Communication: Master equations for electron transport: The limits of the Markovian limit

Master equations are increasingly popular for the simulation of time-dependent electronic transport in nanoscale devices. Several recent Markovian approaches use “extended reservoirs”—explicit degrees of freedom associated with the electrodes—distinguishing them from many previous classes of master...

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Bibliographic Details
Published in:The Journal of chemical physics 2017-10, Vol.147 (15), p.151101-151101
Main Authors: Elenewski, Justin E., Gruss, Daniel, Zwolak, Michael
Format: Article
Language:English
Subjects:
Electrodes
Electron transport
Electronic devices
Markov processes
Mathematical analysis
Nanotechnology devices
Pauli exclusion principle
Reservoirs
Time dependence
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Summary:Master equations are increasingly popular for the simulation of time-dependent electronic transport in nanoscale devices. Several recent Markovian approaches use “extended reservoirs”—explicit degrees of freedom associated with the electrodes—distinguishing them from many previous classes of master equations. Starting from a Lindblad equation, we develop a common foundation for these approaches. Due to the incorporation of explicit electrode states, these methods do not require a large bias or even “true Markovianity” of the reservoirs. Nonetheless, their predictions are only physically relevant when the Markovian relaxation is weaker than the thermal broadening and when the extended reservoirs are “sufficiently large,” in a sense that we quantify. These considerations hold despite complete positivity and respect for Pauli exclusion at any relaxation strength.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.5000747