论文标题
铁磁Eutio $ _ {3} $（001）的（001）表面（001）表面的二维电子气
A two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO$_{3}$(001)
论文作者
论文摘要
氧化物准二维电子气体（Q2DEG）的研究一直是发现新颖的，有时是意外现象的操场，例如报告的磁性在表面上的磁性以及Laalo $ _ {3} $ {3} $和SRTIO $ _ {3} $ _ {3} $非磁性材料之间的界面。但是，该系统中的磁性很弱，并且有没有内在起源的证据。在这里，通过使用原位高分辨率角度分辨光发射，我们证明了批量的srtio $ _ {3} $的铁磁Eutio $ _ {3} $，在其（001）表面托管Q2DEG。这是通过在各种构型中存在氧气分裂的情况下用哈伯u术语的密度功能理论计算来证实的，所有这些都会导致与欧盟4F磁矩的铁磁顺序相关的自旋偏振Q2DEG。结果表明Eutio $ _ {3} $（001）是氧化物Q2DEGS的新材料平台，其特征是反转和时间反向对称性。
Studies on oxide quasi-two dimensional electron gas (q2DEG) have been a playground for the discovery of novel and sometimes unexpected phenomena, like the reported magnetism at the surface and at the interface between LaAlO$_{3}$ and SrTiO$_{3}$ non-magnetic materials. However, magnetism in this system is weak and there are evidences of a not intrinsic origin. Here, by using in-situ high-resolution angle resolved photoemission we demonstrate that ferromagnetic EuTiO$_{3}$, the magnetic counterpart of SrTiO$_{3}$ in the bulk, hosts a q2DEG at its (001) surface. This is confirmed by density functional theory calculations with Hubbard U terms in the presence of oxygen divacancies in various configurations, all of them leading to a spin-polarized q2DEG related to the ferromagnetic order of Eu-4f magnetic moments. The results suggest EuTiO$_{3}$(001) as a new material platform for oxide q2DEGs, characterized by broken inversion and time reversal symmetries.
