Renormalized dispersing multiplets in the spectrum of nearly Mott localized systems

TL;DR

This paper investigates the spectral features of nearly Mott localized systems, revealing that slave-particle methods can effectively capture dispersing multiplets, aligning with dynamical mean-field theory results.

Contribution

It demonstrates that slave-spin methods, considering the full Hilbert space, can reproduce dispersing multiplet features seen in dynamical mean-field theory for strongly correlated systems.

Findings

Slave-spin calculations reproduce spectral resonances.

Features align with dynamical mean-field theory results.

Highlights importance of Hilbert space in spectral analysis.

Abstract

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 (OSM) phase of two-band model, known as doublon-holon bound state, with implications on 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.