One-dimensional (1D) quantum wires, which are functionalized by magnetic ad-atoms, can host ballistic helical transport. Helicity protects transport from an undesirable influence of material imperfections and makes the magnetically doped wire very promising elements for nanoelectronics and spintronics. However, fabricating purely 1D conductors is experimentally very challenging and not always feasible. In this paper, we show that the protected helical transport can exist even in quasi-1D wires. We model the quasi-1D magnetically doped wire as two coupled dense 1D Kondo chains. Each chain consists of itinerant electrons interacting with localized quantum magnetic moments - Kondo impurities. We have analyzed the regimes of weak-, intermediate- and strong inter-chain coupling and found conditions necessary for the origin of the aforementioned protected transport. Our results give a push for experimental realizations of the helical states in magnetically doped wires.

中文翻译：

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磁性掺杂量子线中受保护的螺旋传输：超越一维范式

由磁性原子作用的一维（1D）量子线可以承载弹道螺旋传输。螺旋保护了运输不受材料缺陷的不利影响，并使磁性掺杂的金属丝成为纳米电子和自旋电子学中非常有前途的元素。然而，制造纯一维导体在实验上非常具有挑战性，并不总是可行的。在本文中，我们表明即使在准一维导线中也可以存在受保护的螺旋传输。我们将准1D磁性掺杂线建模为两个耦合的密集1D近藤链。每条链由与局部量子磁矩（近藤杂质）相互作用的流动电子组成。我们已经分析了弱势，中间链和强链之间的耦合，以及发现上述受保护运输的必要条件。我们的结果推动了磁性掺杂导线中螺旋态的实验实现。