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Chaos : Introduction: Fifth Annual Gallery of Nonlinear Images (Ne...

By: Predrag Cvitanovic, M. Cristina Marchetti, Sidney Redner, and Arshad A. Kudrolli

Description:

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Applied Physics Letters : Organic heterostructure device with nonv...

By: Frank Lindner, Karsten Walzer, and Karl Leo

Description: Recently, several memory devices based on organic semiconductors were reported. In most cases, single organic layers were employed, and the switching mechanisms were not fully understood. Here, we report on a novel device structure based on electrically doped organic heterostructures showing highly stable memory behavior. The organic layers are embedded between a bottom indium tin oxide and a top metal contact and form a quantum well-like structure. The devi...

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Journal of Applied Physics : Spectroscopic characterization of las...

By: Nek M. Shaikh, Sarwat Hafeez, M. A. Kalyar, R. Ali, and M. A. Baig

Description: We present optical emission studies of the laser ablation brass plasma generated by the fundamental, second, and third harmonics of a neodymium doped yttrium aluminum garnet laser. The spectra predominantly reveal the spectral lines of the neutral and singly ionized copper and zinc. The excitation temperatures are determined by the Boltzmann plot method, whereas the electron number densities have been extracted from the Stark broadened line profiles. The spa...

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Applied Physics Letters : Conformable coating of SiO2 on hydrother...

By: B. H. Chu, L. C. Leu, C. Y. Chang, F. Lugo, D. Norton et al

Description: Coating silicon dioxide on hydrothermally grown ZnO nanorods is demonstrated using a low temperature plasma enhanced chemical vapor deposition (PECVD) system.Wurtzite structured ZnO nanorods were prepared by spin coating ZnO nanocrystals onto plastics or glass substrates. Then, the nanorods were subsequently grown in a zinc nitrate solution. SiO2 was deposited by PECVD at 50 °C. No current could be measured through the patterned metal dots on the SiO2 coated...

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Journal of Applied Physics : Comparison of resonant-phonon-assiste...

By: H. Li, J. C. Cao, Z. Y. Tan, and S. L. Feng

Description: The authors compare resonant-phonon-assisted terahertz quantum-cascade lasers with different active region designs, i.e., one-well injector and three-well module, using an ensemble Monte Carlo method. Carrier transport under injection anticrossing, parasitic anticrossing, and collection anticrossing couplings are investigated for both structures. The results show that the main parasitic current channel is the resonance of the injector 1′ with the lower lasin...

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Applied Physics Letters : Charge loss behavior of a metal-alumina-...

By: Man Chang, Minseok Jo, Seonghyun Kim, Yongkyu Ju, Seungjae Jung et al

Description: We found that the charge loss behavior of metal-alumina-nitride-oxide-silicon-type flash memory was highly dependent on the amount of injected charge (Qinj). Beyond the critical level of Qinj, the direction of the dominant charge loss changed from pointing toward SiO2 to pointing toward Al2O3. The highly injected charges could cause the band bending of Al2O3, which reduced the tunneling distance across Al2O3 with the low conduction band offset. These results...

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Journal of Applied Physics : Blue-green upconversion emission in Z...

By: E. de la Rosa, D. Solis, L. A. Díaz-Torres, P. Salas, C. Angeles-Chavez et al

Description: Strong blue-green cooperative upconversion emission was observed under infrared excitation in 70 nm average crystallite size ZrO2:Yb3+ nanocrystals prepared by sol-gel process. The structural characterization was performed by x-ray diffraction and high resolution transmission electron microscopy suggesting that crystalline phase of nanoparticles is controlled by active ion concentration. The cooperative absorption coefficient η ∼ 2.5×10−22 is four orders of ...

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Physics of Plasmas : Physics of collisionless phase mixing

By: D. Tsiklauri and T. Haruki

Description: Previous studies of phase mixing of ion cyclotron (IC), Alfvénic, waves in the collisionless regime have established the generation of parallel electric field and hence acceleration of electrons in the regions of transverse density inhomogeneity. However, outstanding issues were left open. Here we use the 2.5 D, relativistic, fully electromagnetic particle-in-cell code and an analytic magnetohydrodynamic (MHD) formulation, to establish the following points: ...

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Biblioteca Hispanica : Opening Address at the Real Seminario De Ve...

By: Luis Sanchez De Toca
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Review of Scientific Instruments : A collective scattering system ...

By: D. R. Smith, E. Mazzucato, W. Lee, H. K. Park, C. W. Domier et al

Description: A collective scattering system has been installed on the National Spherical Torus Experiment (NSTX) to measure electron gyroscale fluctuations in NSTX plasmas. The system measures fluctuations with k⊥ρe≲0.6 and k⊥≲20 cm−1. Up to five distinct wavenumbers are measured simultaneously, and the large toroidal curvature of NSTX plasmas provides enhanced spatial localization. Steerable optics can position the scattering volume throughout the plasma from the magnet...

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Physics of Fluids : The influence of gravity on the steady propaga...

By: Andrew L. Hazel and Matthias Heil

Description: Motivated by discrepancies between recent bench-top experiments [ A. Juel and A. Heap, J. Fluid Mech. 572, 287 (2007) ] and numerical simulations [ A. L. Hazel and M. Heil, ASME J. Biomech. Eng. 128, 573 (2006) ] we employ computational methods to examine the effects of transverse gravity on the steady propagation of a semi-infinite, inviscid air finger into a two-dimensional elastic channel filled with a Newtonian fluid. The special case of propagation in a...

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Biblioteca Hispanica : the Earth and Its Inhabitants Basic Knowled...

By: Jaime Rise and Nicolau
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Applied Physics Letters : Crystalline silicon carbide nanocones an...

By: Zhenyu Liu, Lijie Ci, V. Srot, N. Y. Jin-Phillipp, Peter A. van Aken et al

Description: We present the formations of crystalline silicon carbide (SiC) nanocones and heterostructures catalyzed by iron nanoparticles, originally encapsulated in graphite-like carbon shells, via the vapor-liquid-solid process. We propose that the nanocone shape is due to the release of iron nanoparticles from their carbon shells followed by agglomeration, where the increasing size of the iron nanoparticle during SiC growth creates the nanocone shape. The release and...

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Applied Physics Letters : Enhanced contrast coherent anti-Stokes R...

By: Michael R. Beversluis and Stephan J. Stranick

Description: We have experimentally demonstrated enhanced image contrast of sample fine structure in a coherent anti-Stokes Raman scattering (CARS) microscope using liquid crystal spatial light modulators as programmable Toraldo-style pupil phase masks. We demonstrated through modeling, implementation, and verification of the focal intensity and phase distributions of the excitation beams the trade-offs between improved image contrast and CARS signal levels.

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Applied Physics Letters : Single quantum dot emission by nanoscale...

By: F. Patella, F. Arciprete, E. Placidi, M. Fanfoni, A. Balzarotti et al

Description: We report on single dot microphotoluminescence (μPL) emission at low temperature and low power from InAs dots grown by molecular beam epitaxy in nanoscale holes of a SiO2 mask deposited on GaAs(001). By comparing atomic force microscopy measurements with μPL data, we show that the dot sizes inside the nanoholes are smaller than those of the dots nucleated on the extended GaAs surface. PL of dots spans a wide energy range depending on their size and on the th...

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Chaos : Multistability and arithmetically period-adding bifurcatio...

By: Younghae Do and Ying-Cheng Lai

Description: Multistability has been a phenomenon of continuous interest in nonlinear dynamics. Most existing works so far have focused on smooth dynamical systems. Motivated by the fact that nonsmooth dynamical systems can arise commonly in realistic physical and engineering applications such as impact oscillators and switching electronic circuits, we investigate multistability in such systems. In particular, we consider a generic class of piecewise smooth dynamical sys...

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Journal of Applied Physics : Optical and structural properties of ...

By: D. Singh, K. Singh, B. S. Bajwa, G. S. Mudahar, D. P. Singh et al

Description: The density, molar volume, optical energy bandgap, and infrared absorption spectra in the range 400–4000 nm of borate glasses with composition 2xLi2O–xAl2O3–(1–3x)B2O3 (x varying from 0.10 to 0.18 mol fraction) prepared by conventional melt quench technique have been measured before and after successive γ-ray irradiation at the dose of 2.5 K Gy to elucidate the effect of gamma irradiation on such glasses. The radiation induced defects created by γ-ray and th...

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The Journal of Chemical Physics : Analysis of polyatomic molecules...

By: Peter C. Chen and Kamilah Mitchell

Description: The peak-sorting capabilities of high resolution coherent two-dimensional (2D) spectroscopy provide a new way of dealing with severe rotational congestion. This paper describes the application of this technique to the polyatomic molecule, NO2. NO2 is a primary component of photochemical smog and has a notoriously complex and congested spectrum that extends from the infrared to the ultraviolet regions. This spectrum is infamous for having an unusually high de...

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Review of Scientific Instruments : Cavity-dumped 2.70µm erbium las...

By: Young Ho Park, Dong Won Lee, Hong Jin Kong, and Yeong Sik Kim

Description: A cavity-dumped 2.70 μm erbium laser with a frustrated total internal reflection (FTIR) shutter was investigated and compared with a Q-switched erbium laser using the FTIR shutter. The Q-switched and the cavity-dumped 2.70 μm laser outputs were obtained with a dichroic coated mirror with high reflectance at 2.70 μm and high transmittance at 2.79 μm. For the Q-switched operation, a maximum peak power of 33.5 kW was achieved, and its pulse width was 1.3 μs. Fo...

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Journal of Applied Physics : Strain relaxation in InAs self-assemb...

By: J. F. Chen, C. H. Yang, Y. H. Wu, L. Chang, and J. Y. Chi

Description: The effect of a high N incorporation in self-assembled InAs quantum dots (QDs) is investigated by analyzing the electronic and structural properties around QD region. Capacitance-voltage profiling and admittance spectroscopy shows that N incorporation into the InAs QD layer leads to drastic carrier depletion in the QD layer and neighboring GaAs layers due to the formation of a deep defect state at 0.34–0.41 eV. The signature of this defect state is similar t...

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