Naslov
The Gutzwiller wave function as a disentanglement prescription

Autori
Sunko, Denis K.

Izvornik
European physical journal B : condensed matter physics (1434-6028) 42 (2004); 337-344

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Hubbard model; Strongly correlated electron systems; Metal-insulator transitions

Sažetak
The Gutzwiller variational wave function is shown to correspond to a particular disentanglement of the thermal evolution operator, and to be physically consistent only in the temperature range U << kT << E_F, the Fermi energy of the non-interacting system. The correspondence is established without using the Gutzwiller approximation. It provides a systematic procedure for extending the ansatz to the strong-coupling regime. This is carried out to infinite order in a dominant class of commutators. The calculation shows that the classical idea of suppressing double occupation is replaced at low temperatures by a quantum RVB-like condition, which involves phases at neighboring sites. Low-energy phenomenologies are discussed in the light of this result.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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