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RESEARCH PRODUCT
Effective bias and potentials in steady-state quantum transport: A NEGF reverse-engineering study
Daniel KarlssonClaudio Verdozzisubject
PhysicsReverse engineeringHistorySteady state (electronics)Strongly Correlated Electrons (cond-mat.str-el)Condensed Matter - Mesoscale and Nanoscale PhysicsFOS: Physical sciencesInteraction strengthcomputer.software_genreComputer Science ApplicationsEducationCondensed Matter - Strongly Correlated ElectronsQuantum transportPartitioned systemsChain (algebraic topology)Mesoscale and Nanoscale Physics (cond-mat.mes-hall)Green's functionsStatistical physicsPerturbation theorycomplex systemscomputerdescription
Using non-equilibrium Green’s functions combined with many-body perturbation theory, we have calculated steady-state densities and currents through short interacting chains subject to a finite electric bias. By using a steady-state reverse-engineering procedure, the effective potential and bias which reproduce such densities and currents in a non-interacting system have been determined. The role of the effective bias is characterised with the aid of the so-called exchange-correlation bias, recently introduced in a steady-state density-functionaltheory formulation for partitioned systems. We find that the effective bias (or, equivalently, the exchange-correlation bias) depends strongly on the interaction strength and the length of the central (chain) region. Moreover, it is rather sensitive to the level of many-body approximation used. Our study shows the importance of the effective/exchange-correlation bias out of equilibrium, thereby offering hints on how to improve the description of densityfunctional-theory based approaches to quantum transport. peerReviewed
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-01-01 | Journal of Physics: Conference Series |