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Journal of Applied Physics : Low Schottky barrier height for ErSi2...

By: Nicolas Reckinger, Xiaohui Tang, Vincent Bayot, Dmitri A. Yarekha, Emmanuel Dubois et al

Description: In this paper, the formation of Er disilicide (ErSi2−x) with a Ti cap on low doping n-type Si(100) is investigated. After deposition in ultrahigh vacuum, the solid-state reaction between Er and Si is performed ex situ by rapid thermal annealing between 450 and 600 °C in a forming gas ambience with a 10 nm thick Ti capping layer to protect Er from oxidation. X-ray diffraction analyses have confirmed the formation of ErSi2−x for all annealing temperatures. The...

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Biblioteca Hispanica : Course of Natural History for the 2Nd Expan...

By: Francisco Cobeno Canovas
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Journal of Applied Physics : Ion transport in polyacetylene ionomers

By: Fuding Lin, Yongjun Wang, and Mark Lonergan

Description: Ion transport in cationically and anionically functionalized polyacetylene ionomers, PAC and PAA, respectively, was investigated by analyzing the impedance responses of thin film Au∣ionomer∣Au sandwich configurations. Samples were measured over a frequency range of 10−2–106 Hz and a temperature range of 298–398 K. Electrode polarization at low frequencies and dispersion due to ion hopping at higher frequencies were observed. The impedance data were analyzed ...

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Applied Physics Letters : Terahertz electromagnetic interference s...

By: M. A. Seo, J. H. Yim, Y. H. Ahn, F. Rotermund, D. S. Kim et al

Description: We performed time-domain terahertz spectroscopy on thin layers of single-walled carbon nanotubes (SWCNTs) coated on flexible films. The SWCNT layers demonstrate good shielding of electromagnetic waves in the terahertz range while maintaining good transparency for visible light. The shielding efficiency can be engineered through the thickness control and/or chemical treatment of SWCNT layers. The frequency-dependent dielectric constants of SWCNT layers are in...

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Physics of Fluids : Unsteady flow separation on slip boundaries

By: Francois Lekien and George Haller

Description: We derive analytic criteria for the location and angle of unsteady particle separation and reattachment in two-dimensional flows with free-slip boundary conditions. Our wall-based criteria show that, in general, fluid breakaway from the boundary takes place at locations different from either instantaneous or averaged stagnation points. Indeed, for time-varying flows, separation does not occur along a free streamline or along an average free streamline. We ap...

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Applied Physics Letters : Multilevel sensitization of Er3+ in low-...

By: Oleksandr Savchyn, Ravi M. Todi, Kevin R. Coffey, and Pieter G. Kik

Description: The dynamics of Er3+ excitation in low-temperature-annealed Si-rich SiO2 are studied. It is demonstrated that Si-excess-related indirect excitation is fast (transfer time τtr<27 ns) and occurs into higher lying Er3+ levels as well as directly into the first excited state (4I13/2). By monitoring the time-dependent Er3+ emission at 1535 nm, the multilevel nature of the Er3+ sensitization is shown to result in two types of excitation of the 4I13/2 state: a fast...

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Chaos : The organization of intrinsic computation: Complexity-entr...

By: David P. Feldman, Carl S. McTague, and James P. Crutchfield

Description: Intrinsic computation refers to how dynamical systems store, structure, and transform historical and spatial information. By graphing a measure of structural complexity against a measure of randomness, complexity-entropy diagrams display the different kinds of intrinsic computation across an entire class of systems. Here, we use complexity-entropy diagrams to analyze intrinsic computation in a broad array of deterministic nonlinear and linear stochastic proc...

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Chaos : Inferring connectivity of interacting phase oscillators

By: Dongchuan Yu, Luigi Fortuna, and Fang Liu

Description: The question as to how network topology properties influence network dynamical behavior has been extensively investigated. Here we treat the inverse problem, i.e., how to infer network connection topology from the dynamic evolution, and suggest a control based topology identification method. This method includes two steps: (i) driving the network to a steady state and (ii) inferring all elements of the connectivity matrix by exploiting information obtained f...

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Applied Physics Letters : Influence of polarity on carrier transpo...

By: Yoshinobu Kawaguchi, Chia-Yen Huang, Yuh-Renn Wu, Qimin Yan, Chih-Chien Pan et al

Description: We investigate the influence of polarity on carrier transport in single-quantum-well and multiple-quantum-well (MQW) light-emitting diodes (LEDs) grown on the semipolar (20¯21) and (20¯21) orientations of free-standing GaN. For semipolar MQW LEDs with the opposite polarity to conventional Ga-polar c-plane LEDs, the polarization-related electric field in the QWs results in an additional energy barrier for carriers to escape the QWs. We show that semipolar (20...

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Journal of Applied Physics : High-performance C60 n-channel organi...

By: Xiao-Hong Zhang and Bernard Kippelen

Description: High-performance C60 organic field-effect transistors (OFETs) have been obtained by engineering the essential electrode/semiconductor and dielectric/semiconductor interfaces. By using calcium (Ca) as the source and drain electrodes, the width-normalized contact resistance (RCW) at the electrode/semiconductor interface for devices with channel lengths ranging from 200 down to 25 μm could be reduced to a constant value of 2 kΩ cm at a gate-source voltage (VGS)...

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Journal of Applied Physics : Relaxations in Ba2BiSbO6 double compl...

By: Manoel Carvalho Castro, Carlos William de Araujo Paschoal, Frank C. Snyder, and Michael W. Lufaso

Description: The electric properties of the complex double perovskite Ba2BiSbO6 have been investigated using impedance spectroscopy in the frequency range from 1 Hz up to 1 MHz and in the temperature range from room temperature up to 560 K. There are two contributions to the electrical properties due to the grain and grain boundary. The oxygen vacancies play an important role in the conductivity and strongly increase the dielectric constant at high temperatures. The anal...

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Physics of Plasmas : Toroidal self-consistent modeling of drift ki...

By: Yueqiang Liu, M. S. Chu, I. T. Chapman, and T. C. Hender

Description: A self-consistent kinetic model is developed to study the stability of the resistive wall mode in toroidal plasmas. This model is compared with other models based on perturbative approaches. The degree of the kinetic modification to the stability of the mode depends on the plasma configurations. Both stabilizing and destabilizing kinetic effects are observed. The nonperturbative approach, with a self-consistent inclusion of the eigenfunctions and the eigenva...

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Physics of Plasmas : Solitary inertial Alfvén waves in dusty plasmas

By: S. Mahmood and H. Saleem

Description: Linear and nonlinear inertial Alfvén waves are studied in the presence of positively and negatively charged dust in electron-ion plasmas. The Sagdeev potential approach is employed to obtain solitary inertial Alfvén waves in such a multicomponent plasma. It is found that electron density dips are formed in the super Alfvénic region, which has behavior similar to the case of electron-ion plasmas. The amplitude of the electron density dip structure is decrease...

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Applied Physics Letters : Low temperature diffusion length of exci...

By: Naoyuki Ino and Naoki Yamamoto

Description: Monochromatic cathodoluminescence (CL) images of threading dislocations in GaN epitaxial layers were observed using a transmission electron microscopy combined with CL system. The carrier diffusion lengths were derived from the free exciton emission intensity profile of the dislocation contrast in the CL images. The carrier diffusion lengths in Si-doped and Mg-doped GaN were nearly the same and shorter than that in undoped GaN in the temperature range from 2...

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Journal of Applied Physics : Alternative to classic annealing trea...

By: O. Van Overschelde, G. Guisbiers, F. Hamadi, A. Hemberg, R. Snyders et al

Description: Titanium dioxide thin films have been deposited by reactive magnetron sputtering on glass and subsequently irradiated by UV radiation using a KrF excimer laser. The influence of the laser fluence (F) on the constitution and microstructure of the deposited films is studied for 0.05

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Biblioteca Hispanica : Course of Natural History, Physiology and H...

By: Ramon Vigil Martinez
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Physics of Fluids : Natural convection in enclosures with partiall...

By: P. Kandaswamy, N. Nithyadevi, and C. O. Ng

Description: Unsteady laminar natural convection in an enclosure with partially thermally active side walls and internal heat generation is studied numerically. Thermally inactive parts of the side walls and horizontal walls are thermally insulated. The governing equations are solved using the control volume method with a power law scheme. Nine different combinations of the hot and cold thermally active zones are considered. The effects of heat generations, aspect ratios...

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Biblioteca Hispanica : Programme of Natural History, Physiology an...

By: Luis Perez Minguez
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Chaos : Phase synchronization in tilted inertial ratchets as chaot...

By: José L. Mateos and Fernando R. Alatriste

Description: The phenomenon of phase synchronization for a particle in a periodic ratchet potential is studied. We consider the deterministic dynamics in the underdamped case where the inertia plays an important role since the dynamics can become chaotic. The ratchet potential is tilted due to a constant external force and is rocking by an external periodic forcing. This potential has to be tilted in order to obtain a rotator or self-sustained nonlinear oscillator in the...

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Biblioteca Hispanica : Treaty Elemental Natural History

By: Mariano Water Monreal
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