title: Nonlocal Spin Diffusion Driven by Giant Spin Hall Effect at Oxide Heterointerfaces.
abstract: A two-dimensional electron gas emerged at a LaAlO3/SrTiO3interface is an ideal system for "spin-orbitronics" as the structure itself strongly couple the spin and orbital degree of freedom through the Rashba spin-orbit interaction. One of core experiments toward this direction is the nonlocal spin transport measurement, which has remained elusive due to the low spin injection efficiency to this system. Here we bypass the problem by generating a spin current not through the spin injection from outside but instead through the inherent spin Hall effect and demonstrate the nonlocal spin transport. The analysis on the nonlocal spin voltage, confirmed by the signature of a Larmor spin precession and its length dependence, displays that both D'yakonov-Perel' and Elliott-Yafet mechanisms involve in the spin relaxation at low temperature. Our results show that the oxide heterointerface is highly efficient in spin-charge conversion with exceptionally strong spin Hall coefficient γ ∼ 0.15 ± 0.05 and could be an outstanding platform for the study of coupled charge and spin transport phenomena and their electronic applications.
authors.affiliation: School of Materials Science and Engineering-Low dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology , Ulsan, 44919, Korea.
authors.forename: Mi-Jin
authors.initials: MJ
authors.lastname: Jin
authors.affiliation: Center for Electronic Materials, Korea Institute of Science and Technology , Seoul 02792, Korea.
authors.forename: Seon Young
authors.initials: SY
authors.lastname: Moon
authors.affiliation: School of Materials Science and Engineering-Low dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology , Ulsan, 44919, Korea.
authors.forename: Jungmin
authors.initials: J
authors.lastname: Park
authors.affiliation: School of Materials Science and Engineering-Low dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology , Ulsan, 44919, Korea.
authors.forename: Vijayakumar
authors.initials: V
authors.lastname: Modepalli
authors.affiliation: School of Materials Science and Engineering-Low dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology , Ulsan, 44919, Korea.
authors.forename: Junhyeon
authors.initials: J
authors.lastname: Jo
authors.affiliation: Center for Electronic Materials, Korea Institute of Science and Technology , Seoul 02792, Korea.|Department of Nanomaterials Science and Technology, Korea University of Science and Technology , Daejeon, 34113, Korea.
authors.forename: Shin-Ik
authors.initials: SI
authors.lastname: Kim
authors.affiliation: Center for Spintronics, Korea Institute of Science and Technology , Seoul 02792, Korea.|KU-KIST Graduate School of Converging Science and Technology, Korea University , Seoul, 02481, Korea.
authors.forename: Hyun Cheol
authors.identifier: 0000-0001-5044-1355
authors.initials: HC
authors.lastname: Koo
authors.affiliation: Department of Nanomaterials Science and Technology, Korea University of Science and Technology , Daejeon, 34113, Korea.|Center for Spintronics, Korea Institute of Science and Technology , Seoul 02792, Korea.
authors.forename: Byoung-Chul
authors.identifier: 0000-0001-8215-3286
authors.initials: BC
authors.lastname: Min
authors.affiliation: PCTP and Department of Physics, Pohang University of Science and Technology , Pohang 37673, Korea.
authors.forename: Hyun-Woo
authors.initials: HW
authors.lastname: Lee
authors.affiliation: Center for Electronic Materials, Korea Institute of Science and Technology , Seoul 02792, Korea.|Department of Nanomaterials Science and Technology, Korea University of Science and Technology , Daejeon, 34113, Korea.
authors.forename: Seung-Hyub
authors.initials: SH
authors.lastname: Baek
authors.affiliation: School of Materials Science and Engineering-Low dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology , Ulsan, 44919, Korea.
authors.forename: Jung-Woo
authors.identifier: 0000-0001-7038-4001
authors.initials: JW
authors.lastname: Yoo
keywords: Oxide heterointerface; Rashba spin−orbit interaction; Spin Hall effect; nonlocal spin diffusion; spin−orbitronics