TY  - JOUR
AU  - Singer, Sanja
AU  - Di Napoli, Edoardo
AU  - Novaković, Vedran
AU  - Čaklović, Gayatri
TI  - The LAPW Method with Eigendecomposition Based on the Hari--Zimmermann Generalized Hyperbolic SVD
JO  - SIAM journal on scientific computing
VL  - 42
IS  - 5
SN  - 0196-5204
CY  - Philadelphia, Pa.
PB  - SIAM
M1  - FZJ-2019-04005
SP  - C265–C293
PY  - 2020
AB  - In this paper we propose an accurate, highly parallel algorithm for the generalized eigendecomposition of a matrix pair $(H, S)$, given in a factored form $(F^{\ast} J F, G^{\ast} G)$. Matrices $H$ and $S$ are generally complex and Hermitian, and $S$ is positive definite. These type of matrices emerge from the representation of the Hamiltonian of a quantum mechanical system in terms of an overcomplete set of basis functions. This expansion is part of a class of models within the broad field of Density Functional Theory, which is considered the golden standard in Condensed Matter Physics. The overall algorithm consists of four phases, the second and the fourth being optional, where the two last phases are computation of the generalized hyperbolic SVD of a complex matrix pair $(F,G)$, according to a given matrix $J$ defining the hyperbolic scalar product. If $J = I$, then these two phases compute the GSVD in parallel very accurately and efficiently.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000600650100021
DO  - DOI:10.1137/19M1277813
UR  - https://juser.fz-juelich.de/record/864105
ER  -