Interfacial Oxygen-Driven Charge Localization and Plasmon Excitation in Unconventional Superconductors

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

Research output: Contribution to journalArticlepeer-review

Abstract

Charge localization is critical to the control of charge dynamics in systems such as perovskite solar cells, organic-, and nanostructure-based 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.

Original languageEnglish
Article number2000153
JournalAdvanced Materials
Volume32
Issue number34
DOIs
Publication statusPublished - Aug 1 2020

Keywords

  • charge localizations
  • interfacial excitons
  • orbital hybridizations
  • plasmons
  • unconventional superconductors

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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