Briggeman Megan, Li Jianan, Huang Mengchen, Lee Hyungwoo, Lee Jung-Woo, Eom Kitae, Eom Chang-Beom, Irvin Patrick, Levy Jeremy
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA.
Pittsburgh Quantum Institute, Pittsburgh, PA 15260, USA.
Sci Adv. 2020 Nov 25;6(48). doi: 10.1126/sciadv.aba6337. Print 2020 Nov.
The quest to understand, design, and synthesize new forms of quantum matter guides much of contemporary research in condensed matter physics. One-dimensional (1D) electronic systems form the basis for some of the most interesting and exotic phases of quantum matter. Here, we describe a family of quasi-1D nanostructures, based on LaAlO/SrTiO electron waveguides, in which a sinusoidal transverse spatial modulation is imposed. These devices display unique dispersive features in the subband spectra, namely, a sizeable shift (∼7 T) in the spin-dependent subband minima, and fractional conductance plateaus. The first property can be understood as an engineered spin-orbit interaction associated with the periodic acceleration of electrons as they undulate through the nanowire (ballistically), while the second property signifies the presence of enhanced electron-electron scattering in this system. The ability to engineer these interactions in quantum wires contributes to the tool set of a 1D solid-state quantum simulation platform.
对理解、设计和合成新型量子物质的探索引领了凝聚态物理领域的许多当代研究。一维（1D）电子系统构成了一些最有趣和奇特的量子物质相的基础。在此，我们描述了一族基于LaAlO/SrTiO电子波导的准一维纳米结构，其中施加了正弦横向空间调制。这些器件在子带光谱中展现出独特的色散特性，即自旋相关子带极小值处有相当大的偏移（约7 T）以及分数电导平台。第一个特性可理解为与电子在纳米线中弹道式起伏时的周期性加速相关的工程化自旋 - 轨道相互作用，而第二个特性表明该系统中存在增强的电子 - 电子散射。在量子线中设计这些相互作用的能力有助于一维固态量子模拟平台的工具集。
