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Gutzwiller wave function

In the absence of the interaction U, the ground state is that of uncorrelated electrons j o) and has the form of a Slater determinant. As U is turned on, the weight of doubly occupied sites must be reduced because they cost an additional energy U per site. Accordingly, the trial Gutzwiller wave function (GWF) I/g) is built from the Hartree-like uncorraleted wave function (HWF) l/o),... [Pg.511]

There are at least three types of cluster expansions, perhaps the most conventional simply being based on an ordinary MO-based SCF solution, on a full space entailing both covalent and ionic structures. Though the wave-function has delocalized orbitals, the expansion is profitably made in a localized framework, at least if treating one of the VB models or one of the Hubbard/PPP models near the VB limit -and really such is the point of the so-called Gutzwiller Ansatz [52], The problem of matrix element evaluation for extended systems turns out to be somewhat challenging with many different ideas for their treatment [53], and a neat systematic approach is via Cizek s [54] coupled-cluster technique, which now has been quite successfully used making use [55] of the localized representation for the excitations. [Pg.412]

Quantized chaos, or quantum chaology (see Section 4.1), is about understanding the quantum spectra and wave functions of classically chaotic systems. The semiclassical method is one of the sharpest tools of quantum chaology. As discussed in Section 4.1.3 the central problem of computing the semiclassical spectrum of a classically chaotic system was solved by Gutzwiller more than 20 years ago. His trace formula (4.1.72) is the basis for all semiclassical work on the quantization of chaotic systems. [Pg.284]

By using the d-wave concept of Kotliar and liu (1988), a conventional (BCS-like) single-band singlet-pair wave function (BCS-hke) wiU be achieved when electron double occupancies are removed by applying the Gutzwiller method (Gutzwiller, 1963). [Pg.531]


See other pages where Gutzwiller wave function is mentioned: [Pg.549]    [Pg.552]    [Pg.549]    [Pg.552]    [Pg.133]    [Pg.509]    [Pg.519]    [Pg.191]    [Pg.41]    [Pg.191]    [Pg.212]    [Pg.237]   
See also in sourсe #XX -- [ Pg.511 , Pg.519 ]




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