Non-equilibrium transport at a dissipative quantum phase transition
arXiv:0811.1230 · doi:10.1103/PhysRevLett.102.216803
Abstract
We pioneerly investigate the non-equilibrium transport near a quantum phase transition in a generic and relatively simple case model, the dissipative resonant level model, that has many ramifications in nanosystems. We formulate a rigorous mapping and apply a controlled frequency-dependent renormalization group approach to compute the non-equilibrium current in the presence of a finite bias voltage V. For V -> 0, we find that the conductance has its well-known equilibrium form, while it displays a distinct non-equilibrium profile at finite voltage.
4 pages, 5 figures, minor corrections, to be published in Physical Review Letters
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