Renormalized dispersing multiplets in the spectrum of nearly Mott localized systems

HALLBERG, KAREN; KOMIJANI, YASHAR; KOTLIAR, GABRIEL

PHYSICAL REVIEW B

APS

Año: 2019 vol. 99 p. 125150 - 125155

1098-0121

The spectrum of the strongly correlated systems usually shows resonant peaks at finite energy, with examples in the 115 Ce family which are reproduced by the dynamical mean-field theory. A similar structure has been seen recently in the orbitally selective Mott phase of the two-band model, known as the doublon-holon bound state, with implications for the fate of such phase in the zero Hund´s coupling limit. We show that these features can be captured with the slave-particle methods once their Hilbert space is taken into account. We use slave-spin calculations, justifiable in the limit of large dimensions, to explicitly demonstrate this and compare the results with dynamical mean-field theory.