Unexpected linear conductivity in Landau-Zener model: limitations and improvements of the relaxation time approximation in the quantum master equation

Abstract

The nonequilibrium steady states of quantum materials have many challenges. Here, we highlight issues with the relaxation time approximation (RTA) for the DC conductivity in insulating systems. The RTA to the quantum master equation (QME) is frequently employed as a simple method, yet this phenomenological approach is exposed as a fatal approximation, displaying metallic DC conductivity in insulating systems within the linear response regime. We find that the unexpected metallic behavior is caused by the fact that the density matrix in the RTA incompletely incorporates the first order of the external field. To solve this problem, we have derived a new calculation scheme based on the QME that ensure correct behavior in low electric fields. Our method reproduces well the overall features of the exact electric currents in the whole field region. It is not time-consuming, and its application to lattice systems is straightforward. This method will encourage progress in this research area as a simple way to more accurately describe nonequilibrium steady states.

10 pages, 3 figures

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Cited by in corpus (6)

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• Floquet theory and applications in open quantum and classical systems
• Multi-tunneling effect of nonreciprocal Landau-Zener tunneling: Insights from DC field responses
• Problem of nonlinear conductivity within relaxation time approximation in noncentrosymmetric insulators
• Geometric Effects on Tunneling in Driven Quantum Systems