The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Inar Alves De Castro - One of the best experts on this subject based on the ideXlab platform.
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effect of sinapic acid ester derivatives on the oxidative stability of omega 3 fatty acids rich oil in water emulsions
Food Chemistry, 2020Co-Authors: Tayse Ferreira Ferreira Da Silveira, Leticia Maeda Cajaiba, Leonardo Valentin, Bruno Barea, Pierre Villeneuve, Inar Alves De CastroAbstract:Oil-in-water (O/W) emulsions are important delivery systems of omega-3 fatty acids (n-3 FA). We investigated the effect of sinapic acid esters concentration and chain length, the Electrical Charge of the emulsifier and emulsion pH on the oxidative stability of n-3 FA rich O/W emulsions. Echium oil was applied as n-3 FA source. A 24 factorial design was used to simultaneously evaluate these factors. Peroxide value, malondialdehyde, 2,4-heptadienal and 2,4-decadienal were measured in the emulsions. pH and the Electrical Charge of the emulsifier modulated the antioxidant effectiveness of sinapic acid esters, while concentration was not relevant. The combination of positively Charged emulsifier with neutral pH provided the best oxidative stability for echium oil emulsions. Our results also suggested that the increase of length chain of sinapic acid, from C4 to C12, reduced the secondary products of oxidation, when echium oil emulsions were prepared using negatively Charged emulsifier under acidic conditions.
Sergej O. Demokritov - One of the best experts on this subject based on the ideXlab platform.
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excitation of coherent propagating spin waves by pure spin currents
Nature Communications, 2016Co-Authors: Vladislav E. Demidov, Sergei Urazhdin, Sergej O. Demokritov, R H Liu, B Divinskiy, A V TeleginAbstract:Utilization of pure spin currents not accompanied by the flow of Electrical Charge provides unprecedented opportunities for the emerging technologies based on the electron's spin degree of freedom, such as spintronics and magnonics. It was recently shown that pure spin currents can be used to excite coherent magnetization dynamics in magnetic nanostructures. However, because of the intrinsic nonlinear self-localization effects, magnetic auto-oscillations in the demonstrated devices were spatially confined, preventing their applications as sources of propagating spin waves in magnonic circuits using these waves as signal carriers. Here, we experimentally demonstrate efficient excitation and directional propagation of coherent spin waves generated by pure spin current. We show that this can be achieved by using the nonlocal spin injection mechanism, which enables flexible design of magnetic nanosystems and allows one to efficiently control their dynamic characteristics.
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spin current nano oscillator based on nonlocal spin injection
Scientific Reports, 2015Co-Authors: Vladislav E. Demidov, Sergei Urazhdin, Andrei Zholud, A V Sadovnikov, A N Slavin, Sergej O. DemokritovAbstract:Nonlocal spin injection has been recognized as an efficient mechanism for creation of pure spin currents not tied to the Electrical Charge transfer. Here we demonstrate experimentally that it can induce coherent magnetization dynamics, which can be utilized for the implementation of novel microwave nano-sources for spintronic and magnonic applications. We show that such sources exhibit a small oscillation linewidth and are tunable over a wide frequency range by the static magnetic field. Spatially resolved measurements of the dynamical magnetization indicate a relatively large oscillation area, resulting in a high stability of the oscillation with respect to thermal fluctuations. We propose a simple quasilinear dynamical model that reproduces well the oscillation characteristics.
Tayse Ferreira Ferreira Da Silveira - One of the best experts on this subject based on the ideXlab platform.
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effect of sinapic acid ester derivatives on the oxidative stability of omega 3 fatty acids rich oil in water emulsions
Food Chemistry, 2020Co-Authors: Tayse Ferreira Ferreira Da Silveira, Leticia Maeda Cajaiba, Leonardo Valentin, Bruno Barea, Pierre Villeneuve, Inar Alves De CastroAbstract:Oil-in-water (O/W) emulsions are important delivery systems of omega-3 fatty acids (n-3 FA). We investigated the effect of sinapic acid esters concentration and chain length, the Electrical Charge of the emulsifier and emulsion pH on the oxidative stability of n-3 FA rich O/W emulsions. Echium oil was applied as n-3 FA source. A 24 factorial design was used to simultaneously evaluate these factors. Peroxide value, malondialdehyde, 2,4-heptadienal and 2,4-decadienal were measured in the emulsions. pH and the Electrical Charge of the emulsifier modulated the antioxidant effectiveness of sinapic acid esters, while concentration was not relevant. The combination of positively Charged emulsifier with neutral pH provided the best oxidative stability for echium oil emulsions. Our results also suggested that the increase of length chain of sinapic acid, from C4 to C12, reduced the secondary products of oxidation, when echium oil emulsions were prepared using negatively Charged emulsifier under acidic conditions.
Jawad Ul Hassan - One of the best experts on this subject based on the ideXlab platform.
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Electrical Charge state manipulation of single silicon vacancies in a silicon carbide quantum optoelectronic device
Nano Letters, 2019Co-Authors: Matthias Widmann, Jawad Ul Hassan, Matthias Niethammer, Dmitry Yu Fedyanin, Igor A Khramtsov, Torsten Rendler, Ian Don Booker, Naoya Morioka, Yuchen Chen, Ivan Gueorguiev IvanovAbstract:Color centers with long-lived spins are established platforms for quantum sensing and quantum information applications. Color centers exist in different Charge states, each of them with distinct optical and spin properties. Application to quantum technology requires the capability to access and stabilize Charge states for each specific task. Here, we investigate Charge state manipulation of individual silicon vacancies in silicon carbide, a system which has recently shown a unique combination of long spin coherence time and ultrastable spin-selective optical transitions. In particular, we demonstrate Charge state switching through the bias applied to the color center in an integrated silicon carbide optoelectronic device. We show that the electronic environment defined by the doping profile and the distribution of other defects in the device plays a key role for Charge state control. Our experimental results and numerical modeling evidence that control of these complex interactions can, under certain conditions, enhance the photon emission rate. These findings open the way for deterministic control over the Charge state of spin-active color centers for quantum technology and provide novel techniques for monitoring doping profiles and voltage sensing in microscopic devices.
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stark tuning and Electrical Charge state control of single divacancies in silicon carbide
Applied Physics Letters, 2017Co-Authors: Charles F De Las Casas, David J Christle, Jawad Ul Hassan, Takeshi Ohshima, N T Son, D D AwschalomAbstract:Neutrally Charged divacancies in silicon carbide (SiC) are paramagnetic color centers whose long coherence times and near-telecom operating wavelengths make them promising for scalable quantum communication technologies compatible with existing fiber optic networks. However, local strain inhomogeneity can randomly perturb their optical transition frequencies, which degrades the indistinguishability of photons emitted from separate defects and hinders their coupling to optical cavities. Here, we show that electric fields can be used to tune the optical transition frequencies of single neutral divacancy defects in 4H-SiC over a range of several GHz via the DC Stark effect. The same technique can also control the Charge state of the defect on microsecond timescales, which we use to stabilize unstable or non-neutral divacancies into their neutral Charge state. Using fluorescence-based Charge state detection, we show that both 975 nm and 1130 nm excitation can prepare their neutral Charge state with near unity...
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stark tuning and Electrical Charge state control of single divacancies in silicon carbide
arXiv: Quantum Physics, 2017Co-Authors: Charles F De Las Casas, David J Christle, Jawad Ul Hassan, Takeshi Ohshima, N T Son, D D AwschalomAbstract:Neutrally Charged divacancies in silicon carbide (SiC) are paramagnetic color centers whose long coherence times and near-telecom operating wavelengths make them promising for scalable quantum communication technologies compatible with existing fiber optic networks. However, local strain inhomogeneity can randomly perturb their optical transition frequencies, which degrades the indistinguishability of photons emitted from separate defects, and hinders their coupling to optical cavities. Here we show that electric fields can be used to tune the optical transition frequencies of single neutral divacancy defects in 4H-SiC over a range of several GHz via the DC Stark effect. The same technique can also control the Charge state of the defect on microsecond timescales, which we use to stabilize unstable or non-neutral divacancies into their neutral Charge state. Using fluorescence-based Charge state detection, we show both 975 nm and 1130 nm excitation can prepare its neutral Charge state with near unity efficiency.
D D Awschalom - One of the best experts on this subject based on the ideXlab platform.
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stark tuning and Electrical Charge state control of single divacancies in silicon carbide
Applied Physics Letters, 2017Co-Authors: Charles F De Las Casas, David J Christle, Jawad Ul Hassan, Takeshi Ohshima, N T Son, D D AwschalomAbstract:Neutrally Charged divacancies in silicon carbide (SiC) are paramagnetic color centers whose long coherence times and near-telecom operating wavelengths make them promising for scalable quantum communication technologies compatible with existing fiber optic networks. However, local strain inhomogeneity can randomly perturb their optical transition frequencies, which degrades the indistinguishability of photons emitted from separate defects and hinders their coupling to optical cavities. Here, we show that electric fields can be used to tune the optical transition frequencies of single neutral divacancy defects in 4H-SiC over a range of several GHz via the DC Stark effect. The same technique can also control the Charge state of the defect on microsecond timescales, which we use to stabilize unstable or non-neutral divacancies into their neutral Charge state. Using fluorescence-based Charge state detection, we show that both 975 nm and 1130 nm excitation can prepare their neutral Charge state with near unity...
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stark tuning and Electrical Charge state control of single divacancies in silicon carbide
arXiv: Quantum Physics, 2017Co-Authors: Charles F De Las Casas, David J Christle, Jawad Ul Hassan, Takeshi Ohshima, N T Son, D D AwschalomAbstract:Neutrally Charged divacancies in silicon carbide (SiC) are paramagnetic color centers whose long coherence times and near-telecom operating wavelengths make them promising for scalable quantum communication technologies compatible with existing fiber optic networks. However, local strain inhomogeneity can randomly perturb their optical transition frequencies, which degrades the indistinguishability of photons emitted from separate defects, and hinders their coupling to optical cavities. Here we show that electric fields can be used to tune the optical transition frequencies of single neutral divacancy defects in 4H-SiC over a range of several GHz via the DC Stark effect. The same technique can also control the Charge state of the defect on microsecond timescales, which we use to stabilize unstable or non-neutral divacancies into their neutral Charge state. Using fluorescence-based Charge state detection, we show both 975 nm and 1130 nm excitation can prepare its neutral Charge state with near unity efficiency.