Materials Literature
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Development of new methodology for the preparation of functional polymers with practical applications is a fundamental important research area in macromolecular science. In this paper, a new polymerization route for the synthesis of functional polymers is developed. The three-component polycoupling reactions of diynes…
Materials integration in heterostructures with novel properties different from those of the constituents has become one of the most powerful concepts of modern materials science. Two-dimensional (2D) crystals represent a new class of materials from which such engineered structures can be envisioned. Calculations have…
The combination of nonsolvent-induced phase separation and the self-assembly of block copolymers can lead to asymmetric membranes with a thin highly ordered isoporous skin layer. The effective pore size of such membranes is usually larger than 15 nm. We reduced the pore size of these membranes by electroless gold depo…
The interplay of massive electrons with spin-orbit coupling in bulk graphene results in a spin-valley dependent gap. Thus, a barrier with such properties can act as a filter, transmitting only opposite spins from opposite valleys. In this Letter we show that a strain induced pseudomagnetic field in such a barrier will…
Antiphase domain boundaries (APDBs) in the $(n\ifmmode\times\else\texttimes\fi{}1)(n=4,5)$ reconstructions of the ${\mathrm{SrTiO}}_{3}(110)$ surface were studied with scanning tunneling microscopy, x-ray photoemission spectroscopy, and density functional theory (DFT) calculations. Two types of APDBs form on each reco…
In this paper we give a detailed analysis of the expected sensitivity and operating conditions in the power detection mode of a hot-electron bolometer (HEB) made from a few {\mu}m$^2$ of monolayer graphene (MLG) flake which can be embedded into either a planar antenna or waveguide circuit via NbN (or NbTiN) supercondu…
We test the performance of a number of two- and one-parameter double-hybrid approximations, combining semilocal exchange-correlation density functionals with periodic local second-order Møller-Plesset (LMP2) perturbation theory, for calculating lattice energies of a set of molecular crystals: urea, formamide, ammonia,…
The lattice dynamics of ${\mathrm{Ba}}_{2}\mathrm{Cu}{\mathrm{Ge}}_{2}{\mathrm{O}}_{7}$, a compound which develops Dzyaloshinsky-Moriya helical magnetism below ${T}_{N}=3.2$ K, has been studied by measuring the infrared reflectivity of a single crystal with the radiation polarized both in the $ab$ plane and along the…
We employ molecular dynamics simulations of nanolayered polymers to systematically quantify the dependence of T g nanoconfinement effects on interfacial energy and the “softness” of confinement. Results indicate that nanoconfined T g depends linearly on interfacial adhesion energy, with a slope that scales exponential…
Recently, this long-sought quantum anomalous Hall effect was realized in the magnetic topological insulator. However, the requirement of an extremely low temperature (approximately 30 mK) hinders realistic applications. Based on \textit{ab-initio} band structure calculations, we propose a quantum anomalous Hall platfo…
We investigate a magnetic proximity effect on Dirac surface states of topological insulator (TI) induced by a Bi$_2$Se$_3$/EuS interface, using density-functional theory (DFT) and a low-energy effective model, motivated by a recent experimental realization of the interface. We consider a thin ferromagnetic insulator E…
The nucleation of reversed magnetic domains in Pt/Co/AlO(x) microstructures with perpendicular anisotropy was studied experimentally in the presence of an in-plane magnetic field. For large enough in-plane field, nucleation was observed preferentially at an edge of the sample normal to this field. The position at whic…
We report nanocrystalline carbon impurities coexisting with graphene synthesized via chemical vapor deposition on platinum. For certain growth conditions, we observe micron-size island-like impurity layers which can be mistaken for second graphene layers in optical microscopy or scanning electron microscopy. The islan…
Deterministic control of domain walls orthogonal to the direction of current flow is demonstrated by exploiting spin orbit torque in a perpendicularly polarized Ta/CoFeB/MgO multilayer in presence of an in-plane magnetic field. Notably, such orthogonal motion with respect to current flow is not possible from tradition…
We have experimentally investigated the expansion mechanism induced by laser irradiation of H2SO4 intercalated graphite. Intercalated graphite materials irradiated by laser allows to study reactions occurring in confined chemical conditions. We find that the laser-assisted reaction process is characterized by a thresh…
Electron injection from the tip of a scanning tunneling microscope into a p-type GaAs(110) surface have been used to induce luminescence in the bulk. Atomically-resolved photon maps revealed significant reduction of luminescence intensity at surface states localized near Ga atoms. Quantitative analysis based on the fi…
The results of heat capacity ${C}_{\mathrm{p}}(T,H)$ and electrical resistivity $\ensuremath{\rho}(T,H)$ measurements down to 0.35 K as well as muon spin relaxation and rotation $(\ensuremath{\mu}\mathrm{SR})$ measurements on the noncentrosymmetric superconductor ${\mathrm{LaIrSi}}_{3}$ are presented. Powder neutron d…
We investigate the optical excitation spectra and the photoluminescence depolarization dynamics in bilayer ${\mathrm{WS}}_{2}$. A different understanding of the optical excitation spectra in the recent photoluminescence experiment by Zhu et al. (arXiv:1403.6224) in bilayer ${\mathrm{WS}}_{2}$ is proposed. In the exper…
In the density-functional studies of materials with localized electronic states, the local/semilocal exchange-correlation functionals are often either combined with a Hubbard parameter U as in the LDA+U method or mixed with a fraction of exactly computed (Fock) exchange energy yielding a hybrid functional. Although so…
We have developed a hierarchical nano-porous layer (HNL) on a silicate glass by simple alkaline etching method. The HNL has a three-dimensionally-continuous sponge-like structure with a pore size of a few tens of nm at its apparent surface. The pore size gradually decreases from the apparent surface to the interface o…