High-harmonic generation (HHG) in graphene heterostructures, consisting of metallic nanoribbons separated from a sheet by either few-nanometer layer aluminum oxide or an atomic monolayer hexagonal boron nitride, is investigated. The amplify the near-field at relative to externally applied pumping, thus allowing observation third- and fifth-harmonic carbon modest pump powers mid-infrared. depend...

Abstract In this paper, a wide bandwidth (20 GHz) and small sized (200 × 200 50 µm 3 ) terahertz (THz) square graphene ribbon antenna using Photonic Band Gap (PBG) substrate are investigated in the 0.6–0.8 THz band. The proposed consists of as radiating patch mounted on four types ground plane. important aim work is to eliminate second resonance frequency by utilize several plane keep single im...

nature nanotechnology | VOL 2 | APRIL 2007 | www.nature.com/naturenanotechnology 201 density of charge carriers is zero. Moreover, all the superconducting transistors made by the Delft group can support a supercurrent, making the ability to sustain a Josephson eff ect yet another robust feature of graphene. Th e development of commercial graphene-based nanoelectronics will encounter a number of...

to explore the possibility of using graphene based biosensor, adsorption of hydrogen peroxide on graphene has been investigated using density functional theory. the electronic properties of defect free and defective graphene in the presence of different number of hydrogen peroxide have been studied. the graphene with the most stable configuration defect named as sw defect is considered. the hig...

Graphite nanofibers, are a novel material that has been developed in our laboratory from the metal catalyzed decomposition of certain hydrocarbons (1). These structures possess a cross-sectional area that varies between 5 to 100 nm and have lengths ranging from 5 to 100 mm (2). High-resolution transmission electron microscopy studies have revealed that the nanofibers consist of extremely well-o...

Electronic structures of zigzag edged graphene nanoribbons (ZGNRs) doped with boron (B) or nitrogen (N) atoms are investigated by spin polarized first-principles calculations. We find that ZGNRs can be tuned to be either semiconducting, half-metallic, or metallic by controlling the distance of the impurity atoms to the edges. A new scheme is identified to achieve full half-metallicity in ZGNRs ...

PURPOSE Photoreceptor ribbon synapses translate light-dependent changes of membrane potential into graded transmitter release over several orders of magnitude in intensity. A specialized organelle at the active zone--the synaptic ribbon--is a key player in this process, and it is well known that the ribbon undergoes illumination and thus activity-dependent structural changes. However, the molec...

Quantum information science relies on quantum systems with sufficiently long coherence times. A spintronics implementation in graphene would benefit from the low density of nuclear spins in carbon and small spin-orbit interactions. The coupling of the spin to lattice dynamics puts an upper bound on spin coherence times. In addition, phonons in graphene are interesting due to the monatomic thick...