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Unified bandgap engineering, valid both for the armchair and zigzag graphene nanoribbons (GNRs), is enunciated. Using the boundary condition appropriate for K–K′ points of the Dirac cones, GNRs are shown to exhibit three distinct semiconducting states SC0, SC1, and SC2 with complete absence of metallic state. The experimental bandgap for 7‐AGNR and 13‐AGNR armchair (A) is found to be in excellent...
Drift response to a high electric field in graphene and carbon nanotubes (CNTs) is delineated using nonequilibrium Arora distribution function (NEADF), a paradigm that is distinctly different from that using the nonequilirium Green function and other theoretical paradigms. In this formalism, the re-organization of randomly oriented velocity vectors is shown to streamline and become unidirectional...
In this study, the carrier statistics in a carbon nanotube (CNT) with nonparabolic energy spectrum is investigated to predict the ultimate (intrinsic) drift velocity as a function of temperature, concentration, and chirality. The average of the magnitude of the velocity is the intrinsic velocity vi. vi for random motion is the weighted average of v=(1/h)(dE / dk) with weight as the product of the...
The charge carriers in nanowires (NWs), carbon nanotubes (CNTs), and those confined to a very high magnetic field have one-dimensional (1D) character as quasi-free propagation of electron waves with analog energy spectrum exists only in one direction. The energy spectrum is quantum (or digital) in other two cartesian directions where electron waves are standing waves. In the quantum limit, an electron...
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