压电型0.7 pbg1 / 3nb2 / 3o3 - 0.3 pbtio3衬底上LaAlO3/TiO2异质界面上二维电子气的新特性

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-02-19 DOI:10.1063/5.0256731

Hong Yan, Zhaoting Zhang, Zhi Shiuh Lim, Shengwei Zeng, Jijun Yun, Shuanhu Wang, Yupu Zhang, Kexin Jin

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引用次数: 0

摘要

理解和控制氧化物界面上出现的电子输运性质一直是凝聚态物理中基础科学和技术应用的主要问题。在这项工作中，我们报道了在压电型0.7PbMg1/3Nb2/3O3-0.3PbTiO3 （PMN-PT）衬底上非晶laalo3 /TiO2 （a- lao /TiO2）薄膜异质结构界面上形成的二维电子气体（2DEG），其中导电层约为2.48 nm。在50k以下观察到不同TiO2厚度的近藤行为。此外，独特的负磁阻（MR）和不对称的平面角磁阻暗示了Rashba自旋轨道相互作用的存在。此外，在a-LAO/TiO2/ PMN-PT异质结构中获得了电场控制的滞回线样电阻变化。在−1 kV/cm的电场下，室温下的电阻提高了~ 8%，这表明这种2DEG对TiO2层中的应变相当敏感。因此，这项工作为探索低维氧化物电子器件和非易失性存储器和逻辑器件的物理学开辟了一条道路。

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Emerging properties of the two-dimensional electron gas at LaAlO3/TiO2 heterointerfaces on piezoelectric 0.7PbMg1/3Nb2/3O3–0.3PbTiO3 substrates

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.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.