Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 27, Issue 49, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/27/49/495501
Keywords
DFT; embedding; Brillouin zone
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Funding
- National Science Foundation [1438493]
- Directorate For Engineering [1438493] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys [1438493] Funding Source: National Science Foundation
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In order to approximately satisfy the Bloch theorem, simulations of complex materials involving periodic systems are made n(k) times more complex by the need to sample the first Brillouin zone at n(k) points. By combining ideas from Kohn-Sham density-functional theory (DFT) and orbital-free DFT, for which no sampling is needed due to the absence of waves, subsystem DFT offers an interesting middle ground capable of sizable theoretical speedups against Kohn-Sham DFT. By splitting the supersystem into interacting subsystems, and mapping their quantum problem onto separate auxiliary Kohn-Sham systems, subsystem DFT allows an optimal topical sampling of the Brillouin zone. We elucidate this concept with two proof of principle simulations: a water bilayer on Pt[1 1 1]; and a complex system relevant to catalysis-a thiophene molecule physisorbed on a molybdenum sulfide monolayer deposited on top of an alpha-alumina support. For the latter system, a speedup of 300% is achieved against the subsystem DTF reference by using an optimized Brillouin zone sampling (600% against KS-DFT).
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