Emerging properties of the two-dimensional electron gas at LaAlO3/TiO2 heterointerfaces on piezoelectric 0.7PbMg1/3Nb2/3O3–0.3PbTiO3 substrates
Abstract
Understanding and controlling the emergent electronic transport properties at interfaces of oxides has been a major issue in condensed matter physics for both fundamental science and technological applications. In this work, we report a two-dimensional electron gas (2DEG) formed at the interfaces of amorphous-LaAlO3/TiO2 (a-LAO/TiO2) thin film heterostructures on piezoelectric 0.7PbMg1/3Nb2/3O3–0.3PbTiO3 (PMN–PT) substrates, where the conductive layer is about 2.48 nm. The Kondo behaviors below 50 K are observed depending on TiO2 thickness. In addition, unique negative magnetoresistance (MR) and asymmetry planar angular MR imply the presence of Rashba spin–orbit interactions. Furthermore, the electric-field-controlled hysteresis loop-like resistance changes were obtained in a-LAO/TiO2/PMN–PT heterostructures. A resistance enhancement of ∼8% at room temperature was achieved at an electric field of −1 kV/cm, which indicates that such 2DEG is rather sensitive to the strain in the TiO2 layer. Thus, this work creates a path to exploring the physics of low-dimensional oxide electronics and nonvolatile memory and logic devices.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (8)
Hong Yan
State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry
Zhaoting Zhang
Shaanxi Key Laboratory of Condensed Matter Structures and Properties & MOE Key Laboratory of Materials Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University 1 , Xi'an 710072,
Zhi Shiuh Lim
Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR) 1 , 2 Fusionopolis Way, Innovis #08–03, Singapore 138634,
Shengwei Zeng
Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR) 3 , 2 Fusionopolis Way, Innovis #08-03, Singapore 138634,
Jijun Yun
Shaanxi Key Laboratory of Condensed Matter Structures and Properties & MOE Key Laboratory of Materials Physics and Chemistry Under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University 1 , Xi'an 710072,
Shuanhu Wang
Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University 2 , Xi'an, Shaanxi 710072,
Yupu Zhang
Kexin Jin
Research & Development Institute of Northwestern Polytechnical University in Shenzhen 1 , Shenzhen 518063,