Affiliation:
1. Laboratoire de Physique des Solides CNRS Université Paris‐Saclay Orsay 91405 France
2. Synchrotron SOLEIL L'Orme des Merisiers Saint‐Aubin, Boîte Postale 48 Gif‐sur‐Yvette F‐91192 France
3. LSI CNRS CEA/DRF/IRAMIS École Polytechnique Institut Polytechnique de Paris Palaiseau F‐91120 France
4. European Theoretical Spectroscopy Facility (ETSF)
Abstract
AbstractCorrelated metals, such as SrVO3 (SVO) or SrNbO3, are promising materials for optical devices such as transparent conductors. Here, a real‐space and reciprocal‐space electron‐energy‐loss‐spectroscopy (EELS) investigation of SVO bulk and nanostructures is reported. An intense 1.35 eV excitation with a weak energy dispersion is observed in the loss function and is attributed to a bulk plasmonic excitation from the 3d‐t2g orbitals. Ab initio calculations done within a time‐dependent density functional theory framework reveal that a 1.5 band renormalization is sufficient to reproduce quantitatively this d–d plasmon energy and dispersion. The corresponding localized surface plasmon (LSP) peaks are measured by EELS on various nanostructures and are compared to finite‐difference time‐domain simulations. These LSPs exhibit quality factors above canonical materials (e.g., indium tin oxide) in the near‐infrared regime, demonstrating that SVO is also a material of high interest for plasmonic applications. Finally, by phasing out the surface plasmon contribution with EELS collected at minute off‐dipolar conditions, the bulk‐type plasmonic values are retrieved with nanometrical resolution. Core–shelled electronic structures are then observed for nanorods designed by focused ion beam (FIB), revealing a bandgap opening due to FIB damage. It is envisioned that similar bulk measurement can be feasible for most of the transition metal oxide nanostructures.
Funder
Grand Équipement National De Calcul Intensif
Agence Nationale de la Recherche
Horizon 2020 Framework Programme
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
2 articles.
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