Related Articles Quantum Hall effect on centimeter scale chemical vapor deposited graphene films Appl. Phys. Lett. 99, 232110 (2011) A transfer technique for high mobility graphene devices on commercially available hexagonal boron nitride Appl. Phys. Lett. 99, 232104 (2011) Low-temperature graphene growth using epochal catalyst of PdCo alloy Appl. Phys. Lett. 99, 223102 (2011) Synchrotron x-ray...

Transmission function through metallic armchair-edge graphene nanoribbons is calculated within non-equilibrium Green’s function method including full-band electron–opticalphonon interaction. Structures appear in transmission function, which are originated in both zone-center and zone-edge optical-phonon scattering.

Using first-principles calculations of graphene having high-symmetry distortion or defects, we investigate band gap opening by chiral symmetry breaking, or intervalley mixing, in graphene and show an intuitive picture of understanding the gap opening in terms of local bonding and antibonding hybridizations. We identify that the gap opening by chiral symmetry breaking in honeycomb lattices is an...

Graphene nanoribbons (GNRs) have received a great deal of attention due to their promise for electronic and optoelectronic applications. Several recent studies have focused on the synthesis of GNRs by the bottom-up approaches that could yield very narrow GNRs with atomically precise edges. One type of GNRs that has received a considerable attention is the chevron-like GNR with a very distinct p...

First-principle density functional theory calculations with quasiparticle corrections and many body effects are performed to study the electronic and optical properties of armchair graphene nanoribbons (AGNRs) with variant edges saturated by hydrogen atoms. The "effective width" method associated with the reported AGNR family effect is introduced to understand the electronic structures. The met...

A bottom-up approach toward stable and monodisperse segments of graphenes with a nitrogen-doped zigzag edge is introduced. Exemplified by the so far unprecedented dibenzo-9a-azaphenalene (DBAPhen) as the core unit, a versatile synthetic concept is introduced that leads to nitrogen-doped zigzag nanographenes and graphene nanoribbons.

To prepare nanosized graphene-like molecules of a defined structure (defined-width graphene nanoribbons or nanofragments) by a simple bottom-up method, thermal polymerization reactions of pentacenes were investigated. By optimizing heat treatment temperature and initial precursor weight, long-length fused pentacene molecules were successfully obtained at least up to octamer (n = 8). Here, the d...

We theoretically investigate resonant tunneling through S- and U-shaped nanostructured graphene nanoribbons. A rich structure of resonant tunneling peaks is found emanating from different quasi-bound states in the middle region. The tunneling current can be turned on and off by varying the Fermi energy. Tunability of resonant tunneling is realized by changing the width of the left and/or right ...

Generally, there are two distinct effects in modifying the properties of low-dimensional nanostructures: surface effect (SE) due to increased surface-volume ratio and quantum size effect (QSE) due to quantum confinement in reduced dimension. The SE has been widely shown to affect the elastic constants and mechanical properties of nanostructures. Here, we demonstrate that QSE can also have a str...

We present plasmonic devices, consisting of periodic arrays of graphene nanoribbons (GNRs) and a graphene sheet waveguide, to achieve controllable plasmon-induced transparency (PIT) by numerical simulation. We analyze the bright and dark elements of the GNRs and graphene-sheet waveguide structure. Results show that applying the gate voltage can electrically tune the PIT spectrum. Adjusting the ...