Itinerant spin polaron and metallic ferromagnetism in semiconductor moir\'e superlattices

TL;DR

This paper predicts the emergence of itinerant spin polarons and metallic ferromagnetism in doped semiconductor moiré superlattices, providing theoretical insights into their magnetic and electronic properties.

Contribution

It introduces a theoretical framework for understanding spin polarons and ferromagnetism in doped moiré superlattices, highlighting their dependence on doping levels.

Findings

Spin polarons can be identified via kinks in charge gap versus magnetic field.

Metallic ferromagnetism occurs in doped Mott insulators of moiré superlattices.

Theoretical prediction of magnetic phenomena in semiconductor moiré systems.

Abstract

Itinerant spin polaron and metallic ferromagnetism are theoretically predicted in the Mott insulator in semiconductor moir\'e superlattices doped below and above half filling of the narrow moir\'e band, respectively. The existence of spin polaron can be directly identified from the kink in the dependence of the charge gap on the magnetic field.