Orbital-selective Mott phase as a dehybridization fixed point

TL;DR

This paper proposes that the orbital-selective Mott phase (OSMP) in strongly correlated systems is a result of correlation-driven dehybridization, stabilized by a competition between inter-orbital hopping and spin correlations, supported by EDMFT and quantum Monte Carlo methods.

Contribution

It introduces the concept that OSMP is a dehybridization fixed point driven by correlations, providing a new theoretical perspective on orbital selectivity.

Findings

OSMP emerges as a stable dehybridization fixed point.

Demonstrates the stability of the OSMP.

Connects the mechanism to partial localization-delocalization transitions.

Abstract

Studies on the iron-based superconductors and related strongly correlated systems have focused attention on bad-metal normal state in proximity to antiferromagnetic order. An orbital-selective Mott phase (OSMP) has been extensively discussed as anchoring the orbital-selective correlation phenomena in this regime. Motivated by recent experiments, we advance the notion that an OSMP is synonymous to correlation-driven dehybridization. This idea is developed in terms of a competition between inter-orbital hopping and dynamical spatial spin correlations. Within effective models that arise from extended dynamical mean-field theory (EDMFT), and using a combination of continuous-time quantum Monte Carlo and analytical methods, we show how the OSMP emerges as a stable dehybridization fixed point. Concomitantly, the stability of the OSMP is demonstrated. Connections of this mechanism with partial localization-delocalization transition in other strongly correlated metals are discussed.