Materials Literature
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We present a self-consistent analysis of the photoemission spectral function A(k, w) of graphene monolayers grown epitaxially on SiC(0001). New information derived from spectral intensity anomalies (in addition to linewidths and peak positions) confirms that sizeable kinks in the electronic dispersion at the Dirac ene…
We present a method to analyze the metal-insulator transition (MIT) due to the band overlap mechanism. It is based on a model with the knowledge of the homogeneous electron gas, combined with results based on the quasiparticle self-consistent $GW$ method. Because of the long-range nature of the Coulomb interaction, th…
In this Letter, I study the magnetic response of electron wave functions in a commensurate collinear antiferromagnet. I show that, at a special set of momenta, hidden antiunitary symmetry protects Kramers degeneracy of Bloch eigenstates against a magnetic field, pointing transversely to staggered magnetization. Hence,…
We present a detailed theoretical analysis of the electron spin decoherence in single nitrogen-vacancy defects in ultrapure diamond. The electron spin decoherence is due to the interactions with $^{13}\text{C}$ nuclear spins in the diamond lattice. Our approach takes advantage of the low concentration (1.1%) of $^{13}…
We present a detailed calculation of intensities of two-phonon and four-phonon Raman peaks in graphene. Writing the low-energy Hamiltonian of the interaction of electrons with the crystal vibrations and the electromagnetic field from pure symmetry considerations, we describe the system in terms of just a few independe…
meso-Aryl-substituted [28]hexaphyrins(1.1.1.1.1.1) have been examined by (1)H, (13)C, and (19)F NMR spectroscopies, UV-vis absorption spectroscopy, magnetic circular dichroism spectroscopy, and single-crystal X-ray diffraction analysis. All of these data consistently indicate that [28]hexaphyrins(1.1.1.1.1.1) in solut…
In this study, a magnetic-sensitive microcapsule was prepared using Fe 3O 4/poly(allylamine) (Fe 3O 4/PAH) polyelectrolyte to construct the shell. Structural integrity, microstructural evolution, and corresponding release behaviors of fluorescence dyes and doxorubicin were systematically investigated. Experimental obs…
A crucial step in the development of implanted medical devices, in vivo diagnostics, and microarrays is the effective prevention of nonspecific protein adsorption from real-world complex media such as blood plasma or serum. In this work, a zwitterionic poly(carboxybetaine acrylamide) (polyCBAA) biomimetic material was…
Abstract Poly(ethylene terephthalate) (PET) sheets of different crystallinity were obtained by annealing. The annealed PET sheets were characterized by the density measurement, differential scanning calorimetry (DSC), ultraviolet (UV)‐visible spectrometry, X‐ray diffraction, and infrared (IR) spectrometry. The density…
Ballistic transport calculations, which are treated exactly within the nearest-neighbor tight-binding theory, on graphene strips connected to a pair of contacts are presented. In strips with high width-to-length ratio, the calculations reveal the presence of groups of resonances from a large number of nonequivalent co…
Abstract The microstructure and defects of the n = 2 Ruddlesden–Popper manganites La 2–2 x Ca 1+2 x Mn 2 O 7 ( x = 0.6, 0.8 and 0.9) were investigated by electron diffraction and high‐resolution transmission electron microscopy. Besides the predominant n = 2 layered structure in the examined compounds, intergrowths wi…
In this paper magnetic field induced strain (MFIS) of an antiferromagnetic γMn–Fe(Cu) is investigated. It is discovered that there is a high reversible MFIS of 1.6% with positive strain parallel to applied magnetic field at 3.8 T and ultimate negative strain of −0.15% at 1 T in the same way parallel to applied magneti…
Abstract The spherulitic morphology and growth, overall isothermal crystallization kinetics and hydrophilicity of PBSU were investigated by POM, DSC and WCA measurements in its miscible blends with PEO. The Hoffman‐Lauritzen equation was employed to analyze the spherulitic growth rates of neat and blended PBSU, which…
We study the formation of the InP on GaAsSb interface grown by molecular beam epitaxy at 450 °C. Using angle resolved x-ray photoemission spectroscopy (XPS), we show that Sb strongly segregates whereas As does not, leading to a Sb-rich InP surface. Similarly, XPS spectra recorded on air-exposed samples reveal oxidized…
Abstract Monomeric tungsten oxo‐aminoalkoxides W(O)(OPr i ) 3 (L) [L = O(CH 2 ) n NMe 2 ; n = 2 (dmae, 1) and 3 (dmap, 2 )] were synthesized by alcohol exchange with [W(O)(OPr i ) 4 ] 2 and characterized spectroscopically. 1, 2 and [W(O)(OPr i ) 4 ] 2 were used as precursors for the aerosol‐assisted chemical vapour de…
In this paper, hydrophobic carbon nanotube (CNT) arrays, ropes, and agglomerates were synthesized through self-organization on quartz substrates with different micro-structures under the same growth condition. On a flat substrate, a uniform woven structure was formed which resulted in a synchronous growth into an arra…
Silicon-based light-emitting devices can be produced by patterning commercial silicon wafers into microscale metal–insulator–semiconductor diodes. In this image, a silicon LED switches from IR (false color – left) to off (middle) to visible (right).
Si mittendrin: Si-dotierte Al44-Superatome bilden ein kubisch-primitives Kristallgitter (siehe Bild; • Al, • Si) in dem Cluster Si@Al56[N(Dipp)SiMe3]12 , der ausgehend von einer metastabilen AlCl-Lösung und dem Si-haltigen Liganden N(Dipp)SiMe3 hergestellt wurde (Dipp=2,6-iPr2C6H3). Das zentrale Si-Atom hat drastische…
Multicolored semiconductor quantum dots have shown great promise for construction of miniaturized light-emitting diodes with compact size, low weight and cost, and high luminescent efficiency. The unique size-dependent luminescent property of quantum dots offers the feasibility of constructing single-color or full-col…
A novel and promising technique for the fabrication of electro-optically active single crystalline organic waveguides from 2-{3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene}malononitrile (OH1) is presented. OH1 is an interesting material for photonic applications due to the large electro-optic coefficients (r333…