Ferro-Orbitally Ordered Stripes in Systems with Alternating Orbital Order

TL;DR

This paper introduces a new mechanism for stripe formation in doped orbital-ordered systems, where ferro-orbitally ordered domain walls enable hole mobility and stability of solitonic stripes, advancing understanding of orbital degeneracy effects.

Contribution

It reveals a novel stripe formation mechanism involving ferro-orbital domain walls in systems with alternating orbital order, highlighting the role of orbital order in doped materials.

Findings

Ferro-orbitally ordered domain walls facilitate hole motion.

Stable solitonic stripes form at finite doping levels.

Phase change of orbital order has minor impact.

Abstract

We establish a novel mechanism of stripe formation in doped systems with alternating $t_{2g}$ orbital order --- the stripe takes the form of a ferro-orbitally ordered domain wall separating domains with staggered order and allowing for deconfined motion of holes along the stripe. At a finite level of hole concentration this gives rise to the stability of this solitonic type of stripes, while we show that the phase change of the staggered order by $\pi$ plays a minor role in orbitally ordered systems. These results shed new light on the physics of doped materials in which orbital degeneracy is present.