{While|Whilst|Although|Even though|When|Though} many-body wavefunction theory has {long|lengthy|extended} been established as a {powerful|potent|effective|strong|highly effective} framework for {highly|extremely|very|hugely} {accurate|correct|precise} molecular quantum chemistry, these {methods|techniques|strategies|approaches|procedures|solutions} have only {fairly|pretty|relatively} {recently|lately|not too long ago} been applied to extended systems {in a|inside a|within a} {significant|substantial|considerable|important} scale. {This is|This really is|This can be|That is} {due to the|because of the|as a result of} {high|higher} computational {cost|price|expense} of such calculations, requiring {efficient|effective} implementations and ample computing {resources|sources}. To {further|additional} aggravate this, second-order Møller-Plesset perturbation theory (MP2) ({the most|probably the most|essentially the most|one of the most|by far the most} {cost|price|expense} {effective|efficient|successful|powerful|productive|helpful} wavefuntion {method|technique|approach|strategy|system|process}) is {known|recognized|identified} to diverge or fail for some prototypical condensed matter systems {like the|just like the} homogeneous electron gas (HEG). {In this|Within this} paper, we {explore|discover} how the {issues|problems|concerns|troubles|difficulties|challenges} of MP2 for metallic and strongly correlated systems {can be|may be|could be|might be|is often|is usually} ameliorated {through|via|by means of|by way of} regularization. To this {end|finish}, two regularized second-order {methods|techniques|strategies|approaches|procedures|solutions} ({including|such as|which includes|like} {a new|a brand new}, size-extensive Brillioun-Wigner {approach|method|strategy}) are applied {to the|towards the|for the} HEG, the one-dimensional Hubbard model {and the|and also the|as well as the|along with the|plus the} graphene-water interaction {energy|power}. We {find|discover|locate|uncover|come across|obtain} that regularization {consistently|regularly} {leads to|results in} improvements {over|more than} the MP2 baseline and that {different|various|distinct|diverse|unique|distinctive} regularizers are {appropriate|suitable|proper|acceptable} for metallic and strongly correlated systems, respectively. 1-Bromo-3-methylnaphthalene Formula 3-Bromopiperidine-2,6-dione In stock PMID:24463635
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