Article (Scientific journals)
Tunable Collective Excitations in Epitaxial Perovskite Nickelates
Sun, Mengxia; He, Xu; Chen, Mingyao et al.
2024In ACS Photonics, 11 (6), p. 2324 - 2334
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Keywords :
correlated plasmons; orbital hybridization; perovskite nickelates; spectroscopic ellipsometry; X-ray absorption spectroscopy; Collective excitations; Correlated plasmon; Doping concentration; Many-body interactions; Nickelates; Orbital hybridization; Perovskite nickelate; Physical principles; Tunables; Electronic, Optical and Magnetic Materials; Biotechnology; Atomic and Molecular Physics, and Optics; Electrical and Electronic Engineering
Abstract :
[en] 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.
Disciplines :
Physics
Author, co-author :
Sun, Mengxia ;  Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai, China
He, Xu  ;  Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Chen, Mingyao;  Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai, China
Tang, Chi Sin ;  Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai, China ; Singapore Synchrotron Light Source, National University of Singapore, Singapore, Singapore
Liu, Xiongfang;  Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai, China
Dai, Liang;  Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai, China
Liu, Jishan;  State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China
Zeng, Zhigang ;  Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai, China
Sun, Shuo ;  Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai, China
Breese, Mark B. H.;  Singapore Synchrotron Light Source, National University of Singapore, Singapore, Singapore ; Department of Physics, Faculty of Science, National University of Singapore, Singapore, Singapore
Cai, Chuanbing;  Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai, China
Wang, Le ;  Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, United States
Du, Yingge ;  Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, United States
Wee, Andrew T. S. ;  Department of Physics, Faculty of Science, National University of Singapore, Singapore, Singapore ; Centre for Advanced 2D Materials and Graphene Research, National University of Singapore, Singapore, Singapore
Yin, Xinmao ;  Shanghai Key Laboratory of High Temperature Superconductors, Institute for Quantum Science and Technology, Department of Physics, Shanghai University, Shanghai, China
More authors (5 more) Less
Language :
English
Title :
Tunable Collective Excitations in Epitaxial Perovskite Nickelates
Publication date :
19 June 2024
Journal title :
ACS Photonics
eISSN :
2330-4022
Publisher :
American Chemical Society (ACS)
Volume :
11
Issue :
6
Pages :
2324 - 2334
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
NUS - National University of Singapore
F.R.S.-FNRS - Fonds de la Recherche Scientifique
NSCF - National Natural Science Foundation of China
Chinese Academy of Sciences
Funding text :
This work was supported by the National Natural Science Foundation of China (Grant Nos. 52172271, 12374378, and 52307026), the National Key R&D Program of China (Grant No. 2022YFE03150200), Shanghai Science and Technology Innovation Program (Grant No. 22511100200 and 23511101600), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB25000000). X.H. acknowledges financial support from F.R.S. through the PDR Grants PROMOSPAN (T.0107.20). Work at PNNL was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Division of Materials Sciences and Engineering, Synthesis and Processing Science Program, under Award #10122. C.S.T. acknowledges the support from the NUS Emerging Scientist Fellowship.
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