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Ripples and Warping of Graphene: A Theoretical Study
08 Jun 2010 | | Contributor(s):: Umesh V. Waghmare
We use first-principles density functional theory based analysis to understand formation of ripples in graphene and related 2-D materials. For an infinite graphene, we show that ripples are linked with a low energy branch of phonons that exhibits quadratic dispersion at long wave-lengths. Many...
Computer in Science Engineering: featuring nanoHUB.org
22 Apr 2010 |
The current issue of Computing in Science and Engineering focuses on cyber-enabled nanotechnology, and nanoHUB.org is featured extensively throughout.
Carbon nanotube bandstructure
22 Apr 2010 | | Contributor(s):: Saumitra Raj Mehrotra, Gerhard Klimeck
Carbon nanotubes are allotropes of carbon with a cylindrical nanostructure, and can be categorized into single-walled nanotubes (SWNT) and multi-walled nanotubes (MWNT). These cylindrical carbon molecules have novel properties that make them potentially useful in many nanotechnology...
Threshold voltage in a nanowire MOSFET
22 Apr 2010 | | Contributor(s):: Saumitra Raj Mehrotra, SungGeun Kim, Gerhard Klimeck
Threshold voltage in a metal oxide semiconductor field-effect transistor (better known as a MOSFET) is usually defined as the gate voltage at which an inversion layer forms at the interface between the insulating layer (oxide) and the substrate (body) of the transistor. A MOSFET is said to be...
Resonant Tunneling Diode operation
A resonant tunneling diode (RTD) is a type of diode with a resonant tunneling structure that allows electrons to tunnel through various resonant states at certain energy levels. RTDs can be fabricated using many different types of materials (such as III-V, type IV, II-VI semiconductors) and...
Nanotechnology Animation Gallery
Animations and visualization are generated with various nanoHUB.org tools to enable insight into nanotechnology and nanoscience. Click on image for detailed description and larger image download. Additional animations are also available Featured nanoHUB tools: Band Structure Lab. Carrier...
Comb Drive Levitation
19 Jan 2010 | | Contributor(s):: Fengyuan (Thomas) Li, jason clark
Model comb drive levitation effect with Schwarz-Christoffel based algorithm
Semiconductor Device Theory Exercises
out of 5 stars
30 Jul 2008 | | Contributor(s):: Dragica Vasileska, Gerhard Klimeck, Mark Lundstrom
This collection of problems should help the students to better understand Semiconductor Device Physics on a fundamental and more complex level. Crystal lattices and Miller indiciesFrom 1 well to 2 wells to 5 wells to periodic potentialsPeriodic potentials and bandstructureBandstructure...
Nanoelectronic Modeling Lecture 22: NEMO1D - Motivation, History and Key Insights
05 Feb 2010 | | Contributor(s):: Gerhard Klimeck
The primary objective of the NEMO-1D tool was the quantitative modeling of high performance Resonant Tunneling Diodes (RTDs). The software tool was intended for Engineers (concepts, fast turn-around, interactive) and Scientists (detailed device anaysis). Therefore various degrees of...
Nanoelectronic Modeling Lecture 03: nanoHUB.org - Online Simulation and More
30 Dec 2009 | | Contributor(s):: Gerhard Klimeck
This presentation provides a brief overview of the nanoHUB capabilites, compares it to static web page delivery, highlights its technology basis, and provides a vision for future cyberinfrastructures in a system of federated HUBs powered by the HUBzero.org infrastructure.
Nanoelectronic Modeling Lecture 02: (NEMO) Motivation and Background
30 Dec 2009 | | Contributor(s):: Gerhard Klimeck, Dragica Vasileska
Fundamental device modeling on the nanometer scale must include effect of open systems, high bias, and an atomistic basis. The non-equilibrium Green Function Formalism (NEGF) can include all these components in a fundamentally sound approach and has been the basis for a few novel device...
ECE 656 Lecture 31: Monte Carlo Simulation
24 Nov 2009 | | Contributor(s):: Mark Lundstrom
Outline:IntroductionReview of carrier scatteringSimulating carrier trajectoriesFree flightCollisionUpdate after collisionPutting it all togetherSummary
ECE 656 Lecture 30: Balance Equation Approach III
OutlineCarrier Temperature and Heat FluxBalance equations in 3DHeterostructuresSummary
Lecture 5: NEGF Simulation of Graphene Nanodevices
21 Sep 2009 | | Contributor(s):: Supriyo Datta
MOSFet Demonstration: MOSFET Device Simulation and Analysis
03 Jun 2009 | | Contributor(s):: Gerhard Klimeck, Benjamin P Haley
This video shows the simulation and analysis of a MOSFET device using the MOSFet tool. Several powerful analytic features of this tool are demonstrated.
OMEN Nanowire Demonstration: Nanowire Simulation and Analysis
This video shows the simulation and analysis of a nanowire using OMEN Nanowire. Several powerful analytic features of this tool are demonstrated.
NCN Nanomaterials: Simulation Tools for Research
02 Jun 2009 |
Resonant Tunneling Diode Simulation with NEGF: First-Time User Guide
20 May 2009 | | Contributor(s):: Samarth Agarwal, Gerhard Klimeck
This first-time user guide for Resonant Tunneling Diode Simulation with NEGF provides some fundamental concepts regarding RTDs along with details on how device geometry and simulation parameters influence current and charge distribution inside the device.NCN@Purdue
Nano-Plasmonic Bowtie Antenna Simulator
18 Mar 2008 | | Contributor(s):: Alexander S McLeod, Jeffrey B. Neaton, P. James Schuck, Eugene Song, Graham Chapman
A tool for simulating the near-field enhancement effects of nano-scale bowtie antennae.
ECE 612 Lecture 23: RF CMOS
02 Dec 2008 | | Contributor(s):: Mark Lundstrom
Outline: 1) Introduction,2) Small signal model,3) Transconductance,4) Self-gain,5) Gain bandwidth product,6) Unity power gain,7) Noise, mismatch, linearity…,8) Examples