Dissipative dynamics of a quantum two-state system in presence of nonequilibrium quantum noise

Niklas Mann (), Jochen Brüggemann and Michael Thorwart
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Niklas Mann: Institut für Theoretische Physik, Universität Hamburg
Jochen Brüggemann: Institut für Theoretische Physik, Universität Hamburg
Michael Thorwart: Institut für Theoretische Physik, Universität Hamburg

The European Physical Journal B: Condensed Matter and Complex Systems, 2016, vol. 89, issue 12, 1-10

Abstract: Abstract We analyze the real-time dynamics of a quantum two-state system in the presence of nonequilibrium quantum fluctuations. The latter are generated by a coupling of the two-state system to a single electronic level of a quantum dot which carries a nonequilibrium tunneling current. We restrict to the sequential tunneling regime and calculate the dynamics of the two-state system, of the dot population, and of the nonequilibrium charge current on the basis of a diagrammatic perturbative method valid for a weak tunneling coupling. We find a nontrivial dependence of the relaxation and dephasing rates of the two-state system due to the nonequilibrium fluctuations which is directly linked to the structure of the unperturbed central system. In addition, a Heisenberg-Langevin-equation of motion allows us to calculate the correlation function of the nonequilibrium fluctuations. By this, we obtain a generalized nonequilibrium fluctuation relation which includes the equilibrium fluctuation-dissipation theorem in the limit of zero transport voltage. A straightforward extension to the case with a time-periodic ac voltage is shown.

Keywords: Mesoscopic; and; Nanoscale; Systems (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1140/epjb/e2016-70600-x

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