Efficient update of determinants for many-electron wave function overlaps

Computer Physics Communications(2021)

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摘要
The calculation of overlaps between many-electron wave functions at different nuclear geometries during nonadiabatic dynamics simulations requires the evaluation of a large number of determinants of matrices that differ only in a few rows/columns. While this calculation is fast for small systems, its cost grows faster than the alternative electronic structure calculation used to obtain the wave functions. For wave functions that can be written as a CIS expansion, all determinants can be computed using the set of level-2 minors of the reference matrix. However, this is still a costly computation for large systems.
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关键词
Nonadiabatic dynamics,Surface hopping,Determinant,LU factorization,High performance computing
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