8 research outputs found
Comparison of thermal, mechanical and thermomechanical properties of poly(lactic acid) injection-molded into epoxy-based Rapid Prototyped (PolyJet) and conventional steel mold
Adsorbate-limited conductivity of graphene
We present a theory of electronic transport in graphene in the presence of randomly placed adsorbates. Our analysis predicts a marked asymmetry of the conductivity about the Dirac point, as well as a negative weak-localization magnetoresistivity. In the region of strong scattering, renormalization group corrections drive the system further towards insulating behavior. These results explain key features of recent experiments, and are validated by numerical transport computations
Advanced Simulation of Conductance Histograms Validated through Channel-Sensitive Experiments on Indium Nanojunctions
We demonstrate a self-contained methodology for predicting conductance histograms of atomic and molecular junctions. Fast classical molecular-dynamics simulations are combined with accurate density functional theory calculations predicting both quantum transport properties and molecular-dynamics force field parameters. The methodology is confronted with experiments on atomic-sized indium nanojunctions. Beside conductance histograms the distribution of individual channel transmission eigenvalues is also determined by fitting the superconducting subgap features in the I-V curves. The remarkable agreement in the evolution of the channel transmissions demonstrates that the simulated ruptures are able to reproduce a realistic statistical ensemble of contact configurations, whereas simulations on selected ideal geometries show strong deviations from the experimental observations
Bound states in inhomogeneous magnetic field in graphene:Semiclassical approach
We derive semiclassical quantization equations for graphene mono- and bilayer
systems where the excitations are confined by the applied inhomogeneous
magnetic field. The importance of a semiclassical phase, a consequence of the
spinor nature of the excitations, is pointed out. The semiclassical
eigenenergies show good agreement with the results of quantum mechanical
calculations based on the Dirac equation of graphene and with numerical tight
binding calculations.Comment: 8 pages, 7 figure