Materials Literature
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Transition metal oxides hold great potential for the development of new device paradigms because of the field-tunable functionalities driven by their strong electronic correlations, combined with their earth abundance and environmental friendliness. Recently, the interfaces between transition-metal oxides have reveale…
The DFT/vdW-WF method, recently developed to include the Van der Waals interactions in Density Functional Theory (DFT) using the Maximally Localized Wannier functions, is applied to the study of the adsorption of rare-gas atoms (Ne, Ar, Kr, and Xe) on the Cu(111) and Pb(111) surfaces, at three high-symmetry sites. We…
We demonstrate a new, nonlinear optical effect of electric currents. First, a steady current is generated by applying a voltage on a doped GaAs crystal. We demonstrate that this current induces second-harmonic generation of a probe laser pulse. Second, we optically inject a transient current in an undoped GaAs crystal…
We report a finite temperature micromagnetic method (FTM) that allows for the calculation of the coercive field of arbitrarily shaped magnetic nanostructures at time scales of nanoseconds to years. Instead of directly solving the Landau-Lifshitz-Gilbert equation, the coercive field is obtained without any free paramet…
Abstract In this work, we describe our efforts to produce Mn3O4–graphene nanocomposites based on a convenient andfeasible solution based synthetic route under mild conditions. According to transmission electron microscopy (TEM) and high angle annular dark field scanning transmission electron microscopy (HAADF‐STEM) re…
The multiplexed detection of biological analytes from complex mixtures is of crucial importance for the future of intelligent management and detection of disease. This review focuses on recent advances in the use of surface enhanced Raman scattering (SERS) spectroscopy as an analytical technique that can deliver multi…
Electric double-layer supercapacitors (SCs) are promising devices for high-power energy storage based on the reversible absorption of ions into porous conducting electrodes. Graphene is a particularly good candidate for the electrode material in SCs due to its high conductivity and large surface area. In this paper, w…
The morphology of TiO 2 nanotubes with nanowires directly formed on top (designed as TiO 2 NTWs) would be a promising nanostructure in fabricating photoelectrochemical solar cells for its advantages in charge separation, electronic transport, and light harvesting. In this study, a TiO 2 NTWs array film was prepared by…
In ordinary dielectrics, the dynamical matrix at the zone center in general is a nonanalytic function of degree zero in the wave vector $\mathbf{q}$. Its expression (for a crystal of arbitrary symmetry) is well known and is routinely implemented in first-principles calculations. The nonanalytic behavior occurs in pola…
The two most common types of MgB2conductor fabrication technique –in-situandex-situ– show increasing conflicts concerning the connectivity, an effective current-carrying cross-sectional area. Anin-situreaction yields a strong intergrain coupling with a low packing factor, while anex-situprocess using pre-reacted MgB2y…
The anisotropic irreversibility field ${B}_{Irr}$ of two YBa${}_{2}$Cu${}_{3}$O${}_{7\ensuremath{-}\mathrm{x}}$ thin films doped with additional rare earth (RE) $=$ (Gd, Y) and Zr and containing strong correlated pins (splayed BaZrO${}_{3}$ nanorods and RE${}_{2}$O${}_{3}$ nanoprecipitates) has been measured over a ve…
We investigate the fast-reaction asymptotics for a one-dimensional reaction-diffusion (RD) system describing the penetration of the carbonation reaction in concrete. The technique of matched-asymptotics is used to show that the RD system leads to two distinct classes of sharp-interface models, that correspond to diffe…
Rare-earth ($R$) half-Heusler compounds $R$BiPt exhibit a wide spectrum of interesting ground states. We have employed x-ray resonant magnetic scattering to elucidate the microscopic details of the magnetic structure in GdBiPt below ${T}_{N}=8.5$ K. Experiments at the Gd ${L}_{2}$ absorption edge show that the Gd mome…
This is a technical note aiming at the re-examination of the phenomenon of the steady-state cracking in the two-layer system. The method of Suo and Hutchinson, as introduced in their 1989 paper, is followed. Our solution is compared with the one appearing in that paper for the substrate-to-film thickness ratio $λ_0=10…
The excited holes occupying the valence band tail states in amorphous oxide semiconductors are found to induce formation of meta-stable O$_2^{2-}$ peroxide defects. The valence band tail states are at least partly characterized by the O-O ppσ* molecular orbital, and the localized-hole-mediated lattice instability resu…
In this article, based on first-principles calculations, we systematically study functionalization induced diamonization of graphene bilayer and graphene-BN hybrid bilayer. With single-side functionalization, the diamondized structures are magnetic semiconductor. Interestingly, if both sides of the bilayer are functio…
In this paper we will investigate how one can create emergent curved spacetimes by locally tuning the coupling constants of condensed matter systems. In the continuum limit we thus obtain continuous effective quantum fields living on curved spacetimes. In particular, using Stingnet condensates we can obtain effective…
A combination of neutron total scattering measurement and reverse Monte Carlo (RMC) refinement is applied to the study of apical Cu-O bond distortions in the high-Tc superconductor YBa2Cu3O6.93. We show that the average structure is not consistent with a split-site model for the corresponding Cu and O positions, but t…
Abstract Cell and tissue engineering therapies for regenerative medicine as well as cell‐based assays require an understanding of the interactions between cells with the surrounding microenvironment at the nanoscale. Engineering a cell‐interactive scaffold therefore entails control over the nanostructure of the biomat…
We report the first observation of the n-type nature of hydrogenated graphene on SiO(2) and demonstrate the conversion of the majority carrier type from electrons to holes using surface doping. Density functional calculations indicate that the carrier type reversal is directly related to the magnitude of the hydrogena…