论文标题
多种二维电子气体
A multiferroic two-dimensional electron gas
论文作者
论文摘要
多效应是化合物，其中至少两个铁秩订单共存 - 通常（抗）铁磁性和铁电性。虽然在绝缘和导致化合物中都可以出现磁性，但在金属中原理不允许铁电性，尽管据报道几个二维（半）金属作为铁电的行为。然而，结合实现多效金属的磁性顺序仍然难以捉摸。在这里，通过结合X射线光谱和磁转运，我们显示了基于氧化物的二维电子气体（2DEG）中铁电和磁性的共存。数据证明了极化方向的极性位移和异常霍尔效应的非易失性切换，表明磁电耦合。我们的发现为量子问题提供了新的机会，这是由于铁电性，铁磁性和Rashba旋转轨道耦合之间的相互作用所引起的。
Multiferroics are compounds in which at least two ferroic orders coexist - typically (anti)ferromagnetism and ferroelectricity. While magnetic order can arise in both insulating and conducting compounds, ferroelectricity is in principle not allowed in metals although a few two-dimensional (semi)metals were reported to behave as ferroelectrics. Yet, the combination with magnetic order to realize multiferroic metals remains elusive. Here, by combining x-ray spectroscopy and magnetotransport, we show the coexistence of ferroelectricity and magnetism in an oxide-based two-dimensional electron gas (2DEG). The data evidence a non-volatile switching of the polar displacements and of the anomalous Hall effect by the polarization direction, demonstrating a magnetoelectric coupling. Our findings provide new opportunities in quantum matter stemming from the interplay between ferroelectricity, ferromagnetism and Rashba spin-orbit coupling in a 2DEG.
