Please use this identifier to cite or link to this item: https://doi.org/10.1002/adma.202000153
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dc.titleInterfacial Oxygen-Driven Charge Localization and Plasmon Excitation in Unconventional Superconductors
dc.contributor.authorChi Sin Tang
dc.contributor.authorXinmao Yin
dc.contributor.authorShengwei Zeng
dc.contributor.authorJing Wu
dc.contributor.authorMing Yang
dc.contributor.authorPing Yang
dc.contributor.authorCaozheng Diao
dc.contributor.authorYuan Ping Feng
dc.contributor.authorMark B. H. Breese
dc.contributor.authorElbert E. M. Chia
dc.contributor.authorThirumalai Venkatesan
dc.contributor.authorManish Chhowalla
dc.contributor.authorAriando Ariando
dc.contributor.authorAndrivo Rusydi
dc.contributor.authorAndrew T. S. Wee
dc.date.accessioned2021-04-09T07:01:08Z
dc.date.available2021-04-09T07:01:08Z
dc.date.issued2020-07-09
dc.identifier.citationChi 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. https://doi.org/10.1002/adma.202000153
dc.identifier.issn15214095
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/189000
dc.description.abstractCharge 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.
dc.publisherWILEY
dc.subjectcharge localizations
dc.subjectinterfacial excitons
dc.subjectorbital hybridizations
dc.subjectplasmons
dc.subjectunconventional superconductors
dc.typeArticle
dc.contributor.departmentDEPT OF ELECTRICAL & COMPUTER ENGG
dc.contributor.departmentDEPT OF PHYSICS
dc.contributor.departmentSINGAPORE SYNCHROTRON LIGHT SOURCE
dc.description.doi10.1002/adma.202000153
dc.description.sourcetitleAdvanced Materials
dc.description.volume32
dc.description.issue34
dc.published.stateUnpublished
dc.grant.idNRF-CRP15-2015-01
dc.grant.fundingagencyNational Research Foundation
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