Electrostatically doped graphene p-n junctions can be formed by applying large source-drain and source-gate biases to a graphene field-effect transistor, which results in trapped charges in part of the channel gate oxide. We measure the temperature distribution in situ during the electrical stress and characterize the resulting p-n junctions by Raman spectroscopy and photocurrent microscopy. Doping levels, the size of the doped graphene segments, and the abruptness of the p-n junctions are all extracted. Additional voltage probes can limit the length of the doped segments by acting as heat sinks. The spatial location of the identified potential steps coincides with the position where a photocurrent is generated, confirming the creation of p-n junctions.

Modeling charge transport in graphene nanoribbons and carbon nanotubes using a Schrödinger-Poisson solverWe report on the electromechanical robustness of graphene in an extreme condition of deformation: uniaxial bending. A large-angle-bent graphene monolayer was obtained with a predefined template. Structural/mechanical analysis is conducted, followed by electronic transport measurement. Raman spectroscopy analysis suggests negligible strain in the significantly bent graphene, showing mechanical robustness of the two-dimensional carbon nanostructure. The impact on band structure with respect to key deformation parameters ͑bending angle and curvature radius͒ were investigated using sp 3 tight-binding simulation. Results show insignificant local band modification at bending locations. Even with extreme deformation, excellent carrier mobility in monolayer graphene is preserved.

Myiasis is the invasion of tissues and organs of human beings or other vertebrates by fly larvae. This phenomenon is well documented in the skin, especially among animals and people in tropical and subtropical areas.When tissues of the oral cavity are invaded by the parasitic larvae of flies, this condition is called oral myiasis. Oral myiasis is a rare condition that can be caused by several species of dipteran fly larvae and may be secondary to serious medical conditions. We hereby report a rare case of oral myiasis involving the palate in a 58-year-old diabetic patient and discuss the management of the same.

A test was made of the ability of Kramers-Kronig-constrained variational dielectric fitting to extract the optical conductivity of a thin film from reflectance data containing structure due to both thin film and substrate. The reflectance of a series of well-characterized thin films of SrRu(x)Mg(1-x)O(3) and SrRu(x)O(3) with a variety of thicknesses (approximately 56-300 nm) and dc resistivities (approximately 250-2200 micro Omega cm) was measured. The low frequency values of the extracted optical conductivities agree with the dc measurements, however, removal of features due to the substrate improves with increasing film thickness.