The negative differential resistance (NDR) of resonant tunneling diodes (RTDs) enables their use in fast-switching applications and logic circuit designs. So far, RTDs have been realized in Si/SiGe or IIIV compound material systems. However, various emerging devices have been proposed and studied in the past two decades. Recently, graphene nanoribbons (GNRs) have attracted much attention as the...

Performance analysis of statistical samples of graphene nanoribbon tunneling transistors with line edge roughness" (2009). Birck and NCN Publications. Paper 392.

One-dimensional nanostructures of graphene such as graphene nanoribbons (GNRs) can prove attractive for digital electronics in the form of interband tunneling transistors, as they are capable of high drive currents. Here, we report on the transport properties of p-n junctions formed in GNR field effect transistors (FETs). It is found that the current density in the devices is indeed high; in th...

Using model interaction Hamiltonians for both electrons and phonons and Green's function formalism for ballistic transport, we have studied the thermal conductance and the thermoelectric properties of graphene nanoribbons (GNR), GNR junctions and periodic superlattices. Among our findings we have established the role that interfaces play in determining the thermoelectric response of GNR systems...

THE DEMAND for ever smaller, portable, energyefficient and high-performance electronic systems has been the primary driver for CMOS technology scaling. As CMOS scaling approaches physical limits, it has been fraught with challenges that required introduction of newer materials, manufacturing processes and device structures. High-κ oxide and metal-gate stack was introduced to mitigate oxide leak...

A graphene nanoribbon with armchair edges is known to have no edge state. However, if the nanoribbon is in the quantum spin Hall state, then there must be helical edge states. By folding a graphene ribbon into a ring and threading it by a magnetic flux, we study the persistent charge and spin currents in the tight-binding limit. It is found that, for a broad ribbon, the edge spin current appr...

We investigate the thermal conductivity in the armchair and zigzag MoS2 nanoribbons, by combining the non-equilibrium Green's function approach and the first-principles method. A strong orientation dependence is observed in the thermal conductivity. Particularly, the thermal conductivity for the armchair MoS2 nanoribbon is about 673.6 Wm(-1) K(-1) in the armchair nanoribbon, and 841.1 Wm(-1) K(...

Graphene's optical properties in the infrared and terahertz can be tailored and enhanced by patterning graphene into periodic metamaterials with sub-wavelength feature sizes. Here we demonstrate polarization-sensitive and gate-tunable photodetection in graphene nanoribbon arrays. The long-lived hybrid plasmon-phonon modes utilized are coupled excitations of electron density oscillations and sub...

We study by density functional and large scale tight-binding transport calculations the electronic structure, magnetism and transport properties of the recently proposed graphene ribbons with edges rolled to form nanotubes. Edges with armchair nanotubes present magnetic moments localized either in the tube or the ribbon and metallic or half-metallic character, depending on the symmetry of the j...