First-principles study of Rashba effect in the (LaAlO3)2/(SrTiO3)2 |
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| Authors: | Miho Nishida Hiroki Kotaka Mineo Saito |
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| Affiliation: | 1. Division of Mathematical and Physical Science, Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan;2. Faculty of Mathematics and Physics, Institute of Science and Engineering, Kanazawa University, Kanazawa 920-1192, Japan |
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| Abstract: | We have performed first-principles density functional calculations for superlattice composed of two oxide insulators, (LaAlO3)2/(SrTiO3)2. Calculated band structures show interface-induced metallic states. We found electron doping in the TiO2 layer at LaO interface and hole doping in the AlO2 layer at SrO interface. Due to the built-in electric field at the interface, the interface states show spin splitting and vortex-like spin textures in momentum space, i.e. Rashba effect. Calculated Rashba coefficient αR, 12.6 meV Å, is of the same order as that of the experimental value. |
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| Keywords: | first-principles artificial superlattice Rashba effect |
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