Spontaneous Spin Textures in Multiorbital Mott Systems

TL;DR

This paper demonstrates how electronic correlations can induce spontaneous spin textures in momentum space within multiorbital Mott systems, revealing new phases driven by doping a spin-triplet excitonic insulator.

Contribution

It introduces a novel mechanism for spin texture formation due to spontaneous symmetry breaking caused by electronic correlations in multiorbital Mott systems.

Findings

Doping a spin-triplet excitonic insulator creates new thermodynamic phases.

Electronic correlations can induce k-space spin textures without external spin-orbit coupling.

Analytic models support the numerical DMFT results.

Abstract

Spin textures in k-space arising from spin-orbit coupling in non-centrosymmetric crystals find numerous applications in spintronics. We present a mechanism that leads to appearance of k-space spin texture due to spontaneous symmetry breaking driven by electronic correlations. Using dynamical mean-field theory we show that doping a spin-triplet excitonic insulator provides a means of creating new thermodynamic phases with unique properties. The numerical results are interpreted using analytic calculations within a generalized double-exchange framework.