Semiconductor heterostructures¹ and ultracold neutral atomic lattices² capture many of the essential properties of one-dimensional electronic systems. However, fully one-dimensional superlattices are highly challenging to fabricate in the solid state due to the inherently small length scales involved. Conductive atomic force microscope lithography applied to an oxide interface can create ballistic few-mode electron waveguides with highly quantized conductance and strongly attractive electron–electron interactions³. Here we show that artificial Kronig–Penney-like superlattice potentials can be imposed on such waveguides, introducing a new superlattice spacing that can be made comparable to the mean separation between electrons. The imposed superlattice potential fractures the electronic subbands into a manifold of new subbands with magnetically tunable fractional conductance. The lowest plateau, associated with ballistic transport of spin-singlet electron pairs³, shows enhanced electron pairing, in some cases up to the highest magnetic fields explored. A one-dimensional model of the system suggests that an engineered spin–orbit interaction in the superlattice contributes to the enhanced pairing observed in the devices. These findings are an advance in the ability to design new families of quantum materials with emergent properties and the development of solid-state one-dimensional quantum simulation platforms.

半导体异质结构¹和超冷中性原子晶格²捕获了一维电子系统的许多基本特性。然而，由于所涉及的固有的小长度尺度，完全一维超晶格在固态下制造是极具挑战性的。应用于氧化物界面的导电原子力显微镜光刻可以创建具有高度量化电导和强吸引力电子-电子相互作用的弹道少模电子波导³. 在这里，我们展示了可以将人造 Kronig-Penney 类超晶格势施加在这种波导上，从而引入一种新的超晶格间距，该间距可以与电子之间的平均间距相媲美。施加的超晶格势将电子子带断裂成具有磁性可调谐分数电导的新子带的流形。与自旋单重态电子对^{3的弹道传输相关的最低平台}，显示增强的电子配对，在某些情况下达到探索的最高磁场。该系统的一维模型表明，超晶格中的工程自旋轨道相互作用有助于在器件中观察到增强的配对。这些发现是设计具有涌现特性的新量子材料家族的能力以及开发固态一维量子模拟平台的能力的进步。