APL: Structural, Mechanical, Thermodynamic, and Optical Properties of Condensed Matter http://scitation.aip.org/ APL: Structural, Mechanical, Thermodynamic, and Optical Properties of Condensed Matter Thermal expansion coefficients of BiSe and SbTe crystals from 10 K to 270 K http://link.aip.org/link/?APL/99/261912/1&agg=rss X. Chen, H. D. Zhou, A. Kiswandhi, I. Miotkowski, Y. P. Chen et al.<br/> Lattice constant of BiSe and SbTe crystals is determined by x-ray powder diffraction measurement in a wide temperature range. Linear thermal expansion coefficients (alpha) of the crystals are extracted, and considerable anisotropy between alpha and alpha is observed. The low temperature values of al ... [Appl. Phys. Lett. 99, 261912 (2011)] published Fri Dec 30, 2011. Quantitative strain mapping of InAs/InP quantum dots with 1 nm spatial resolution using dark field electron holography http://link.aip.org/link/?APL/99/261911/1&agg=rss David Cooper, Jean-Luc Rouviere, Armand Beche, Shima Kadkhodazadeh, Elizaveta S. Semenova et al.<br/> The optical properties of semiconductor quantum dots are greatly influenced by their strain state. Dark field electron holography has been used to measure the strain in InAs quantum dots grown in InP with a spatial resolution of 1 nm. A strain value of 5.4% 0.1% has been determined which is consist ... [Appl. Phys. Lett. 99, 261911 (2011)] published Fri Dec 30, 2011. Interplay of index contrast with periodicity in polymer photonic crystals http://link.aip.org/link/?APL/99/261913/1&agg=rss Chris E. Finlayson, Andrew I. Haines, David R. E. Snoswell, Andreas Kontogeorgos, Silvia Vignolini et al.<br/> We report how the strength of resonant Bragg reflection from polymeric photonic crystals (polymer opals) varies linearly with the refractive-index contrast, Deltan, in contrast to the quadratic buildup of Fresnel reflections scaling as (Deltan). This occurs due to the interplay of disorder and perio ... [Appl. Phys. Lett. 99, 261913 (2011)] published Fri Dec 30, 2011. Influence of silicon on the thermally-induced crystallization process of Si-SbTe phase change materials http://link.aip.org/link/?APL/99/261914/1&agg=rss Yan Cheng, Zhitang Song, Yifeng Gu, Sannian Song, Feng Rao et al.<br/> Si-SbTe phase change thin films with different silicon contents have been investigated by in situ heating technique in transmission electron microscopy (TEM). The studies show that Si-doping can significantly improve the thermal stability of Si-SbTe thin films, refine their grain size, and change th ... [Appl. Phys. Lett. 99, 261914 (2011)] published Fri Dec 30, 2011. High temperature thermal properties of thin tantalum nitride films http://link.aip.org/link/?APL/99/261906/1&agg=rss Elah Bozorg-Grayeli, Zijian Li, Mehdi Asheghi, Gil Delgado, Alexander Pokrovsky et al.<br/> Tantalum Nitride (TaN) films carry high heat fluxes in a variety of applications including diffusion barriers in magnetoresistive random access memory and buffer/absorbers in extreme ultraviolet masks. The thicknesses of these films are usually of the same order as the thermal energy carrier mean fr ... [Appl. Phys. Lett. 99, 261906 (2011)] published Thu Dec 29, 2011. Formation of metallic colloids in CaF by intense ultraviolet light http://link.aip.org/link/?APL/99/261909/1&agg=rss Stephan Rix, Ute Natura, Felix Loske, Martin Letz, Claudia Felser et al.<br/> Highest purity CaF single crystals are irreversibly modified when irradiated with millions of pulses of 193 nm light at fluences of 120 mJ/cm. Mie theory explains the observed haze by attributing the wavelength dependent extinction and the ratio between absorption and scattering to metallic colloids ... [Appl. Phys. Lett. 99, 261909 (2011)] published Thu Dec 29, 2011. Structural variability in LaSrTiO thin films http://link.aip.org/link/?APL/99/261907/1&agg=rss Meng Gu, Craig R. Dearden, Chengyu Song, Nigel D. Browning, and Yayoi Takamura<br/> LaSrTiO films were grown by pulsed laser deposition and characterized using aberration-corrected scanning transmission electron microscopy. Single-phase films with low resistivity and a near Ti valence state were stabilized by a large concentration of oxygen vacancies under reducing conductions. In ... [Appl. Phys. Lett. 99, 261907 (2011)] published Thu Dec 29, 2011. The indirect to direct band gap transition in multilayered MoS as predicted by screened hybrid density functional theory http://link.aip.org/link/?APL/99/261908/1&agg=rss Jason K. Ellis, Melissa J. Lucero, and Gustavo E. Scuseria<br/> Molybdenite (MoS) undergoes a transition from an indirect to direct gap semiconductor exhibiting strong photoluminescence when confined in a 2D monolayer. We investigate the effect of interlayer interactions on the band structure and density of states using the screened hybrid functional of Heyd, Sc ... [Appl. Phys. Lett. 99, 261908 (2011)] published Thu Dec 29, 2011. Optical properties of a-plane (Al, Ga)N/GaN multiple quantum wells grown on strain engineered ZnMgO layers by molecular beam epitaxy http://link.aip.org/link/?APL/99/261910/1&agg=rss Y. Xia, J. Brault, M. Nemoz, M. Teisseire, B. Vinter et al.<br/> Nonpolar (11[overline 2]0) AlGaN/GaN multiple quantum wells (MQWs) have been grown by molecular beam epitaxy on (11[overline 2]0) ZnMgO templates on r-plane sapphire substrates. The quantum wells exhibit well-resolved photoluminescence peaks in the ultra-violet region, and no sign of quantum confine ... [Appl. Phys. Lett. 99, 261910 (2011)] published Thu Dec 29, 2011. Facile creation of bio-inspired superhydrophobic Ce-based metallic glass surfaces http://link.aip.org/link/?APL/99/261905/1&agg=rss Kesong Liu, Zhou Li, Weihua Wang, and Lei Jiang<br/> A bio-inspired synthesis strategy was conducted to fabricate superhydrophobic Ce-based bulk metallic glass (BMG) surfaces with self-cleaning properties. Micro-nanoscale hierarchical structures were first constructed on BMG surfaces and then modified with the low surface energy coating. Surface struc ... [Appl. Phys. Lett. 99, 261905 (2011)] published Thu Dec 29, 2011. Ultra-coherent single photon source http://link.aip.org/link/?APL/99/261904/1&agg=rss H. S. Nguyen, G. Sallen, C. Voisin, Ph. Roussignol, C. Diederichs et al.<br/> We present an original type of single photon source in solid state, based on the coherent laser light scattering by a single InAs quantum dot. We demonstrate that the coherence of the emitted single photons is tailored by the resonant excitation with a spectral linewidth below the radiative limit. O ... [Appl. Phys. Lett. 99, 261904 (2011)] published Wed Dec 28, 2011. Microsecond linear optical response in the unusual nematic phase of achiral bimesogens http://link.aip.org/link/?APL/99/261903/1&agg=rss V. P. Panov, R. Balachandran, M. Nagaraj, J. K. Vij, M. G. Tamba et al.<br/> Some hydrocarbon linked mesogenic dimers are known to exhibit an additional nematic phase (N) below a conventional uniaxial nematic (N) phase. Although composed of non-chiral molecules, the N phase is found to exhibit linear (polar) switching under applied electric field. This switching has remarkab ... [Appl. Phys. Lett. 99, 261903 (2011)] published Wed Dec 28, 2011. Determination of miscibility in MgO-ZnO nanocrystal alloys by x-ray absorption spectroscopy http://link.aip.org/link/?APL/99/261901/1&agg=rss Sukit Limpijumnong, Jaru Jutimoosik, Nirawith Palakawong, Wantana Klysubun, Jiti Nukeaw et al.<br/> The local structure of MgZnO nanocrystals is studied using synchrotron x-ray absorption near edge structures (XANES) over the full range of composition, from x = 0 to 1. Mg and Zn K-edges XANES measurements allow us to selectively study the local environments around Mg and Zn atoms in these nanocrys ... [Appl. Phys. Lett. 99, 261901 (2011)] published Tue Dec 27, 2011. Revealing low-temperature atomic ordering in bulk Co-Pt with the high-throughput ab-initio method http://link.aip.org/link/?APL/99/261902/1&agg=rss Roman V. Chepulskii and Stefano Curtarolo<br/> The low-temperature phase diagram of bulk Co-Pt is studied with a high-throughput ab-initio method. Global, hcp-, and fcc-restricted convex hulls are constructed to evaluate stable and metastable phases. It is found that fcc-L1 is energetically degenerate with hcp-B19. Both structures are unstable w ... [Appl. Phys. Lett. 99, 261902 (2011)] published Tue Dec 27, 2011. Controlling split-ring resonators with light http://link.aip.org/link/?APL/99/251914/1&agg=rss Polina V. Kapitanova, Stanislav I. Maslovski, Ilya V. Shadrivov, Pavel M. Voroshilov, Dmitry S. Filonov et al.<br/> We propose an original approach for creating tunable electromagnetic metamaterials. We demonstrate experimentally that magnetic resonance of a split-ring resonator (meta-atom of a composite material) with a photodiode operated in photovoltaic mode can be tuned by changing the intensity of an externa ... [Appl. Phys. Lett. 99, 251914 (2011)] published Fri Dec 23, 2011. Nucleation and propagation of voids in microbumps for 3 dimensional integrated circuits http://link.aip.org/link/?APL/99/251913/1&agg=rss Hsueh-Hsien Hsu, Shin-Yi Huang, Tao-Chih Chang, and Albert T. Wu<br/> The shrinking solder dimensions greatly impact the reliability of devices and increase entire failure modes. Limited solder volumes can be consumed completely and transformed into intermetallic compound (IMC) microbumps. Microvoids surface when microbumps are formed and may be attributed to a mismat ... [Appl. Phys. Lett. 99, 251913 (2011)] published Fri Dec 23, 2011. Optoelectronic behaviors and carrier dynamics of individual localized luminescent centers in InGaN quantum-well light emitting diodes http://link.aip.org/link/?APL/99/251911/1&agg=rss Suman De, Dibyendu Kumar Das, Arunasish Layek, Archana Raja, Manoj Kumar Singh et al.<br/> Spatially, spectrally, and temporally resolved photoluminescence (PL) microscopy was performed on InGaN quantum-well light emitting diodes to probe individual localized luminescent centers arising from disorder induced potential fluctuations. Two energetically distinct localization centers were iden ... [Appl. Phys. Lett. 99, 251911 (2011)] published Fri Dec 23, 2011. Interferometric scanning microscopy for the study of disordered materials http://link.aip.org/link/?APL/99/251912/1&agg=rss D. Kumar and M. M. J. Treacy<br/> We demonstrate an interferometric optical technique that probes pair-pair correlations in disordered materials. Fraunhofer diffraction patterns, using coherent double-probe illumination, exhibit Young's interference fringes whose strength is influenced by structural correlations between the two prob ... [Appl. Phys. Lett. 99, 251912 (2011)] published Fri Dec 23, 2011. Catalyst-free growth of high-optical quality GaN nanowires by metal-organic vapor phase epitaxy http://link.aip.org/link/?APL/99/251910/1&agg=rss X. J. Chen, B. Gayral, D. Sam-Giao, C. Bougerol, C. Durand et al.<br/> Catalyst-free GaN wires with 100200 nm diameters are grown on bare c-sapphire substrates by a metal-organic vapor phase epitaxy approach using both low V/III ratio and V-III precursor flows that favor a reaction-limited growth regime. The polarity control of the initial seeds allows obtaining pencil ... [Appl. Phys. Lett. 99, 251910 (2011)] published Thu Dec 22, 2011. Strain enhanced electron cooling in a degenerately doped semiconductor http://link.aip.org/link/?APL/99/251908/1&agg=rss M. J. Prest, J. T. Muhonen, M. Prunnila, D. Gunnarsson, V. A. Shah et al.<br/> Enhanced electron cooling is demonstrated in a strained-silicon/superconductor tunnel junction refrigerator of volume 40 [mu]m. The electron temperature is reduced from 300 mK to 174 mK, with the enhancement over an unstrained silicon control (300 mK258 mK) being attributed to the smaller electron-p ... [Appl. Phys. Lett. 99, 251908 (2011)] published Thu Dec 22, 2011. Observation of non-basal slip in semipolar InGaN/GaN heterostructures http://link.aip.org/link/?APL/99/251909/1&agg=rss Feng Wu, E. C. Young, I. Koslow, M. T. Hardy, P. S. Hsu et al.<br/> In this paper, we report on observations of the operation of secondary slip systems to relieve lattice mismatch stress in semipolar InGaN/GaN heterostructures. Two-dimensional arrays of misfit dislocations were observed. Consistent with previous reports, primary relaxation occurred along the project ... [Appl. Phys. Lett. 99, 251909 (2011)] published Thu Dec 22, 2011.