Quantized Ballistic Transport of Electrons and Electron Pairs in LaAlO3/SrTiO3 Nanowires

摘要: SrTiO3-based heterointerfaces support quasi-two-dimensional (2D) electron systems that are analogous to III–V semiconductor heterostructures, but also possess superconducting, magnetic, spintronic, ferroelectric, and ferroelastic degrees of freedom. Despite these rich properties, the relatively low mobilities 2D complex-oxide interfaces appear preclude ballistic transport in 1D. Here we show LaAlO3/SrTiO3 interface can quantized electrons (nonsuperconducting) pairs within quasi-1D structures created using a well-established conductive atomic-force microscope (c-AFM) lithography technique. The nature ranges from truly single-mode (1D) three-dimensional (3D), depending on applied magnetic field gate voltage. Quantization lowest e2/h plateau indicate mean-free path lMF ∼ 20 μm, more than 2 orders magnitude larger for heterostructures. Nonsuperconducting are...