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• W2051461048 abstract "Irradiation by laser pulses and a fluctuating surrounding liquid environment can, for example, lead to time-dependent effects in the transport through molecular junctions. From the theoretical point of view, time-dependent theories of quantum transport are still challenging. In one of these existing transport theories, the energy-dependent coupling between molecule and leads is decomposed into Lorentzian functions. This trick has successfully been combined with quantum master approaches, hierarchical formalisms, and non-equilibrium Green's functions. The drawback of this approach is, however, its serious limitation to certain forms of the molecule-lead coupling and to higher temperatures. Tian and Chen [J. Chem. Phys. 137, 204114 (2012)] recently employed a Chebychev expansion to circumvent some of these latter problems. Here, we report on a similar approach also based on the Chebychev expansion but leading to a different set of coupled differential equations using the fact that a derivative of a zeroth-order Bessel function can again be given in terms of Bessel functions. Test calculations show the excellent numerical accuracy and stability of the presented formalism. The time span for which this Chebychev expansion scheme is valid without any restrictions on the form of the spectral density or temperature can be determined a priori." @default.
• W2051461048 created "2016-06-24" @default.
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• W2051461048 date "2015-04-15" @default.
• W2051461048 modified "2023-10-03" @default.
• W2051461048 title "Using the Chebychev expansion in quantum transport calculations" @default.
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• W2051461048 doi "https://doi.org/10.1063/1.4917198" @default.
• W2051461048 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25903862" @default.
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