# Transport in Magnetically Doped One-Dimensional Wires: Can the Helical Protection Emerge without the Global Helicity?

## TL;DR

This paper investigates a new phase in magnetically doped quantum wires where transport protection occurs without global helicity, expanding understanding of topological protection in one-dimensional systems.

## Contribution

It introduces the locally helical metal phase in doped quantum wires, demonstrating protection of transport without the need for global helicity, unlike previous models.

## Key findings

- Discovery of a locally helical metal phase with protected transport.
- Protection mechanism does not require breaking spin-rotation symmetry.
- Conditions for emergence and experimental tests discussed.

## Abstract

We study the phase diagram and transport properties of arbitrarily doped quantum wires functionalized by magnetic adatoms. The appropriate theoretical model for these systems is a dense one-dimensional Kondo Lattice (KL) which consists of itinerant electrons interacting with localized quantum magnetic moments. We discover the novel phase of the locally helical metal where transport is protected from a destructive influence of material imperfections. Paradoxically, such a protection emerges without a need of the global helicity, which is inherent in all previously studied helical systems and requires breaking the spin-rotation symmetry. We explain the physics of this protection of the new type, find conditions, under which it emerges, and discuss possible experimental tests. Our results pave the way to the straightforward realization of the protected ballistic transport in quantum wires made of various materials.