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Absorption (logic)
About: Absorption (logic) is a research topic. Over the lifetime, 5733 publications have been published within this topic receiving 236302 citations.
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TL;DR: In this paper, the space-charge limited current-voltage characteristics of evaporated layers of vitreous selenium from 2.4 to 60 \ensuremath{\mu} thick are described.
Abstract: The space-charge limited current-voltage characteristics of evaporated layers of vitreous selenium from 2.4 to 60 \ensuremath{\mu} thick are described. It is shown that both an exponential and a Gaussian distribution of states will explain these characteristics. An analytic solution is derived for the case of the exponential distribution of states: $N(\ensuremath{\epsilon})={N}_{0}{e}^{\ensuremath{-}\frac{\ensuremath{\epsilon}}{\ensuremath{\Delta}}}$, where ${N}_{0}$ is the density of states at the valence band edge which is taken to be the origin of energy. This solution, with ${N}_{0}\ensuremath{\sim}{10}^{20}$ eV and $\ensuremath{\Delta}=0.067$ eV, will account for the characteristics of all the specimens independent of thickness. The model will also account for the results of the optical absorption, electron bombardment, quenching, and positive and negative photoresponse experiments of other workers. It is not possible to obtain an analytic solution for any of these cases for a Gaussian distribution of states: $N(E)={N}_{0}\mathrm{exp}{\ensuremath{-}\frac{{(E\ensuremath{-}{E}_{max})}^{2}}{{\ensuremath{\Delta}}^{2}}}$. However, it is shown that the distribution in energy of these states with ${E}_{max}=2.35$ eV and $\ensuremath{\Delta}=0.25$ eV fits the experimental results as well as does the exponential distribution. A Gaussian distribution of states would be expected theoretically in a disordered material such as vitreous selenium.
138 citations
TL;DR: For any unital separable simple infinite-dimensional nuclear C∗-algebra with finitely many extremal traces, this article showed that absorption, strict comparison and property (SI) are equivalent.
Abstract: For any unital separable simple infinite-dimensional nuclear C∗-algebra with finitely many extremal traces, we prove that \( \mathcal{Z} \)-absorption, strict comparison and property (SI) are equivalent. We also show that any unital separable simple nuclear C∗-algebra with tracial rank zero is approximately divisible, and hence is \( \mathcal{Z} \)-absorbing.
138 citations
Abstract: The electronic structure of ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{CuO}}_{4+\mathrm{\ensuremath{\delta}}}$ has been studied by measuring O 1s absorption edges using high-energy electron-energy-loss spectroscopy in transmission. Upon doping the insulating compound the conduction-band states are reduced and states in the gap are formed. When going from insulating to conducting compounds there is a continuous increase of states at the Fermi level, which is at the bottom of the gap. The insulator-metal transition is probably driven by delocalization of these states.
137 citations
TL;DR: In this paper, the crystal structure of the intermetallic compound Mg${\mathrm{Zn}} was determined from x-ray data furnished by Laue and rotation photographs.
Abstract: Crystals of the intermetallic compound, Mg${\mathrm{Zn}}_{2}$, were prepared and the crystal structure was determined from x-ray data furnished by Laue and rotation photographs. The crystal was found to have hexagonal axes with $a=5.15\mathrm{A}$ and $c=8.48\mathrm{A}$. The unit cell contains four molecules. The effect of absorption in the crystal in determining the wave-length giving a maximum intensity of reflection in Laue photographs was used to confirm the dimensions of the unit cell. The atoms have the positions: $\mathrm{Zn}:u, \overline{u}, \frac{1}{4}; 2\overline{u}, \overline{u}, \frac{1}{4}; u, 2u, \frac{1}{4}; \overline{u}, u, \frac{3}{4}; 2u, u, \frac{3}{4}; \overline{u}, 2\overline{u}, \frac{3}{4}; 0, 0, 0; 0, 0, \frac{1}{2}$ $\mathrm{Mg}:\frac{1}{3}, \frac{2}{3}, v; \frac{1}{3}, \frac{2}{3}, \frac{1}{2}\ensuremath{-}v; \frac{2}{3}, \frac{1}{3}, \frac{1}{2}+v; \frac{2}{3}, \frac{1}{3}, \overline{v}.$ Where $u=0.830$ and $v=0.062$. The least distance between two magnesium atoms is 3.15A, between two zinc atoms, 2.52A, and between a magnesium and a zinc atom, 3.02A.
137 citations
TL;DR: In this article, an ellipsometer was used with picosecond pulses to measure the time evolution of optically generated plasmas in intrinsic Ge. The authors measured the change in optical ellipticity of a weak probe beam following the absorption of an intense excitation pulse, which can be determined with a precision of a few seconds.
Abstract: An ellipsometer has been used with picosecond pulses to measure the time evolution of optically generated plasmas in intrinsic Ge. By measuring the change in optical ellipticity of a weak probe beam following the absorption of an intense excitation pulse, the time evolution of the plasma density can be determined with a precision of a few picoseconds. At a density of 1.7 \ifmmode\times\else\texttimes\fi{} ${10}^{20}$ ${\mathrm{cm}}^{\ensuremath{-}3}$, the ambipolar diffusivity of the plasma was observed to be a factor of 3 greater than the low-density value, consistent with a simple theoretical model of diffusion in the degenerate regime.
137 citations