Preprint article · Journal article
Removing all periodic boundary conditions: Efficient nonequilibrium Green's function calculations
Department of Applied Mathematics and Computer Science, Technical University of Denmark1
Department of Physics, Technical University of Denmark2
Center for Nanostructured Graphene, Centers, Technical University of Denmark3
Nanomaterials and Devices, Department of Physics, Technical University of Denmark4
We describe a method and its implementation for calculating electronic structure and electron transport without approximating the structure using periodic supercells. This effectively removes spurious periodic images and interference effects. Our method is based on already established methods readily available in the nonequilibrium Green's function formalism and allows for nonequilibrium transport.
We present examples of a nitrogen defect in graphene, finite voltage bias transport in a point contact to graphene, and a graphene-nanoribbon junction. This method is less costly, in terms of CPU hours, than the supercell approximation.
Language: | English |
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Year: | 2019 |
Pages: | 8 |
ISSN: | 24699969 , 24699950 , 1550235x and 10980121 |
Types: | Preprint article and Journal article |
DOI: | 10.1103/physrevb.100.195417 |
ORCIDs: | Papior, Nick Rübner , 0000-0003-3610-3231 , Leitherer, Susanne and Brandbyge, Mads |