Journal article
Speeding up tight binding calculations using zone-folding methods
Computational materials science, Vol.211, p.111479
08/01/2022
DOI: 10.1016/j.commatsci.2022.111479
Abstract
Tight binding models are widely used in large scale electronic structure calculations of nanostructures. Their atomistic nature makes them flexible, but also means the computational cost increases rapidly with system size. The large number of calculations required to design nanostructures makes computational efficiency desirable. We have developed a method to increase computational speed while retaining most of its accuracy. The method is based on the use of supercells and zone folding combined with a truncation of the Hamiltonians to only include states close to the band-edges. We apply the method to model the band edge energies of a GaAs/AlAs quantum well grown along the [110]-directions with 3D and 2D periodic boundary conditions as well as the density of states and dielectric function of the quantum well. We typically find a speed-up of ten times with only a small loss of accuracy of the calculation result.
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•A method to increase computational speed while retaining most of its accuracy.•The method is based on zone folding combined with a truncation of the Hamiltonian.•It reproduces band structures and density of states based on tight-binding theory.•It speeds up computations in parallel calculations and may have practical use.
Details
- Title: Subtitle
- Speeding up tight binding calculations using zone-folding methods
- Creators
- Tian-Xiang Liu - Wuhan UniversityMats-Erik Pistol - Lund UniversityCraig Pryor - University of IowaLi Mao - Wuhan University
- Resource Type
- Journal article
- Publication Details
- Computational materials science, Vol.211, p.111479
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.commatsci.2022.111479
- ISSN
- 0927-0256
- eISSN
- 1879-0801
- Language
- English
- Date published
- 08/01/2022
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428801302771
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