2010 NCN@Purdue Summer School: Electronics from the Bottom Up

18 Jan 2011 | Workshops

Electronics from the Bottom Up seeks to bring a new perspective to electronic devices – one that is designed to help realize the opportunities that nanotechnology presents.

https://nanohub.org/resources/8878

Additional Tutorials on Selected Topics in Nanotechnology

29 Mar 2011 | Workshops | Contributor(s): Gerhard Klimeck, Umesh V. Waghmare, Timothy S Fisher, N. S. Vidhyadhiraja

Select tutorials in nanotechnology, a part of the 2010 NCN@Purdue Summer School: Electronics from the Bottom Up.

https://nanohub.org/resources/11041

Analytical and Numerical Solution of the Double Barrier Problem

28 Jun 2010 | Teaching Materials | Contributor(s): Gerhard Klimeck, Parijat Sengupta, Dragica Vasileska

Tunneling is fully quantum-mechanical effect that does not have classical analog. Tunneling has revolutionized surface science by its utilization in scanning tunneling microscopes. In some device …

https://nanohub.org/resources/9231

Comparison of PCPBT Lab and Periodic Potential Lab

10 Aug 2009 | Online Presentations | Contributor(s): Abhijeet Paul, Samarth Agarwal, Gerhard Klimeck, Junzhe Geng

This small presentation provides information about the comparison performed for quantum wells made of GaAs and InAs in two different tools. This has been done to benchmark the results from completely …

https://nanohub.org/resources/7201

Exercise: Resonant Tunneling Diode

13 Jul 2011 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This is an exercise for resonant tunneling diode.

https://nanohub.org/resources/11654

Nanoelectronic Modeling Lecture 12: Open 1D Systems - Transmission through Double Barrier Structures - Resonant Tunneling

27 Jan 2010 | Online Presentations | Contributor(s): Gerhard Klimeck, Dragica Vasileska

This presentation shows that double barrier structures can show unity transmission for energies BELOW the barrier height, resulting in resonant tunneling. The resonance can be associated with a …

https://nanohub.org/resources/8195

Nanoelectronic Modeling Lecture 16: Introduction to RTDs - Realistic Doping Profiles

27 Jan 2010 | Online Presentations | Contributor(s): Gerhard Klimeck

Realistic RTDs need extremely high doping to provide enough carriers for high current densities. However, Impurity scattering can destroy the RTD performance. The dopants are therefore typically …

https://nanohub.org/resources/8199

Nanoelectronic Modeling Lecture 17: Introduction to RTDs - Relaxation Scattering in the Emitter

27 Jan 2010 | Online Presentations | Contributor(s): Gerhard Klimeck

Realistic RTDs will have nonlinear electrostatic potential in their emitter. Typically a triangular well is formed in the emitter due to the applied bias and the emitter thus contains discrete quasi …

https://nanohub.org/resources/8200

Nanoelectronic Modeling Lecture 18: Introduction to RTDs - Quantum Charge Self-Consistency (Hartree)

27 Jan 2010 | Online Presentations | Contributor(s): Gerhard Klimeck

In this semi-classical charge and potential model the quantum mechanical simulation is performed once and the quantum mechanical charge is in general not identical to the semi-classical charge.

https://nanohub.org/resources/8201

Nanoelectronic Modeling Lecture 19: Introduction to RTDs - Asymmetric Structures

27 Jan 2010 | Online Presentations | Contributor(s): Gerhard Klimeck

This lecture explores this effect in more detail by targeting an RTD that has a deliberate asymmetric structure. The collector barrier is chosen thicker than the emitter barrier. With this set-up …

https://nanohub.org/resources/8202

Nanoelectronic Modeling nanoHUB Demo 1: nanoHUB Tool Usage with RTD Simulation with NEGF

09 Mar 2010 | Online Presentations | Contributor(s): Gerhard Klimeck

Demonstration of running tools on the nanoHUB. Demonstrated is the RTD Simulation with NEGF Tool using a simple level-drop potential model and a more realistic device using a Thomas-Fermi potential …

https://nanohub.org/resources/8318

Nanoelectronic Modeling nanoHUB Demo 2: RTD simulation with NEGF

09 Mar 2010 | Online Presentations | Contributor(s): Gerhard Klimeck

Demonstration of resonant tunneling diode (RTD) simulation using the RTD Simulation with NEGF Tool with a Hartree potential model showing potential profile, charge densities, current-voltage …

https://nanohub.org/resources/8317

Nanoelectronic Modeling: Exercises 1-3 - Barrier Structures, RTDs, and Quantum Dots

27 Jan 2010 | Online Presentations | Contributor(s): Gerhard Klimeck

Exercises: Barrier Structures Uses: Piece-Wise Constant Potential Barrier Tool Resonant Tunneling Diodes Uses: Resonant Tunneling Diode Simulation with NEGF • Hartree calculation • …

https://nanohub.org/resources/8259

Nanoelectronic Modeling: From Quantum Mechanics and Atoms to Realistic Devices

25 Jan 2010 | Courses | Contributor(s): Gerhard Klimeck

The goal of this series of lectures is to explain the critical concepts in the understanding of the state-of-the-art modeling of nanoelectronic devices such as resonant tunneling diodes, quantum …

https://nanohub.org/resources/8086

Nanoelectronic Modeling: Multimillion Atom Simulations, Transport, and HPC Scaling to 23,000 Processors

07 Mar 2008 | Online Presentations | Contributor(s): Gerhard Klimeck

Future field effect transistors will be on the same length scales as “esoteric” devices such as quantum dots, nanowires, ultra-scaled quantum wells, and resonant tunneling diodes. In those …

https://nanohub.org/resources/3988

Nanotechnology Animation Gallery

22 Apr 2010 | Teaching Materials | Contributor(s): Saumitra Raj Mehrotra, Gerhard Klimeck

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. …

https://nanohub.org/resources/8882

PCPBT: Problem Assignment for Asymmetric Barriers

24 Jun 2009 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck

This example demonstrates to the students that for non-symmetric barriers which arise due to the imperfection of the molecular beam epitaxy process there is a reduction in the transmission …

https://nanohub.org/resources/7022

Piece-Wise Constant Potential Barrier Tool MATLAB Code

19 Jun 2010 | Downloads | Contributor(s): Dragica Vasileska, Gerhard Klimeck

this is the MATLAB code of the PCPBT in the effective mass approximation.

https://nanohub.org/resources/9203

Quantum Mechanics: Landauer's Formula

08 Jul 2008 | Series | Contributor(s): Dragica Vasileska, Gerhard Klimeck

When a metallic nanojunction between two macroscopic electrodes is connected to a battery, electrical current flows across it. The battery provides, and maintains, the charge imbalance between the …

https://nanohub.org/resources/4958

Resonant Tunneling Diode Simulation with NEGF: First-Time User Guide

20 May 2009 | Teaching Materials | 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 …

https://nanohub.org/resources/6791