
Tutorial 4c: Formation of Bandstructure in Finite Superlattices (Exercise Session)
29 Mar 2011   Contributor(s):: Gerhard Klimeck
How does bandstructure occur? How large does a repeated system have to be? How does a finite superlattice compare to an infinite superlattice?

Tutorial 4d: Formation of Bandstructure in Finite Superlattices (Exercise Demo)
29 Mar 2011   Contributor(s):: Gerhard Klimeck
Demonstration of thePieceWise Constant Potential Barriers Tool.

Nanoelectronic Modeling Lecture 41: FullBand and Atomistic Simulation of Realistic 40nm InAs HEMT
05 Aug 2010   Contributor(s):: Gerhard Klimeck, Neerav Kharche, Neophytos Neophytou, Mathieu Luisier
This presentation demonstrates the OMEN capabilities to perform a multiscale simulation of advanced InAsbased high mobility transistors.Learning Objectives:Quantum Transport Simulator FullBand and Atomistic IIIV HEMTs Performance Analysis Good Agreement with Experiment Some Open Issues...

Nanoelectronic Modeling Lecture 35: Alloy Disorder in Nanowires
05 Aug 2010   Contributor(s):: Gerhard Klimeck, Timothy Boykin, Neerav Kharche, Mathieu Luisier, Neophytos Neophytou
This presentation discusses the consequences of Alloy Disorder in unstrained strained AlGaAs nanowiresRelationship between dispersion relationship and transmission in perfectly ordered wiresBand folding in Si nanowiresTranmisison in disordered wires – relationship to an approximate...

Nanoelectronic Modeling Lecture 34: Alloy Disorder in Quantum Dots
05 Aug 2010   Contributor(s):: Gerhard Klimeck, Timothy Boykin, Chris Bowen
This presentation discusses the consequences of Alloy Disorder in strained InGaAs Quantum Dots Reminder of the origin of bandstructure and bandstructure engineeringWhat happens when there is disorder?Concept of disorder in the local bandstructureConfiguration noise, concentration noise,...

Nanoelectronic Modeling Lecture 33: Alloy Disorder in Bulk
04 Aug 2010   Contributor(s):: Gerhard Klimeck, Timothy Boykin, Chris Bowen
This presentation discusses disorder in AlGaAs unstrained systems in bulk. Bandstructure of an ideal simple unit cellWhat happens when there is disorder?Concept of a supercellBand folding in a supercellBand extraction from the concept of approximate bandstructureComparison of alloy disorder...

Thermoelectric Nanotechnology
27 Jul 2010   Contributor(s):: Mark Lundstrom
his talk is an undergraduate level introduction to the field. After a brief discussion of applications, the physics of the Peltier effect is described, and the Figure of Merit (FOM), ZT, which controls the efficiency of a thermoelectric refrigerator or electric power generator, is discussed. The...

Nanoelectronic Modeling Lecture 25a: NEMO1D  Full Bandstructure Effects
07 Jul 2010   Contributor(s):: Gerhard Klimeck
(quantitative RTD modeling at room temperature)

Ripples and Warping of Graphene: A Theoretical Study
08 Jun 2010   Contributor(s):: Umesh V. Waghmare
We use firstprinciples density functional theory based analysis to understand formation of ripples in graphene and related 2D materials. For an infinite graphene, we show that ripples are linked with a low energy branch of phonons that exhibits quadratic dispersion at long wavelengths. Many...

Nanoelectronic Modeling Lecture 25b: NEMO1D  Hole Bandstructure in Quantum Wells and Hole Transport in RTDs
09 Mar 2010   Contributor(s):: Gerhard Klimeck
Heterostructures such as resonant tunneling diodes, quantum well photodetectors and lasers, and cascade lasers break the symmetry of the crystalline lattice. Such break in lattice symmetry causes a strong interaction of heavy, light and splitoff hole bands. The bandstructure of holes and the...

Nanoelectronic Modeling Lecture 26: NEMO1D 
09 Mar 2010   Contributor(s):: Gerhard Klimeck
NEMO1D demonstrated the first industrial strength implementation of NEGF into a simulator that quantitatively simulated resonant tunneling diodes. The development of efficient algorithms that simulate scattering from polar optical phonons, acoustic phonons, alloy disorder, and interface...

Nanoelectronic Modeling: Exercises 13  Barrier Structures, RTDs, and Quantum Dots
27 Jan 2010   Contributor(s):: Gerhard Klimeck
Exercises:Barrier StructuresUses: PieceWise Constant Potential Barrier ToolResonant Tunneling DiodesUses: Resonant Tunneling Diode Simulation with NEGF • Hartree calculation • Thomas Fermi potentialQuantum DotsUses: Quantum Dot Lab • pyramidal dot

Nanoelectronic Modeling Lecture 14: Open 1D Systems  Formation of Bandstructure
27 Jan 2010   Contributor(s):: Gerhard Klimeck, Dragica Vasileska
The infinite periodic structure Kroenig Penney model is often used to introduce students to the concept of bandstructure formation. It is analytically solvable for linear potentials and shows critical elements of bandstructure formation such as core bands and different effective masses in...

Nanoelectronic Modeling Lecture 12: Open 1D Systems  Transmission through Double Barrier Structures  Resonant Tunneling
27 Jan 2010   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.

Nanoelectronic Modeling Lecture 08: Introduction to Bandstructure Engineering II
25 Jan 2010   Contributor(s):: Gerhard Klimeck
This presentation provides a brief overview of the concepts of bandstructure engineering and its potential applications to light detectors, light emitters, and electron transport devices. Critical questions of the origin of bandstructure and its dependence on local atom arrangements are raised...

Nanoelectronic Modeling Lecture 07: Introduction to Bandstructure Engineering I
25 Jan 2010   Contributor(s):: Gerhard Klimeck
This presentation serves as a reminder about basic quantum mechanical principles without any real math. The presentation reviews critical properties of classical systems that can be described as particles, propagating waves, standing waves, and chromatography.

Metal Oxide Nanowires as Gas Sensing Elements: from Basic Research to Real World Applications
21 Sep 2009   Contributor(s):: andrei kolmakov
Quasi 1D metal oxide single crystal chemiresistors are close to occupy their specific niche in the real world of solid state sensorics. Potentially, the major advantage of this kind of sensors with respect to available granular thin film sensors will be their size and stable, reproducible and...

Lecture 3: Low Bias Transport in Graphene: An Introduction
18 Sep 2009   Contributor(s):: Mark Lundstrom
Outline:Introduction and ObjectivesTheoryExperimental approachResultsDiscussionSummaryLecture notes are available for this lecture.

ECE 656 Lecture 4: Density of States  Density of Modes
14 Sep 2009   Contributor(s):: Mark Lundstrom
Outline:Density of states Example: graphene Density of modes Example: graphene Summary

ME 597 Lecture 1: Introduction to Basic Quantum Mechanics
01 Sep 2009   Contributor(s):: Ron Reifenberger
Note: This lecture has been revised since its original presentation.Topics:Introduction to Basic Quantum MechanicsEnergy States in Periodic Crystals