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Title: Interfacial Oxygen-Driven Charge Localization and Plasmon Excitation in Unconventional Superconductors
Authors: Chi Sin Tang 
Xinmao Yin 
Shengwei Zeng 
Jing Wu
Ming Yang
Ping Yang 
Caozheng Diao 
Yuan Ping Feng 
Mark B. H. Breese 
Elbert E. M. Chia
Thirumalai Venkatesan 
Manish Chhowalla
Ariando Ariando 
Andrivo Rusydi 
Andrew T. S. Wee 
Keywords: charge localizations
interfacial excitons
orbital hybridizations
unconventional superconductors
Issue Date: 9-Jul-2020
Publisher: WILEY
Citation: Chi Sin Tang, Xinmao Yin, Shengwei Zeng, Jing Wu, Ming Yang, Ping Yang, Caozheng Diao, Yuan Ping Feng, Mark B. H. Breese, Elbert E. M. Chia, Thirumalai Venkatesan, Manish Chhowalla, Ariando Ariando, Andrivo Rusydi, Andrew T. S. Wee (2020-07-09). Interfacial Oxygen-Driven Charge Localization and Plasmon Excitation in Unconventional Superconductors. Advanced Materials 32 (34). ScholarBank@NUS Repository.
Abstract: Charge localization is critical to the control of charge dynamics in systems such as perovskite solar cells, organic-, and nanostructurebased photovoltaics. However, the precise control of charge localization via electronic transport or defect engineering is challenging due to the complexity in reaction pathways and environmental factors. Here, charge localization in optimal-doped La1.85Sr0.15CuO4 thin-film on SrTiO3 substrate (LSCO/STO) is investigated, and also a high-energy plasmon is observed. Charge localization manifests as a near-infrared mid-gap state in LSCO/STO. This is ascribed to the interfacial hybridization between the Ti3d-orbitals of the substrate and O2p-orbitals of the film. The interfacial effect leads to significant changes in the many-body correlations and local-field effect. The local-field effect results in an inhomogeneous charge distribution, and due to perturbation by an external field, the high polarizability of this nonuniform charge system eventually generates the high-energy plasmon. Transformation of the electronic correlations in LSCO/STO is further demonstrated via temperature-dependent spectral-weight transfer. This study of charge localization in cuprates and interfacial hybridization provides important clues to their electronic structures and superconductive properties.
Source Title: Advanced Materials
ISSN: 15214095
DOI: 10.1002/adma.202000153
Appears in Collections:Staff Publications

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