1,721,269 research outputs found
Radio-Frequency Nanoelectronics – Bridging the Gap between Nanotechnology and R.F. Engineering Applications
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Multiphysics Modeling of the Electromagnetic/Coherent-Transport Phenomena in Graphene Nanodevices
No full textFull-Wave techniques for the analysis of electrodynamics and coherent quantum transport in graphene nanodevices
No full textWe report on full-wave techniques in the frequency (energy)-domain and the time-domain, aimed at the investigation of the combined electromagnetic-coherent transport problemin carbon based nanostructured materials and devices viz. graphene nanoribbons. The frequency-domain approach is introduced in order to describe a Poisson-Schrödinger/Dirac system in a quasi static framework. The time-domain approach deals with the full-wave solution of the combined Maxwell-Schrödinger/Dirac system of equations. From the above theoretical platforms, home-made solvers are provided, aimed at dealing with challenging problems in realistic devices/systems environments, typical of the area of radio-frequency nanoelectronic
Advanced modeling of the electrostatic field coupling in graphene nanoribbons
No full textThe field coupling of Graphene NanoRibbons (GNR), which is very important from the view point of realistic configurations/applications such as in field effect transistor, interconnects, plasmonic transmission lines, is analyzed and presented in this communication. We consider the quasi-static response of two GNRs coupled by Coulomb interaction : the Schrödinger equation in the two dimensional (2D) domain of the GNRs is solved togetherwith the three dimensional (3D) Poisson equation. It is observed that, unless the two GNRs are very close to each other, their Coulomb interaction is not so strong, in the sense that their charge and potential distributions are just slightly distorted by the presenceof the other GNR. The effect is even lower in the case of semimetallic GNRs, where the modulation of current and charge by external potential is known to be intrinsically small, owing to the absence of an energy band ga
Plane-Wave excitation and electromagnetic response of graphene : Non-linear effects
No full textIn graphene, the two-dimensional electrons and holes are described by the Dirac equation with a vanishing effective mass. As a consequence, under particular operative conditions, the electromagnetic response of graphene can be strongly nonlinear. We recently developed a method that accounts for deterministic electromagnetic field dynamics together with the quantum coherent transport in the nanoscale environment. We analyze the response of the system to harmonic plane wave and observe the frequency multiplication effect, resulting from the nonlinearity of the electromagnetic response. Theoretical results are compared with ones reported in the literatur
Time-Domain Multiphysics Modeling of the Electromagnetic-Transport Problem in Nanomaterials/Devices: a New Challenge in Computational Engineering
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Full-wave techniques for the multi-physics modeling and design of nano-structured devices
No full textFull-wave multiphysics techniques aimed at the investigation of the
combined electromagnetic-coherent transport phenomena in carbonbased
nano-structures/devices are presented.
Advanced numerical tools, in the frequency (energy)-domain and timedomain
and in multi-scale environment are derived. The quantum
transport is modeled by i) discrete Hamiltonians at atomistic scale, ii)
Schrödinger equation, and/or Dirac/Dirac-like eqs. at continuous level.
In the frequency-domain, a rigorous Poisson-coherent transport equation
system is provide
Frequency-domain Modeling of RF MEMS Switches
No full textWorkshop su Invito all'interno di IEEE IMS 2003, Philadelphia, Pennsylvania, US
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