DataVXAdvanced MaterialsPaper
journal article·2020-08

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

Advanced Materials· Volume 32· Issue 34
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Source abstract

Abstract

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.
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Research context

NanomaterialsElectronic materials

OpenAlex topics: Physics of Superconductivity and Magnetism · Advanced Condensed Matter Physics · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics Faculty of Science National University of Singapore S12 Science Drive 3 Singapore 117551 Singapore

NUS Graduate School for Integrative Sciences and Engineering National University of Singapore 21 Lower Kent Ridge Singapore 119077 Singapore

Singapore Synchrotron Light Source National University of Singapore 5 Research Link Singapore 117603 Singapore

NUSNNI‐NanoCore National University of Singapore Singapore 117411 Singapore

Institute of Materials Research and Engineering A∗STAR (Agency for Science, Technology and Research) 2 Fusionopolis Way Singapore 138634 Singapore

Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore

Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore

Department of Materials Science & Metallurgy University of Cambridge Cambridge CB3 0FS UK

Centre for Advanced 2D Materials and Graphene Research Centre National University of Singapore Singapore 117546 Singapore

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