Materials Literature
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While electron spins in silicon heterostructures make attractive qubits, little is known about the coherence of electrons at the Si/SiO2 interface. We report spin relaxation (T1) and coherence (T2) times for mobile electrons and natural quantum dots at a 28Si/SiO2 interface. Mobile electrons have short T1 and T2 of 0.…
We report the fabrication and study of Hall bar MOSFET devices in which an overlapping-gate architecture allows four-terminal measurements of low-density 2D electron systems, while maintaining a high density at the ohmic contacts. Comparison with devices made using a standard single gate show that measurements can be…
We used time-resolved Kerr rotation technique to study the electron spin coherence in a comprehensive set of bulk CdTe samples with various concentrations of electrons that were supplied by n-type doping. The electron spin coherence time of 40 ps was observed at temperature of 7 K in p-type CdTe and in n-type CdTe wit…
Solvent structure and dynamics of acetonitrile at its liquid-vapor (LV) interface and at the acetonitrile-silica (LS) interface are studied by means of molecular dynamics simulations. We set up the interfacial system and treat the long-ranged electrostatics carefully to obtain both stable LV and LS interfaces within t…
The effect of K and K-Na substitution for Pb atoms in the rocksalt lattice of PbTe was investigated to test a hypothesis for development of resonant states in the valence band that may enhance the thermoelectric power. We combined high-temperature Hall-effect, electrical conductivity, and thermal conductivity measurem…
Semiconductor quantum dots (QDs) and their assemblies have shown potential research interest due to their size dependent optical and electronic properties. Laser irradiation of larger sized semiconductor nanoparticles (NPs) suspended into liquid media is an easy, quick, versatile, environmental friendly, and rapidly g…
We have revisited the magnetic structure of manganese phosphorus trisulfide ${\text{MnPS}}_{3}$ using neutron diffraction and polarimetry. ${\text{MnPS}}_{3}$ undergoes a transition toward a collinear antiferromagnetic order at 78 K. The resulting magnetic point-group breaks both the time reversal and the space invers…
Scientific advances have significantly improved the practice of medicine by providing objective and quantitative means for exploring the human body and disease states. These innovative technologies have already profoundly improved disease detection, imaging, treatment and patient follow-up. Todays analytical limits ar…
We determined the methane (CH(4)) uptake (at 298 K and 1 to 100 bar pressure) for a variety of covalent organic frameworks (COFs), including both two-dimensional (COF-1, COF-5, COF-6, COF-8, and COF-10) and three-dimensional (COF-102, COF-103, COF-105, and COF-108) systems. For all COFs, the CH(4) uptake was predicted…
Presented is an extension of the CHARMM additive carbohydrate all-atom force field to enable modeling of polysaccharides containing furanose sugars. The new force field parameters encompass 1 ↔ 2, 1 → 3, 1 → 4, and 1 → 6 pyranose-furanose linkages and 2 → 1 and 2 → 6 furanose-furanose linkages, building on existing he…
Controlling nanoparticles with atomic precision, somewhat like the way organic chemists control small molecules by organic chemistry principles, is highly desirable for nanoparticle chemists. Recent advances in the synthesis of gold nanoparticles have opened the possibility to precisely control the number of gold atom…
Since graphene has no band gap, photoluminescence is not expected from relaxed charge carriers. We have, however, observed significant light emission from graphene under excitation by ultrashort (30-fs) laser pulses. Light emission was found to occur across the visible spectral range (1.7-3.5 eV), with emitted photon…
This review is an attempt to illustrate the different alternatives in the field of 2D materials. Graphene seems to be just the tip of the iceberg and we show how the discovery of alternative 2D materials is starting to show the rest of this iceberg. The review comprises the current state-of-the-art of the vast literat…
Heat generation in silicide stripes is studied using scanning thermal expansion microscopy. Local hot spots in the lithographically patterned silicide stripes can be imaged with high spatial resolution (around 20 nm). On the micrometer scale the enhancement of temperature can be linked to pronounced depressions appear…
When a molecule adsorbs to the surface of a carbon-based nanostructure the local binding potential and the molecule mass determine the natural characteristic frequency with which it vibrates after being slightly perturbed from its equilibrium position. We perform phonon-assisted inelastic quantum transport calculation…
Abstract Non‐covalent functionalization of carbon nanotubes (CNTs) by polymers or aromatic systems is a rapidly emerging field. Its importance originates in the possibility of combining special (optical, electric, or dispersive) properties of the added molecules with the mechanical stability of nanotubes. A special ap…
Polar fluctuations were found in KTaO3 when K+ was substituted with Mn2+ on the A-site. The temperature dependence of the real part of the dielectric permittivity of (K1−2xMnx◻x)TaO3 ceramics (x=0–0.05) shows a diffuse maximum between 50–100 K in the frequency range 102–106 Hz, shifting to higher temperature with incr…
Nanoparticles with multiple ligands have been proposed for use in nanomedicine. The multiple targeting ligands on each nanoparticle can bind to several locations on a cell surface facilitating both drug targeting and uptake. Experiments show that the distribution of conjugated ligands is unexpectedly broad, and the de…
Light absorption inside the grooves of metallic gratings filled with a semiconductor material can be improved by means of the electric field enhancement. To this end, the influence of grating dimensions in the electric field spectral behavior is theoretically investigated. Two conditions of cavity resonance have been…
The surface stress associated with the underpotential deposition (upd) of thallium (Tl) on (111)-textured Au is examined, using the wafer curvature method in acidic perchlorate supporting electrolyte. The process is also examined by independent nanogravimetric measurements using an electrochemical quartz crystal nanob…