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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 Mathematical Physics : Symmetry, full symmetry groups, ...

By: Biao Li, Wang-Chuan Ye, and Yong Chen

Description: The Lie symmetry algebra of a generalized Davey–Stewartson (GDS) system is obtained. The general element of this algebra depends on eight arbitrary functions of time, which has a Kac–Moody–Virasoro loop algebra structure and is isomorphic to that of the standard integrable Davey–Stewartson equations under certain conditions imposed on parameters and arbitrary functions. Then based on the symmetry group direct method proposed by Lou and Ma [J. Phys. A 38, L12...

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Applied Physics Letters : Efficient readout of micromechanical res...

By: W. J. Venstra and H. S. J. van der Zant

Description: We present a method for efficient spectral readout of mechanical resonator arrays in dissipative environments. Magnetomotive drive and detection are used to drive double clamped resonators in the nonlinear regime. Resonators with almost identical resonance frequencies can be tracked individually by sweeping the drive power. Measurements are performed at room temperature and atmospheric pressure. These conditions enable application in high throughput resonant sensor arrays.

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Biblioteca Hispanica : Elements of Natural History Testo Work Sic ...

By: M. Ramos and Lafuente
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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 : An in situ electrical study on primary h...

By: Chikai Lin, Zhenzhen Yang, Tao Xu, and Yufeng Zhao

Description: Primary hydrogen spillover has been studied using a unique electrical method. We observed that at ambient temperature, when a discontinuous nanogranular Pd film is on the top of an amorphous carbon film, the electrical conductance of the carbon film decreases in pressurized hydrogen. In comparison, in the absence of this Pd layer, the conductance of the carbon film remains unchanged in pressurized hydrogen. The observed decrease in the current in the Pd/carb...

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Journal of Applied Physics : Reflection chromaticity of multilayer...

By: E. M. Nascimento, I. N. de Oliveira, and M. L. Lyra

Description: We investigate the chromaticity of the light reflected by multilayered structures containing cholesteric liquid crystals (ChLCs). We considered a single-pitched ChLC multilayered system with quasiperiodic Fibonaccian phase defects as well as an alternate sequence of single-pitched ChLC and isotropic dielectric layers. Using the Berreman 4×4 matrix formalism, we numerically obtain the reflection spectrum and the chromaticity diagram of these structures. The a...

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The Journal of Chemical Physics : Structure of gold atoms on stoic...

By: Changjun Zhang, Angelos Michaelides, David A. King, and Stephen J. Jenkins

Description: Within the framework of the GGA+U implementation of density functional theory, we investigate atomistic and electronic structures of Au adsorbed on the stoichiometric and the defective CeO2{111} surfaces, in the latter of which either O or Ce vacancies are presented. We show that on the stoichiometric surface, the most stable adsorption site of Au is not on the top of the outermost O atoms, as previously suggested, but on a bridgelike site in which the Au di...

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Journal of Mathematical Physics : Adiabatically switched-on electr...

By: H. D. Cornean, P. Duclos, G. Nenciu, and R. Purice

Description: Consider a three dimensional system which looks like a cross connected pipe system, i.e., a small sample coupled to a finite number of leads. We investigate the current running through this system, in the linear response regime, when we adiabatically turn on an electrical bias between leads. The main technical tool is the use of a finite volume regularization, which allows us to define the current coming out of a lead as the time derivative of its charge. We...

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Physics of Plasmas : Demonstration of detuning and wavebreaking ef...

By: N. A. Yampolsky, N. J. Fisch, V. M. Malkin, E. J. Valeo, R. Lindberg et al

Description: A plasma-based resonant backward Raman amplifier/compressor for high power amplification of short laser pulses might, under ideal conditions, convert as much as 90% of the pump energy to the seed pulse. While the theoretical highest possible efficiency of this scheme has not yet been achieved, larger efficiencies than ever before obtained experimentally (6.4%) are now being reported, and these efficiencies are accompanied by strong pulse compression. Based o...

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The Journal of Chemical Physics : Intrinsic thermal expansivity an...

By: I. Brovchenko, R. R. Burri, A. Krukau, A. Oleinikova, and R. Winter

Description: Volumetric and conformational properties of the amyloid β(1–42) peptide (Aβ42) are studied in relation to the properties of hydration water in a wide temperature range by computer simulations. The apparent volume of Aβ42, which is the change in the total volume of the solution due to the presence of Aβ42, shows a quite different temperature dependence below and above T ≈ 320 K. The apparent thermal expansion coefficient αapp(Aβ42) is about 1.5×10−3 K−1 at T ...

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Journal of Applied Physics : Effects of indium segregation on opti...

By: Tomoya Inoue, Masataka Mamizuka, Hiroshi Mizuno, Osamu Kojima, Takashi Kita et al

Description: The emission wavelength of InAs quantum dots (QDs) capped by GaAs is found to be systematically controlled by doping nitrogen on the QDs surface with a thin spacer layer in between QDs and the nitrogen-doped layer. Cross-sectional transmission electron microscope images of the nitrogen-doped QD indicate that the nitrogen-doped layer acts as a blocking layer for In segregation. Furthermore, the in-plane linear polarization of the emission has been demonstrate...

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Applied Physics Letters : Energy gap modulation in V2O5 nanowires ...

By: Byung Hoon Kim, Ansoon Kim, Soon-Young Oh, Sung-Soo Bae, Yong Ju Yun et al

Description: The current-voltage characteristics at various pressures (2–10 atm) and the scanning tunneling microscopy of vanadium pentoxide nanowires (VONs) with the inert gases (He, Ne, and Ar) and diatomic molecules (H2, N2, O2) have been investigated. The gas dependent conductance (G) is consistent with the inverse energy gap obtained from the scanning tunneling spectroscopy study for the gas-adsorbed single VON. The three possible interactions for gas adsorption of ...

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Biblioteca Hispanica : List of Gentlemen Who Compose the Spanish S...

By: Madrid
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Biblioteca Hispanica : Programme Course of Natural History Items

By: M. Ramos and Lafuente
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Physics of Plasmas : Spectroscopic study on rotational and vibrati...

By: Xiao-Jiang Huang, Yu Xin, Lei Yang, Quan-Hua Yuan, and Zhao-Yuan Ning

Description: By using optical emission spectroscopy, the vibrational and rotational temperatures of N2 and N2+ in capacitively coupled plasma (CCP) discharges driven by dual-frequency 41 MHz and 2 MHz are investigated. The vibrational and rotational temperatures are measured based on the N2+ first negative system and N2 second positive system overlapped molecular emission optical spectrum, using the method of comparing the measured and calculated spectra with a least-squ...

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Applied Physics Letters : Temperature distribution and modificatio...

By: Masaaki Sakakura, Masahiro Shimizu, Yasuhiko Shimotsuma, Kiyotaka Miura, and Kazuyuki Hirao

Description: Heat accumulation by high repetition rate femtosecond laser irradiation inside glass generates a much larger modification than that by a single pulse. In this study, we determined the temperature distribution due to heat accumulation and the characteristic temperature for heat modification inside a soda lime glass by analyzing the relationship between the radius of modification and glass temperature. The validity of the analysis was confirmed by reproducing ...

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Biblioteca Hispanica : Treaty Elemental Natural History

By: Mariano Water Monreal
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Applied Physics Letters : Residual strain in nonpolar a-plane Zn1-...

By: J.-M. Chauveau, J. Vives, J. Zuniga-Perez, M. Laügt, M. Teisseire et al

Description: We investigate the dependence on Mg content of the lattice parameters and the surface morphology of nonpolar a-(112¯0) Zn1−xMgxO (x ≤ 0.55) grown by molecular beam epitaxy. The anisotropy of the lattice parameters gives rise to an unusual in-plane strain state in the ZnO QWs: tensile strain along [11¯00] and compressive strain along 0001 . For a Zn0.6Mg0.4O barrier, the strain in a ZnO QW reaches −1.3% along 0001 and +0.3% along [11¯00]. This induces a s...

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Biblioteca Hispanica : the Wonders of Nature

By: A. Ramon Sanchez
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