Naslov
The Luttinger Sum Rule in the Slave-Particle Theories

Autori
Mrkonjić, Ivana ; Barišić, Slaven

Izvornik
The European Physical Journal B, section Solid and Condensed State Physics (1434-6028) 34 (2003), 4; 441-446

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

Ključne riječi
slave boson method; mean field approximation; Luttinger's sum rule; resonant band

Sažetak
The long-standing belief is that the usual mean field-like decoupling procedures applied to the slave-particle representations of the problems with strong local interaction violate Luttinger's sum rule for the single-particle propagator. The number of occupied resonant states is small and typically equal to the deviation from the sum rule, shedding doubt on the overall results. It is therefore argued and illustrated, on the example of the Emery model for the high-Tc superconductors, that, through the consistent application of the mean field procedure to the Hamiltonian and the propagators, the sum rule is restored and the resonant band conserved. In addition to the resonant band, the electron spectrum contains large number of occupied states at the bare site-energy of the ion with strong repulsion. These results can be straightforwardly generalized to other similar problems.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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