through such systems is generically suppressed following a power law with exponents which depend on the strength of the two-particle interaction. We propose a nonequilibrium version of functional renormalization within the Keldysh formalism which allows to study the finite bias steady state current. For a wire coupled to two reservoirs we show that the nonequilibrium occupation induces new power law exponents for the conductance which are "nonuniversal" as they depend on the wire-reservoir coupling strength. |
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