Electron correlation and magnetism at the LaAlO_3/SrTiO_3 interface: A DFT+DMFT investigation

Frank Lechermann; Lewin Boehnke; Daniel Grieger; Christoph Piefke

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Electron correlation and magnetism at the LaAlO_3/SrTiO_3 interface: A DFT+DMFT investigation

机译：LaAlO_3 / SrTiO_3界面处的电子相关性和磁性：DFT + DMFT研究

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We shed light on the interplay between structure and many-body effects relevant for itinerant ferromagnetism in LaAlO_3/SrTiO_3 heterostructures. The realistic correlated electronic structure is studied by means of the (spin-polarized) charge self-consistent combination of density-functional theory with dynamical mean-field theory beyond the realm of static correlation effects. Though many-body behavior is also active in the defect-free interface, a ferromagnetic instability occurs only with oxygen vacancies. A minimal Ti two-orbital e_g-t_(2g) description for the correlated subspace is derived. Magnetic order affected by quantum fluctuations builds up from effective double exchange between modified nearly localized e_g and mobile xy electrons.

机译：我们阐明了LaAlO_3 / SrTiO_3异质结构中结构与多体铁磁性相关的多体效应之间的相互作用。通过密度泛函理论与动态平均场理论的（自旋极化）电荷自洽组合，研究了静态相关电子结构，超出了静态相关效应的范畴。尽管多体行为在无缺陷界面中也很活跃，但仅在氧空位的情况下才会发生铁磁不稳定性。得出了相关子空间的最小Ti两轨道e_g-t_（2g）描述。受量子涨落影响的磁阶是由修饰的近局部e_g电子和可移动xy电子之间的有效双交换建立的。

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来源
《Physical review》 |2014年第8期|085125.1-085125.7|共7页
作者
Frank Lechermann; Lewin Boehnke; Daniel Grieger; Christoph Piefke;
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作者单位

I. Institut fuer Theoretische Physik, Universitaet Hamburg, D-20355 Hamburg, Germany;

I. Institut fuer Theoretische Physik, Universitaet Hamburg, D-20355 Hamburg, Germany;

International School for Advanced Studies (SISSA), Via Bonomea 265, I-34136 Trieste, Italy;

I. Institut fuer Theoretische Physik, Universitaet Hamburg, D-20355 Hamburg, Germany;

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正文语种 eng
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关键词
electron states at surfaces and interfaces; strongly correlated electron systems; heavy fermions; level splitting and interactions;

机译：表面和界面的电子态;强相关电子系统;重费米子级别划分和互动;

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1. Band inversion driven by electronic correlations at the (111) LaAlO_3/SrTiO_3 interface [J] . Monteiro A. M. R. V. L., Vivek M., Groenendijk D. J., Physical review . 2019,第20期

机译：由（111）LaAlO_3 / SrTiO_3界面的电子相关性驱动的带反转
2. Band inversion driven by electronic correlations at the (111) LaAlO_3/SrTiO_3 interface [J] . Monteiro A. M. R. V. L., Vivek M., Groenendijk D. J., Physical review . 2019,第20期

机译：在（111）LAALO_3 / SRTIO_3接口的电子相关频段反演
3. Origin of Interface Magnetism in BiMnO_3/SrTiO_3 and LaAlO_3/SrTiO_3 Heterostructures [J] . M. Salluzzo, S. Gariglio, D. Stomaiuolo, Physical review letters . 2013,第8期

机译：BiMnO_3 / SrTiO_3和LaAlO_3 / SrTiO_3异质结构中界面磁性的起源
4. Two-Dimensional Electron Gas at the N-type Interface of the LaAlO_3/SrTiO_3 Hetero-Structure:A First Principle Study [C] . N T Trang, T V Nam, P B Duy, International Workshop on Theoretical and Computational Physics . 2014

机译：Laalo_3 / SRTIO_3异质结构的N型界面处的二维电子气体：第一个原理研究
5. Thermodynamics investigation of doping and correlation between magnetism and superconductivity in IronArsenic-based superconductors. [D] . Wei, Fengyan. 2011

机译：IronArsenic基超导体中掺杂与磁和超导之间的相关性的热力学研究。
6. Strong correlations elucidate the electronic structure and phase diagram of LaAlO3/SrTiO3 interface [O] . E. Maniv, M. Ben Shalom, A. Ron, -1

机译：强大的相关性阐明了LaAlO3 / SrTiO3界面的电子结构和相图
7. Electron correlation and magnetism at the LaAlO$_3$ /SrTiO$_3$ interface: A DFT+DMFT investigation [O] . Lechermann, Frank, Boehnke, Lewin, Grieger, Daniel, 2014

机译：LaAlO $ _3 $ / SrTiO $ _3 $界面的电子相关性和磁性：DFT + DMFT研究

Electron correlation and magnetism at the LaAlO_3/SrTiO_3 interface: A DFT+DMFT investigation

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