Overlapping fragments method for electronic structure calculation of large systems

Details Overlapping fragments method for electronic structure calculation of large systems Overlapping fragments method for electronic structure calculation of large systems

2010-11-22

arxiv.org/abs/1011.4764v2

J. Chem. Phys. 134, 094119 (2011)

Physics

Condensed Matter

Materials Science

9 pages, 10 figures, the version accepted in J. Chem. Phys

Scientific paper

10.1063/1.3560956

We present a method for the calculation of electronic structure of systems that contain tens of thousands of atoms. The method is based on the division of the system into mutually overlapping fragments and the representation of the single-particle Hamiltonian in the basis of eigenstates of these fragments. In practice, for the range of system size that we studied (up to tens of thousands of atoms), {the dominant part of the calculation scales} linearly with the size of the system when all the states within a fixed energy interval are required. The method is highly suitable for making good use of parallel computing architectures. We illustrate the method by applying it to diagonalize the single-particle Hamiltonian obtained using the density functional theory based charge patching method in the case of amorphous alkane and polythiophene polymers.

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