Abstract
Microscopic modeling of electronic phase coherence versus energy dissipation plays a crucial role in the design and optimization of new-generation electronic quantum nanodevices, like quantum-cascade light sources and quantum logic gates; in this context, non-Markovian density-matrix approaches are widely used simulation strategies. Here we show that such methods, along with valuable virtues, in some circumstances may exhibit potential limitations that need to be taken into account for a reliable description of quantum materials and related devices. More specifically, extending the analysis recently proposed in [EPL 112, 67005 (2015)] to high temperatures and degenerate conditions, we show that the usual mean-field treatment – employed to derive quantum-kinetic equations – in some cases may lead to anomalous results, characterized by decoherence suppression and positivity violations. By means of a simple two-level model, we show that such unexpected behaviors may affect zero-dimensional electronic systems coupled to dispersionless phonon modes, while such anomalies are expected to play a negligible role in nanosystems with higher dimensionality; these limitations are found to be significant in the low-density and low-temperature limit, while in the degenerate and/or finite-temperature regime – typical of many state-of-the-art quantum devices – their impact is strongly reduced.
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Iotti, R.C., Rossi, F. Phonon-induced dissipation and decoherence in solid-state quantum devices: Markovian versus non-Markovian treatments. Eur. Phys. J. B 90, 250 (2017). https://doi.org/10.1140/epjb/e2017-80462-3
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DOI: https://doi.org/10.1140/epjb/e2017-80462-3