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Applied Physics Letters : The effect of aluminum oxide incorporati...

By: Monica Sawkar-Mathur, Ya-Chuan Perng, Jun Lu, Hans-Olof Blom, John Bargar et al

Description: Hafnium aluminate thin films were synthesized by atomic layer deposition (ALD) to assess the effect of aluminum oxide incorporation on the dielectric/Ge interfacial properties. In these HfxAlyOz thin films, the Hf to Al cation ratio was effectively controlled by changing the ratio of hafnium oxide to aluminum oxide ALD cycles, while their short range order was changed upon increasing aluminum oxide incorporation, as observed by extended x-ray absorption fine...

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Journal of Applied Physics : Thermal transport properties of nanoc...

By: Chien-Neng Liao, Yu-Chu Wang, and Hsu-Shen Chu

Description: Grain-size dependent thermal conductivity of sputtered nanocrystalline Bi–Sb–Te thin films was measured by a 3ω method. By changing deposition temperature from 100 °C to room temperature, the mean grain size of the Bi–Sb–Te films decreased from 83 to 26 nm and the lattice thermal conductivity reduced from 0.79 to 0.45 W/mK proportionally. The effect of grain boundary on lattice thermal conductivity can be described by an effective thermal boundary resistance...

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Journal of Applied Physics : Thermal phonon resonance observed wit...

By: Yasuo Minami and Keiji Sakai

Description: We observed resonating thermal phonons in a cavity. The combination of our millisecond Brillouin scattering technique and this phonon resonance observation enables the determination of phonon velocity with an accuracy of 10−4 within an observation time of 30 ms. In the experiment, phonon propagation in a confined space filled with liquid toluene was observed. The observed phonon resonance spectra agree with theoretical predictions.

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Applied Physics Letters : Probing antiphase boundaries in Fe3O4 th...

By: Shailja Tiwari, D. M. Phase, and R. J. Choudhary

Description: We present Raman study of Fe3O4 films of different thicknesses grown on single crystal Si and MgO substrates to investigate the presence of antiphase boundaries (APBs). X-ray diffraction and x-ray photoelectron spectroscopy measurements indicate that films are single phase Fe3O4 on both the substrates. The changes in frequency and linewidth of different Raman modes [A1g and T2g(3)] are monitored and the electron-phonon coupling parameter (λ) is computed. λ i...

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Physics of Fluids : Viscous jet drawing air into a bath

By: Etienne Reyssat, Elise Lorenceau, Frédéric Restagno, and David Quéré

Description:

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The Journal of Chemical Physics : A first principles theoretical s...

By: Bhabani S. Mallik, A. Semparithi, and Amalendu Chandra

Description: A theoretical study of vibrational spectral diffusion and hydrogen bond dynamics in aqueous ionic solutions is presented from first principles without employing any empirical potential models. The present calculations are based on ab initio molecular dynamics for trajectory generation and wavelet analysis of the simulated trajectories for time dependent frequency calculations. Results are obtained for two different deuterated aqueous solutions: the first one...

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Physics of Fluids : Numerical study of the Guderley and Vasilev re...

By: Andrea Defina, Francesca Maria Susin, and Daniele Pietro Viero

Description: We present high-resolution numerical solutions of the depth-averaged two-dimensional inviscid shallow water equations which provide new information on shock reflection configuration within the von Neumann paradox conditions. The computed flow field and shock wave patterns close to the triple point for the Guderley and the Vasilev reflections confirm the four-wave theory. We suggest that the most likely Guderley reflection model is a four-wave pattern with a ...

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Journal of Applied Physics : Reduced bound exciton and surface exc...

By: Y. Z. Zhang, H. P. He, Y. Z. Jin, B. H. Zhao, Z. Z. Ye et al

Description: Temperature-dependent photoluminescence (PL) spectroscopy is employed to investigate the effects of exposure to ambient air on the optical property of Al-doped ZnO nanorods. Low temperature PL of the as-grown nanorods shows dominant D0X (excitons bound to neutral donors) emission at 3.363 eV and surface state-related emission at 3.310 eV. After exposure to ambient air, both of them vanish and the first LO phonon replica of free exciton is observed instead. I...

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Journal of Applied Physics : Tuning of magnetism in SrRuO3 thin fi...

By: B. W. Lee, C. U. Jung, M. Kawasaki, and Y. Tokura

Description: Control of the magnetic easy axis in SrRuO3 thin films is important for tunnel junction studies incorporating this layer and for wider device applications. Previously, we demonstrated control of the magnetic easy axis in SrRuO3 thin films on SrTiO3 (110) substrates by introducing tunable anisotropic strain through a CaHfO3 buffer layer. However, our method was not directly applicable due to the existence of twins in the CaHfO3 layer that grew on the SrTiO3 (...

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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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Chaos : Complete periodic synchronization in coupled systems

By: Wei Zou and Meng Zhan

Description: Recently, complete chaotic synchronization in coupled systems has been well studied. In this paper, we study complete synchronization in coupled periodic oscillators with diffusive and gradient couplings. Eight typical types of critical curve for the transverse Lyapunov exponent of standard mode, which give rise to different synchronization-desynchronization patterns, are classified. All possible desynchronous behaviors including steady state, periodic state...

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Applied Physics Letters : Bandgap engineering by tuning particle s...

By: M. B. Sahana, C. Sudakar, G. Setzler, A. Dixit, J. S. Thakur et al

Description: We report the structural and optical properties of xSnO2–yFe2O3 nanocrystalline composite thin films. SnO2 and Fe2O3 exhibit strong phase separation instability and their particle size and crystallinity are tunable by changing their composition and annealing temperature. The bandgap for these composites continuously increases from 2.3 to 3.89 eV. We discuss the increasing bandgap values in terms of the quantum confinement effect manifested by the decreasing ...

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The Journal of Chemical Physics : A noniterative perturbative trip...

By: Prashant U. Manohar and Anna I. Krylov

Description: A noniterative N 7 triples correction for the equation-of-motion coupled-cluster method with single and double substitutions (CCSD) is presented. The correction is derived by second-order perturbation treatment of the similarity-transformed CCSD Hamiltonian. The spin-conserving variant of the correction is identical to the triples correction of Piecuch and co-workers [Mol. Phys. 104, 2149 (2006) ] derived within method-of-moments framework and is not size in...

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The Journal of Chemical Physics : Structural, dynamic, and electro...

By: L. Calderín, D. J. González, L. E. González, and J. M. López

Description: We report on a study of several structural, dynamic, and electronic properties of liquid Sn at a thermodynamic state close to the triple point (573 K) and another one at a higher temperature (1273 K). This study has been performed by ab initio molecular dynamics simulations using 205 atoms and around 20 ps of simulation time. The calculated static structures show a good agreement with the available experimental data. The dynamic structure factors fairly agre...

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Biblioteca Hispanica : the Wonders of Nature

By: A. Ramon Sanchez
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Journal of Mathematical Physics : The calculation of the bilinear ...

By: Ji-jun Ao and Achilaltu Wang

Description: The formula of the bilinear Boltzmann integral operator of gas mixtures is obtained. With the use of Bobylev’s transform it can be carried out much easier and an extended formula of more general validity is obtained. The formula can give the eigenvalues and the eigenfunctions of the bilinear Boltzmann integral operator of a gas mixture, which is essential to the solution of the Boltzmann equation.

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The Journal of Chemical Physics : Quantum-state resolved reactive ...

By: Alexander M. Zolot, Paul J. Dagdigian, and David J. Nesbitt

Description: Exothermic chemical reaction dynamics at the gas-liquid interface have been investigated by colliding a supersonic beam of F atoms [Ecom = 0.7(3) kcal/mol] with a continuously refreshed liquid hydrocarbon (squalane) surface under high vacuum conditions. Absolute HF(v,J) product densities are determined by infrared laser absorption spectroscopy, with velocity distributions along the probe axis derived from high resolution Dopplerimetry. Nascent HF(v ⩽ 3) prod...

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Journal of Applied Physics : Optical properties of Yb3+ doped Lu3A...

By: Alessandra Toncelli, Mohamed Alshourbagy, and Mauro Tonelli

Description: Yb doped Lu3Al5O12 single crystal fibers has been grown with various Yb3+ ion concentrations: 2%, 5%, 10%, 15%, and 50% Yb doping levels. The diameter of the fibers is around 3 mm and their length is up to 110 mm. The fibers have been annealed in air at 1400 °C for 24 h to remove Yb2+ produced during the growth in the fibers. Structural characterization by x-ray diffraction method has been performed to confirm the monocrystalline phase and the orientation of...

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Biblioteca Hispanica : Mechanical Applied to Constructions

By: Joseph Marva and Mayer
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Review of Scientific Instruments : Fabrication of gravity-driven m...

By: H. Yamada, Y. Yoshida, N. Terada, S. Hagihara, T. Komatsu et al

Description: We have studied the micro total analysis system as a blood test. A microfluidic device with a three-pronged microchannel and artificial capillary vessels was fabricated. The microchannel is to transport blood, focus blood cells, and line them up. The vessels are to observe red blood cell deformation. An excimer laser was used to form grooves and so on. Numbers of thermosetting resin film and fluororesin were piled up on a cover glass. A laser fabricated part...

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