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Phys Rev Lett. 2018 Sep 14;121(11):116803. doi: 10.1103/PhysRevLett.121.116803.

High-Mobility Spin-Polarized Two-Dimensional Electron Gases at EuO/KTaO_{3} Interfaces.

Zhang H1,2, Yun Y3,4, Zhang X1,2, Zhang H1,2, Ma Y3,4, Yan X1,2, Wang F2,5, Li G1,2, Li R1,2, Khan T1,2, Chen Y1,2, Liu W2,5, Hu F1,2, Liu B1,2, Shen B1,2, Han W3,4, Sun J1,2.

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Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
International Centre for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China.
Collaborative Innovation Centre of Quantum Matter, Beijing 100871, People's Republic of China.
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China.


Two-dimensional electron gases (2DEGs) at oxide interfaces, which provide unique playgrounds for emergent phenomena, have attracted increasing attention in recent years. While most of the previous works focused on the 2DEGs at LaAlO_{3}/SrTiO_{3} interfaces, here we report on a new kind of 2DEGs formed between a magnetic insulator EuO and a high-k perovskite KTaO_{3}. The 2DEGs are not only highly conducting, with a maximal Hall mobility of 111.6  cm^{2}/V s at 2 K, but also well spin polarized, showing strongly hysteretic magnetoresistance up to 25 K and well-defined anomalous Hall effect up to 70 K. Moreover, unambiguous correspondences between the hysteretic behaviors of 2DEGs and the EuO layer are captured, suggesting the proximity effect of the latter on the former. This is confirmed by the results of density-functional theory calculations: Through interlayer exchange, EuO drives the neighboring TaO_{2} layer into a ferromagnetic state. The present work opens new avenues for the exploration for high performance spin-polarized 2DEGs at oxide interfaces.

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