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Showing 1 to 20 of 20 for “"Vanadium dioxide"”.
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Tunable spin-charge conversion in vanadium dioxide
Spin-based electronic devices rely on the interplay of spin and charge degree of freedom of electrons and are emerging as a promising beyond CMOS technology. Fast, scalable, low energy consumption magnetic memories and nonvolatile spin logic devices have been demonstrated utilizing …
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Phase Transition in Vanadium Dioxide Induced by Friction
"Le dioxyde de vanadium (VO₂) est un matériau avec une transition de phase qui se passe vers une température de 68°C. C'est un matériau important qui a fait l'objet de nombreuses études au cours des dernières décennies, et plusieurs applications ont été démontrées en optique. À ce jour, les études …
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Atomic Layer Deposition of Vanadium Dioxide: Synthesis, Doping, and Device Applications
Vanadium dioxide (VO₂) is a phase change material whose metal-insulator transition (MIT) has inspired a variety of applications. The MIT makes VO₂ useful for devices with improved switching performance and as the building block for alternative computing architectures such as oscillators and …
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Vanadium dioxide thermochromic thin films correlation between microstructure, electrical and optical properties
Thermochromic thin films of vanadium dioxide (VO2) were successfully prepared using two physical vapour deposition methods namely Pulsed Laser Deposition (PLD) and Inverted Cylindrical Magnetron Sputtering (ICMS). We used these two techniques in order to comparatively study the effect of deposition …
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Underlying Mechanisms of Halide Perovskites Properties and Metal Insulator Transitions in Vanadium Dioxide
… for efficient and stable perovskite solar cells. Vanadium dioxide (VO<sub>2</sub>) undergoes a metal-insulator transition (MIT) at 340K from its semiconducting monoclinic phase to the metallic rutile phase. In polycrystalline VO<sub>2</sub>, the MIT is less sharp due to grain boundaries (GBs). …
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Solid Phase Crystallization of Vanadium Dioxide Thin Films and Characterization Through Scanning Electron Microscopy
Crystalline films of vanadium dioxide were obtained through thermal annealing of amorphous vanadium dioxide thin films sputtered on silicon dioxide. An annealing process was found that yielded polycrystalline vanadium dioxide thin films, semi-continuous thin films, and films of isolated single-crystal …
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Contrôle spectral par pompage optique des couches minces de dioxide de vanadium (Spectral shaping with optically pumped vanadium dioxide thin films)
… l'utilisation des couches minces de dioxyde de vanadium (VO2) pour modifier le spectre d'un faisceau lumineux incident. Le VO2 est un matériau qui, lorsque chauffé à une certaine température critique, subit une transition de l'état isolant à l'état semiconducteur. Cette transition d'état est …
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Tailoring charge to spin conversion in novel materials for efficient spintronics
… strongly correlated electron compound vanadium dioxide (VO₂). We then show that by engineering the chemical order in the newly discovered magnetic Weyl semimetal (MWSM), Co₂MnGa, we can control the spin-charge conversion. Tailoring this interconversion efficiency will lead to …
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Nanoscale stress-induced conducting states in functional oxides
… and the metalinsulator transition oxide, Vanadium Dioxide.
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First principles quantum Monte Carlo study of correlated electronic systems
… correlations in transition metal oxides (vanadium dioxide) and low dimensional electronic systems (graphene and graphene-like two dimensional systems). Vanadium dioxide (VO2) is a paradigmatic example of a strongly correlated system that undergoes a metal-insulator transition at a …
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Control of Optical Processes in Diamond using Plasmonic Nanogap Cavities
… sub-10-nm films of the phase-change material vanadium dioxide. This platform opens up opportunities for on-chip quantum networks and nanoscale sensors based on nanocavity-coupled SiVs with the potential for in-situ frequency conversion to outcouple to photonic circuits and reconfigurable …
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Dynamic Materials and Devices for Controlling Solar Heat Gain in Buildings
… materials such as certain crystal phases of vanadium dioxide have been proposed for inclusion in opaque façade materials. In this paper we investigate the synthesis, integration, and performance of advanced materials for application in both dynamic insulating glass units (IGUs) and dynamic …
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Full spectrum utilization for high-efficiency solar energy conversion
… we investigated the radiation dynamics of vanadium dioxide (VO2 ), which is of interest because of the abrupt decline of emittance at the insulator-metal transition at ~340 K. Negative differential emission is exploited to demonstrate thermal runaway of this system for the first time. These …
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Developments and advances in nonlinear terahertz spectroscopy
… Probing of THz-driven structural changes in both vanadium dioxide and perovskite ferroelectrics is demonstrated using femtosecond Xray pulses from the LCLS facility at the SLAC National Accelerator Laboratory. Finally, ongoing results involving energetic materials, stimulated Raman measurements, …
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Nonlinear terahertz spectroscopy of electronic and vibrational responses in condensed matter systems
… metamaterial responses in gallium arsenide and vanadium dioxide. In GaAs, we have shown that metamaterial properties may be tuned by an intense THz field if the substrate material (GaAs) is changed by the incident THz pulse, and we have demonstrated carrier multiplication locally in the …
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A micromachined thermo-optical light modulator based on semiconductor-to-metal phase transition
… the semiconductor-to-metal phase transition of vanadium dioxide (VO_2) thin film. VO_2 undergoes a reversible phase transition at approximately 68 0C, which is accompanied with drastic changes in its electrical and optical properties. The sharp electrical resistivity change can be as great as …
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Advanced light manipulation and waveguiding in plasmonic nanostructured optical fibers.
… the study of optical modulation by incorporating vanadium dioxide (VO2) nanocrystals into the air holes of anti-resonant hollow-core photonic crystal fibers (ARHCF). Efficient optical modulation is observed by inducing the insulator-to-metal phase transition of VO2 at different temperatures.
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Electronic, thermoelectric and optical properties of vanadium oxides: VO2, V2O3 and V2O5
Correlated electrons in vanadium oxides are responsible for their extreme sensitivity to external stimuli such as pressure, temperature or doping. As a result, several vanadium oxides undergo insulator-to-metal phase transition (IMT) accompanied by structural change. Unlike vanadium pentoxide …
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Synthesis of Chemically Stable VO2 Particles Using Green Solvents and their Application as Smart Coatings
… Of the potential thermochromic materials, vanadium dioxide (VO2) is known to display a fully reversible semiconductor-metal transition (SMT). VO2 responds thermochromically to environmental temperature changes by changing its crystal structure as a function of temperature. VO2 is …
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Towards stimuli-responsive functional nanocomposites: smart tunable plasmonic nanostructures Au-VO2
The fascinating optical properties of metallic nanostructures, dominated by collective oscillations of free electrons known as plasmons, open new opportunities for the development of devices fabrication based on noble metal nanoparticle composite materials. This thesis demonstrates a low-cost and …