A coefficient average approximation towards Gutzwiller wavefunction formalism
نویسندگان
چکیده
منابع مشابه
Extended Gutzwiller wavefunction for the Hubbard-Holstein model
We introduce a new type of Gutzwiller variational wavefunction for correlated electrons coupled to phonons, able to treat on equal footing electronic and lattice degrees of freedom. We benchmark the wavefunction in the infinite-U Hubbard-Holstein model away from half-filling on a Bethe lattice, where we can directly compare with exact results by Dynamical Mean-Field Theory. For this model, we f...
متن کاملGutzwiller Approximation in Degenerate Hubbard Models
Degenerate Hubbard models are studied using the Generalized-GutzwillerApproximation. It is found that the metal-insulator transition occurs at a finite correlation Uc when the average number of electrons per lattice site is an integer. The critical Uc depends sensitively on both the band degeneracy N and the filling x. A derivation is presented for the general expression of Uc(x,N) which reprod...
متن کاملTime-dependent Gutzwiller approximation for the Hubbard model.
We develop a time-dependent Gutzwiller approximation (GA) for the Hubbard model analogous to the time-dependent Hartree-Fock (HF) method. This new formalism incorporates ground state correlations of the random phase approximation (RPA) type beyond the GA. Static quantities like ground state energy and double occupancy are in excellent agreement with exact results in one dimension up to moderate...
متن کاملTowards a Unified AI Formalism
have come to be called BDI architectures [8]. M~t work on BDI architectures hu as its underlying motivation the , . , need to exa.mine the feasibility of modeling practical rea.. ThaI paper p~lentl a unified approach to bul/d.. bo ded t [18 6] '" th t 8 , r I'. h .t t 0 ch I . BOnIng m resource un ~en s , . olo a e,lc.-. Ing .lnte Igent arc I ec U~I. ur approa ~ leI th chit tt t t . teg t ' I ,...
متن کاملRobust sample average approximation
Sample average approximation (SAA) is a widely popular approach to data-driven decisionmaking under uncertainty. Under mild assumptions, SAA is both tractable and enjoys strong asymptotic performance guarantees. Similar guarantees, however, do not typically hold in finite samples. In this paper, we propose a modification of SAA, which we term Robust SAA, which retains SAA’s tractability and asy...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Condensed Matter
سال: 2015
ISSN: 0953-8984,1361-648X
DOI: 10.1088/0953-8984/27/24/245604