Nonlinear current response of an isolated system of interacting fermions

Nonlinear current response of an isolated system of interacting fermions

Nonlinear real-time response of interacting particles is studied on the example of a one-dimensional tight-binding model of spinless fermions driven by electric field. Using equations of motion and numerical methods we show that for a nonintegrable case at finite temperatures the major effect of non...

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Veröffentlicht in:Physical review letters 2010-10, Vol.105 (18), p.186405-186405, Article 186405
Hauptverfasser: Mierzejewski, Marcin, Prelovšek, Peter
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creator Mierzejewski, Marcin
Prelovšek, Peter
description Nonlinear real-time response of interacting particles is studied on the example of a one-dimensional tight-binding model of spinless fermions driven by electric field. Using equations of motion and numerical methods we show that for a nonintegrable case at finite temperatures the major effect of nonlinearity can be taken into account within the linear response formalism extended by a renormalization of the kinetic energy due to the Joule heating. On the other hand, integrable systems show on constant driving a different universality with a damped oscillating current whereby the frequency is related but not equal to the Bloch oscillations.
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title Nonlinear current response of an isolated system of interacting fermions
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