The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Robert M Pick - One of the best experts on this subject based on the ideXlab platform.
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the prigogine defay ratio and the Microscopic Theory of supercooled liquids
Journal of Chemical Physics, 2008Co-Authors: Robert M PickAbstract:Prigogine–Defay ratios and, more recently, their frequency extension have been proposed to be a measure of the number of nonmacroscopic processes involved in the relaxation dynamics of supercooled liquids. We show that the Microscopic Theory of the Navier–Stokes equations of those liquids provides a consistent thermodynamic framework in which all possible dynamical Prigogine–Defay ratios can be expressed in terms of the same relaxation functions and that these ratios provide less information than the Microscopic Theory itself. The latter shows that more than one relaxation process is certainly always involved in this relaxation dynamics, whatever is the molecular dynamics, or experimental, technique used to determine the latter.
R. M. Pick - One of the best experts on this subject based on the ideXlab platform.
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The Prigogine–Defay ratio and the Microscopic Theory of supercooled liquids
Journal of Chemical Physics, 2008Co-Authors: R. M. PickAbstract:Prigogine–Defay ratios and, more recently, their frequency extension have been proposed to be a measure of the number of nonmacroscopic processes involved in the relaxation dynamics of supercooled liquids. We show that the Microscopic Theory of the Navier–Stokes equations of those liquids provides a consistent thermodynamic framework in which all possible dynamical Prigogine– Defay ratios can be expressed in terms of the same relaxation functions and that these ratios provide less information than the Microscopic Theory itself. The latter shows that more than one relaxation process is certainly always involved in this relaxation dynamics, whatever is the molecular dynamics, or experimental, technique used to determine the latter
M. Matsuo - One of the best experts on this subject based on the ideXlab platform.
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Microscopic Theory of spin Hall magnetoresistance
Physical Review B, 2020Co-Authors: Takeo Kato, Yuichi Ohnuma, M. MatsuoAbstract:We consider a Microscopic Theory for the spin Hall magnetoresistance (SMR). We generally formulate a spin conductance at an interface between a normal metal and a magnetic insulator in terms of spin susceptibilities. We reveal that SMR is composed of static and dynamic parts. The static part, which is almost independent of the temperature, originates from spin flip caused by an interfacial exchange coupling. However, the dynamic part, which is induced by the creation or annihilation of magnons, has an opposite sign from the static part. By the spin-wave approximation, we predict that the latter results in a nontrivial sign change in the SMR signal at a finite temperature. In addition, we derive the Onsager relation between spin conductance and thermal spin-current noise.
Zyun F. Ezawa - One of the best experts on this subject based on the ideXlab platform.
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Microscopic Theory of skyrmions in quantum Hall ferromagnets
Physical Review B, 2005Co-Authors: G. Tsitsishvili, Zyun F. EzawaAbstract:We present a Microscopic Theory of skyrmions in the monolayer quantum Hall ferromagnet. It is a peculiar feature of the system that the number density and the spin density are entangled intrinsically as dictated by the W{sub {infinity}} algebra. The skyrmion and antiskyrmion states are constructed as W{sub {infinity}}-rotated states of the hole-excited and electron-excited states, respectively. They are spin textures accompanied with density modulation that decreases the Coulomb energy. We calculate their excitation energy as a function of the Zeeman gap and compared the result with experimental data.
Takeo Kato - One of the best experts on this subject based on the ideXlab platform.
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Microscopic Theory of spin Hall magnetoresistance
Physical Review B, 2020Co-Authors: Takeo Kato, Yuichi Ohnuma, M. MatsuoAbstract:We consider a Microscopic Theory for the spin Hall magnetoresistance (SMR). We generally formulate a spin conductance at an interface between a normal metal and a magnetic insulator in terms of spin susceptibilities. We reveal that SMR is composed of static and dynamic parts. The static part, which is almost independent of the temperature, originates from spin flip caused by an interfacial exchange coupling. However, the dynamic part, which is induced by the creation or annihilation of magnons, has an opposite sign from the static part. By the spin-wave approximation, we predict that the latter results in a nontrivial sign change in the SMR signal at a finite temperature. In addition, we derive the Onsager relation between spin conductance and thermal spin-current noise.