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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Mkhoyan, K. Andre
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2023Optical Properties of Electrochemically Gated La 1− xSr xCoO 3−δ as a Topotactic Phase-Change Materialcitations
- 2023Anomalous strain relaxation and its impact on the valence-driven spin-state/metal-insulator transition in epitaxial (Pr1−yYy)1−xCaxCoO3−δcitations
- 2023Spin Hall conductivity in Bi$_{1-x}$Sb$_x$ as an experimental test of bulk-boundary correspondence
- 2021Spin and Charge Interconversion in Dirac-Semimetal Thin Filmscitations
- 2020Layer Dependence of Dielectric Response and Water-Enhanced Ambient Degradation of Highly Anisotropic Black Ascitations
- 2020Ambipolar transport in van der Waals black arsenic field effect transistorscitations
- 2020Plasmonic nanocomposites of zinc oxide and titanium nitridecitations
- 2020Self-Assembled Periodic Nanostructures Using Martensitic Phase Transformationscitations
- 2020Thermal transport in ZnO nanocrystal networks synthesized by nonthermal plasmacitations
- 2018Room-temperature high spin–orbit torque due to quantum confinement in sputtered BixSe(1–x) filmscitations
- 2015Giant Spin Pumping and Inverse Spin Hall Effect in the Presence of Surface and Bulk Spin-Orbit Coupling of Topological Insulator Bi2Se3citations
- 2015Nonequilibrium-Plasma-Synthesized ZnO Nanocrystals with Plasmon Resonance Tunable via Al Doping and Quantum Confinementcitations
- 2015Hybrid molecular beam epitaxy for the growth of stoichiometric BaSnO3citations
- 2012Sputter deposition of semicrystalline tin dioxide filmscitations
- 2012Improving the damp-heat stability of copper indium gallium diselenide solar cells with a semicrystalline tin dioxide overlayercitations
- 2010Orientation and morphological evolution of catalyst nanoparticles during carbon nanotube growthcitations
- 2010Effect of hydrogen on catalyst nanoparticles in carbon nanotube growthcitations
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article
Optical Properties of Electrochemically Gated La 1− xSr xCoO 3−δ as a Topotactic Phase-Change Material
Abstract
<p>Materials with tunable infrared refractive index changes have enabled active metasurfaces for novel control of optical circuits, thermal radiation, and more. Ion-gel-gated epitaxial films of the perovskite cobaltite La<sub>1−</sub><sub>x</sub>Sr<sub>x</sub>CoO<sub>3−δ</sub> (LSCO) with 0.00 ≤ x ≤ 0.70 offer a new route to significant, voltage-tuned, nonvolatile refractive index modulation for infrared active metasurfaces, shown here through Kramers–Kronig-consistent dispersion models, structural and electronic transport characterization, and electromagnetic simulations before and after electrochemical reduction. As-grown perovskite films are high-index insulators for x < 0.18 but lossy metals for x > 0.18, due to a percolation insulator-metal transition. Positive-voltage gating of LSCO transistors with x > 0.18 reveals a metal-insulator transition from the metallic perovskite phase to a high-index (n > 2.5), low-loss insulating phase, accompanied by a perovskite to oxygen-vacancy-ordered brownmillerite transformation at high x. At x < 0.18, despite nominally insulating character, the LSCO films undergo remarkable refractive index changes to another lower-index, lower-loss insulating perovskite state with Δn > 0.6. In simulations of plasmonic metasurfaces, these metal-insulator and insulator-insulator transitions support significant, varied mid-infrared reflectance modulation, thus framing electrochemically gated LSCO as a diverse library of room-temperature phase-change materials for applications including dynamic thermal imaging, camouflage, and optical memories.</p>