نتایج جستجو برای: metal correlations
تعداد نتایج: 311244 فیلتر نتایج به سال:
We study the evolution with pressure P and band filling y of the heat capacity, Hall coefficient, and resistivity at the approach to the T~O Mott-Hubbard metal-insulator transition (MIT) in highly correlated V2 ~03. Under P, the electronic effective mass m diverges at the MIT with a negligible change in carrier concentration n away from half-filling. Conversely, in the doped system m actually d...
The dynamics of electrons and atoms interacting with intense and ultrashort optical pulses presents an important problem in physics that cuts across different materials such as semiconductors and metals. The currently available laser pulses, as short as 5 fs, provide a time resolution shorter than the dephasing and relaxation times in many materials. This allows for a systematic study of many–b...
We study the effect of Coulomb correlations on the ultrafast optical dynamics of small metal particles. We demonstrate that a surface-induced dynamical screening of the electron-electron interactions leads to quasiparticle scattering with collective surface excitations. In noble-metal nanoparticles, it results in an interband resonant scattering of d-holes with surface plasmons. We show that th...
I. Leonov,1 A. N. Yaresko,2 V. N. Antonov,3 J. P. Attfield,4 and V. I. Anisimov5 1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute for Physics, University of Augsburg, Germany 2Max-Planck Institute for the Physics of Complex Systems, Dresden, Germany 3Institute of Metal Physics, Vernadskii Street, 03142 Kiev, Ukraine 4Centre for Science at Extreme Conditions,...
Near a Mott transition, strong electron correlations may enhance Cooper pairing. This is demonstrated in the dynamical mean field theory solution of a twofold-orbital degenerate Hubbard model with an inverted on-site Hund rule exchange, favoring local spin-singlet configurations. Close to the Mott insulator (which here is a local version of a valence bond insulator) a pseudogap non-Fermi-liquid...
Studies of low-frequency resistance noise show that the glassy freezing of the two-dimensional (2D) electron system in the vicinity of the metal-insulator transition occurs in all Si inversion layers. The size of the metallic glass phase, which separates the 2D metal and the (glassy) insulator, depends strongly on disorder, becoming extremely small in high-mobility samples. The behavior of the ...
BACKGROUND In Spain, few studies have evaluated prenatal exposure to heavy metals. The objective of this study was to describe lead, mercury and cadmium concentrations in blood from a sample of newborn-mother-father trios, as well as to investigate the association between metals in cord blood and parental variables. We also explored the relationship between cord blood metal concentrations and c...
We are studying quantum interference (coherence) and electron-electron interaction (correlations) over a wide range of spatial scales, from nm to mm. The interplay of correlations and coherence is one of the deepest topics in current chemistry and physics – it plays a critical role, for instance, in the 2D metal-insulator transition, interaction corrections in mesoscopic systems, and efforts to...
The effect of disorder on transport and magnetization in ferromagnetic III-V semiconductors, in particular (Ga,Mn)As, is studied theoretically. We show that Coulomb-induced correlations of the defect positions are crucial for the transport and magnetic properties of these highly compensated materials. We employ Monte Carlo simulations to obtain the correlated defect distributions. Exact diagona...
We investigate the Josephson coupling between two singlet superconductors separated by a half-metallic magnet. The mechanism behind the coupling is provided by the rotation of the quasiparticle spin in the superconductor during reflection events at the interface with the half metal. Spin rotation induces triplet correlations in the superconductor which, in the presence of surface spin-flip scat...
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