Tunable Collective Excitations in Epitaxial Perovskite NickelatesClick to copy article linkArticle link copied!
- Mengxia SunMengxia SunShanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai 200444, ChinaMore by Mengxia Sun
- Xu HeXu HeTheoretical Materials Physics, Q-MAT, CESAM, Université de Liège, B-4000 Liège, BelgiumMore by Xu He
- Mingyao ChenMingyao ChenShanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai 200444, ChinaMore by Mingyao Chen
- Chi Sin Tang*Chi Sin Tang*Email: [email protected]Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai 200444, ChinaSingapore Synchrotron Light Source, National University of Singapore, Singapore 117603, SingaporeMore by Chi Sin Tang
- Xiongfang LiuXiongfang LiuShanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai 200444, ChinaMore by Xiongfang Liu
- Liang DaiLiang DaiShanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai 200444, ChinaMore by Liang Dai
- Jishan LiuJishan LiuState Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, ChinaMore by Jishan Liu
- Zhigang ZengZhigang ZengShanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai 200444, ChinaMore by Zhigang Zeng
- Shuo SunShuo SunShanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai 200444, ChinaMore by Shuo Sun
- Mark B. H. BreeseMark B. H. BreeseSingapore Synchrotron Light Source, National University of Singapore, Singapore 117603, SingaporeDepartment of Physics, Faculty of Science, National University of Singapore, Singapore 117542, SingaporeMore by Mark B. H. Breese
- Chuanbing CaiChuanbing CaiShanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai 200444, ChinaMore by Chuanbing Cai
- Le Wang*Le Wang*Email: [email protected]Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by Le Wang
- Yingge DuYingge DuPhysical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United StatesMore by Yingge Du
- Andrew T. S. WeeAndrew T. S. WeeDepartment of Physics, Faculty of Science, National University of Singapore, Singapore 117542, SingaporeCentre for Advanced 2D Materials and Graphene Research, National University of Singapore, Singapore 117546, SingaporeMore by Andrew T. S. Wee
- Xinmao Yin*Xinmao Yin*Email: [email protected]Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai 200444, ChinaMore by Xinmao Yin
Abstract
The formation of plasmons through the collective excitation of charge density has generated intense discussions, offering insights into fundamental sciences and potential applications. While the underlying physical principles have been well-established, the effects of many-body interactions and orbital hybridization on plasmonic dynamics remain understudied. In this work, we present the observation of conventional metallic and correlated plasmons in epitaxial La1–xSrxNiO3 (LSNO) films with varying Sr doping concentrations (x = 0, 0.125, 0.25), unveiling their intriguing evolution. Unlike samples at other doping concentrations, the x = 0.125 intermediate doping sample does not exhibit the correlated plasmons despite showing high optical conductivity. Through a comprehensive experimental investigation using spectroscopic ellipsometry and X-ray absorption spectroscopy, the O2p-Ni3d orbital hybridization for LSNO with a doping concentration of x = 0.125 is found to be significantly enhanced, alongside a considerable weakening of its effective correlation U*. These factors account for the absence of correlated plasmons and the high optical conductivity observed in LSNO (0.125). Our results underscore the profound impact of orbital hybridization on the electronic structure and the formation of plasmons in strongly correlated systems. This in turn suggests that LSNO could serve as a promising alternative material in optoelectronic devices.
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