Dirac-Like Fermions Anomalous Magneto-Transport in a Spin-Polarized Oxide 2D Electron System

IF 27.4 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Pub Date : 2024-10-30 DOI:10.1002/adma.202410354

Yu Chen, Maria D'Antuono, Mattia Trama, Daniele Preziosi, Benoit Jouault, Frédéric Teppe, Christophe Consejo, Carmine A. Perroni, Roberta Citro, Daniela Stornaiuolo, Marco Salluzzo

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Abstract

In a 2D electron system (2DES) the breaking of the inversion, time-reversal and bulk crystal-field symmetries is interlaced with the effects of spin-orbit coupling (SOC) triggering exotic quantum phenomena. Here, epitaxial engineering is used to design and realize a 2DES characterized simultaneously by ferromagnetic order, large Rashba SOC and hexagonal band warping at the (111) interfaces between LaAlO₃, EuTiO₃, and SrTiO₃ insulators. The 2DES displays anomalous quantum corrections to the magneto-conductance driven by the time-reversal-symmetry breaking occurring below the magnetic transition temperature. The results are explained by the emergence of a non-trivial Berry phase and competing weak anti-localization/weak localization back-scattering of Dirac-like fermions, mimicking the phenomenology of gapped topological insulators. These findings open perspectives for the engineering of novel spin-polarized functional 2DES holding promises in spin-orbitronics and topological electronics.

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自旋极化氧化物二维电子系统中的狄拉克费米子反常磁传输

在二维电子系统（2DES）中，反转、时间反转和体晶体场对称性的打破与自旋轨道耦合（SOC）效应交织在一起，引发了奇异的量子现象。在这里，我们利用外延工程设计并实现了一种 2DES ，其特点是在 LaAlO3、EuTiO3 和 SrTiO3 绝缘体之间的 (111) 接口处同时具有铁磁秩序、大 Rashba SOC 和六边形带翘曲。在磁转变温度以下发生的时间反向对称性断裂驱动下，2DES 显示出反常的磁导量子修正。这些结果可以通过模仿间隙拓扑绝缘体的现象学而出现的非三相贝里相和类狄拉克费米子的竞争性弱反局域化/弱局域化反向散射来解释。这些发现为新型自旋极化功能 2DES 的工程设计开辟了前景，为自旋轨道电子学和拓扑电子学带来了希望。

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来源期刊

Advanced Materials 工程技术-材料科学：综合

CiteScore

43.00

自引率

4.10%

发文量

2182

审稿时长

2 months

期刊介绍： Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.