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Quantum Dots

4.5 out of 5 stars

21 Jul 2005 | Online Presentations | Contributor(s): Gerhard Klimeck

Quantum Dots are man-made artificial atoms that confine electrons to a small space. As such, they have atomic-like behavior and enable the study of quantum mechanical effects on a length scale that is around 100 times larger than the pure atomic scale. Quantum dots offer application opportunities...

Thermoelectric effects in semiconductor nanostructures: Role of electron and lattice properties

0.0 out of 5 stars

29 Sep 2010 | Online Presentations | Contributor(s): Abhijeet Paul, Gerhard Klimeck

This presentation covers some aspects of present development in the field of thermoelectricity and focuses particularly on the silicon nanowires as potential thermoelectric materials. The electronic and phonon dispersions are calculated and used for the calculation of thermoelectric properties in...

Bandstructure in Nanoelectronics

5.0 out of 5 stars

01 Nov 2005 | Online Presentations | Contributor(s): Gerhard Klimeck

This presentation will highlight, for nanoelectronic device examples, how the effective mass approximation breaks down and why the quantum mechanical nature of the atomically resolved material needs to be included in the device modeling. Atomistic bandstructure effects in resonant tunneling...

Why is Nanotechnology Multidisciplinary? A perspective of one EE

19 Oct 2006 | Online Presentations | Contributor(s): Gerhard Klimeck

The field of nano science and nano-technology covers broad areas of expertise. Classical fields of Physics, Chemistry, Material Science, Electrical/Mechanical/Chemical Engineering all are involved in the "new" field. Nano research and development is therefore multidisciplinary. This presentation...

Introduction to Quantum Dot Lab

31 Mar 2008 | Online Presentations | Contributor(s): Sunhee Lee, Hoon Ryu, Gerhard Klimeck

The nanoHUB tool "Quantum Dot Lab" allows users to compute the quantum mechanical "particle in a box" problem for a variety of differentconfinement shapes, such as boxes, ellipsoids, disks, and pyramids. Users can explore, interactively, the energy spectrum and orbital shapes of new quantized...

Numerical Aspects of NEGF: The Recursive Green Function Algorithm

14 Jun 2004 | Online Presentations | Contributor(s): Gerhard Klimeck

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

25 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 quasi bound state, and the bound state can be related to a simple particle in a box calculation.

ECE 606 Lecture 25: Modern MOSFETs

03 Dec 2012 | Online Presentations | Contributor(s): Gerhard Klimeck

ECE 606 Lecture 1: Introduction/Crystal Classification

30 Aug 2012 | Online Presentations | Contributor(s): Gerhard Klimeck

Nanoelectronic Modeling Lecture 01: Overview

30 Dec 2009 | Online Presentations | 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 wells, quantum dots, nanowires, and ultra-scaled transistors. Three fundamental concepts critical to...

HPC and Visualization for multimillion atom simulations

21 Jun 2005 | Online Presentations | Contributor(s): Gerhard Klimeck

This presentation gives an overview of the HPC and visulaization efforts involving multi-million atom simulations for the June 2005 NSF site visit to the Network for Computational Nanotechnology.

ECE 606 Lecture 2: Quantum Mechanics

31 Aug 2012 | Online Presentations | Contributor(s): Gerhard Klimeck

ECE 606 Lecture 20: Heterojunction Bipolar Transistor

02 Nov 2012 | Online Presentations | Contributor(s): Gerhard Klimeck

ECE 606 Lecture 5: Density of States

27 Sep 2012 | Online Presentations | Contributor(s): Gerhard Klimeck

Nanoelectronic Modeling Lecture 21: Recursive Green Function Algorithm

05 Feb 2010 | Online Presentations | Contributor(s): Gerhard Klimeck

The Recursive Green Function (RGF) algorithms is the primary workhorse for the numerical solution of NEGF equations in quasi-1D systems. It is particularly efficient in cases where the device is partitioned into reservoirs which may be characterized by a non-Hermitian Hamiltonian and a central...

NEMO 1-D: The First NEGF-based TCAD Tool and Network for Computational Nanotechnology

28 Dec 2004 | Online Presentations | Contributor(s): Gerhard Klimeck

Nanotechnology has received a lot of public attention since U.S. President Clinton announced the U.S.National Nanotechnology Initiative. New approaches to applications in electronics, materials,medicine, biology and a variety of other areas will be developed in this new multi-disciplinary...

Nanoelectronic Modeling Lecture 11: Open 1D Systems - The Transfer Matrix Method

30 Dec 2009 | Online Presentations | Contributor(s): Gerhard Klimeck, Dragica Vasileska, Samarth Agarwal, Parijat Sengupta

The transfer matrix approach is analytically exact, and “arbitrary” heterostructures can apparently be handled through the discretization of potential changes. The approach appears to be quite appealing. However, the approach is inherently unstable for realistically extended devices which exhibit...

Nanoelectronic Modeling Lecture 28: Introduction to Quantum Dots and Modeling Needs/Requirements

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

This presentation provides a very high level software overview of NEMO1D.Learning Objectives:This lecture provides a very high level overview of quantum dots. The main issues and questions that are addressed are:Length scale of quantum dotsDefinition of a quantum dotQuantum dot examples and...

NEMO5 Overview Presentation

17 Jul 2012 | Online Presentations | Contributor(s): Tillmann Christoph Kubis, Michael Povolotskyi, Jean Michel D Sellier, James Fonseca, Gerhard Klimeck

This presentation gives an overview of the current functionality of NEMO5.

Your Career Choices after Graduate School and The Most-Neglected Item in your Career Development (2015)

23 Oct 2009 | Online Presentations | Contributor(s): Gerhard Klimeck

What are your career choices after graduate school? Will you develop technology yourself? Will you work in a team? Will you guide people? Where will you work: in industry, research lab, or academia? Regardless where you work, there is generally one item that you are not being taught in graduate...

Nanoelectronic Modeling Lecture 09: Open 1D Systems - Reflection at and Transmission over 1 Step

30 Dec 2009 | Online Presentations | Contributor(s): Gerhard Klimeck, Dragica Vasileska, Samarth Agarwal

One of the most elemental quantum mechanical transport problems is the solution of the time independent Schrödinger equation in a one-dimensional system where one of the two half spaces has a higher potential energy than the other. The analytical solution is readily obtained using a scattering...

Nanoelectronic Modeling Lecture 02: (NEMO) Motivation and Background

30 Dec 2009 | Online Presentations | 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 606 Lecture 19: Bipolar Transistors Design

Nanoelectronic Modeling Lecture 40: Performance Limitations of Graphene Nanoribbon Tunneling FETS due to Line Edge Roughness

08 Jul 2010 | Online Presentations | Contributor(s): Gerhard Klimeck, Mathieu Luisier

This presentation the effects of line edge roughness on graphene nano ribbon (GNR) transitors..Learning Objectives:GNR TFET Simulation pz Tight-Binding Orbital Model 3D Schrödinger-Poisson Solver Device Simulation Structure Optimization (Doping, Lg, VDD) LER => Localized Band Gap States LER =>...

Nanoelectronic Modeling Lecture 20: NEGF in a Quasi-1D Formulation

25 Jan 2010 | Online Presentations | Contributor(s): Gerhard Klimeck, Samarth Agarwal, Zhengping Jiang

This lecture will introduce a spatial discretization scheme of the Schrödinger equation which represents a 1D heterostructure like a resonant tunneling diode with spatially varying band edges and effective masses.