Cooper, Valentino R. Seo, Sung S. Ambrose Lee, Suyoun Kim, Jun Sung Choi, Woo Seok Okamoto, Satoshi Lee, Ho Nyung 2024-01-20T09:03:40Z 2024-01-20T09:03:40Z 2021-09-02 2014-08-11 2045-2322 https://pubs.kist.re.kr/handle/201004/126476 Metallic states appearing at interfaces between dissimilar insulating oxides exhibit intriguing phenomena such as superconductivity and magnetism. Despite tremendous progress in understanding their origins, very little is known about how to control the conduction pathways and the distribution of charge carriers. Using optical spectroscopic measurements and density-functional theory (DFT) simulations, we examine the effect of SrTiO3 (STO) spacer layer thickness on the optical transparency and carrier distribution in La delta-doped STO superlattices. We experimentally observe that these metallic superlattices remain highly transparent to visible light; a direct consequence of the appropriately large gap between the O 2p and Ti 3d states. In superlattices with relatively thin STO layers, we predict that three-dimensional conduction would occur due to appreciable overlap of quantum mechanical wavefunctions between neighboring delta-doped layers. These results highlight the potential for using oxide heterostructures in optoelectronic devices by providing a unique route for creating novel transparent conducting oxides. English NATURE PUBLISHING GROUP QUANTUM OSCILLATIONS ELECTRON-GAS MODULATION ABSORPTION INTERFACE SURFACE FILMS Transparent conducting oxides: A delta-doped superlattice approach Article 10.1038/srep06021 1 SCIENTIFIC REPORTS, v.4 SCIENTIFIC REPORTS 4 scie scopus 000340605200002 2-s2.0-84905918426 Multidisciplinary Sciences Science & Technology - Other Topics Article QUANTUM OSCILLATIONS ELECTRON-GAS MODULATION ABSORPTION INTERFACE SURFACE FILMS