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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 to...
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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.
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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...
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Nanoelectronic Modeling Lecture 25a: NEMO1D - Full Bandstructure Effects
07 Jul 2010 | | Contributor(s):: Gerhard Klimeck
(quantitative RTD modeling at room temperature)
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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 split-off hole bands. The bandstructure of holes and the...
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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 roughness...
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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 with...
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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,...
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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...
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Nanoelectronic Modeling Lecture 41: Full-Band 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 multi-scale simulation of advanced InAs-based high mobility transistors.Learning Objectives:Quantum Transport Simulator Full-Band and Atomistic III-V HEMTs Performance Analysis Good Agreement with Experiment Some Open Issues...
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Nanoelectronic Modeling: Exercises 1-3 - Barrier Structures, RTDs, and Quantum Dots
27 Jan 2010 | | Contributor(s):: Gerhard Klimeck
Exercises:Barrier StructuresUses: Piece-Wise Constant Potential Barrier ToolResonant Tunneling DiodesUses: Resonant Tunneling Diode Simulation with NEGF • Hartree calculation • Thomas Fermi potentialQuantum DotsUses: Quantum Dot Lab • pyramidal dot
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Nanoelectronics/Mechanics With Carbon Nanotubes
26 Feb 2004 | | Contributor(s):: Ji-Yong Park
In this talk, I will present efforts to understand electrical/mechanical properties of carbon nanotubes (CNTs) by combining electric transport measurements and the scanning probe microscopy.
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Dec 01 2021
nanoHUB Online Recitation Series for Semiconductor Education: ABACUS Overview and Crystal Structures
Series Information: Recent economic needs have re-kindled national and global interest in semiconductor devices and created an urgent need for more semiconductor device engineers and...
https://nanohub.org/events/details/2112
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Apr 27 2022
nanoHUB Recitation Series for Semiconductor Education and Workforce Development: Bandstructure Models
Abstract: In the third session, Dr. Gerhard Klimeck will give a brief overview of ABACUS and demonstrate several bandstructure tools. With these, students can explore the Standard Periodic...
https://nanohub.org/events/details/2172
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Dec 16 2021
nanoHUB Recitation Series for Semiconductor Education: Bandstructure Models
Series Information: Recent economic needs have re-kindled national and global interest in semiconductor devices and created an urgent need for more semiconductor device engineers and...
https://nanohub.org/events/details/2115
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nanoHUB-U: Primer on Semiconductor Fundamentals
Courses|'
28 Jan 2019
From smartphones to satellites, semiconductors are everywhere. Tying together physics, chemistry, and electrical engineering, this easy-to-follow introduction provides the background needed to...
https://nanohub.org/courses/PSF
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nanoMATERIALS SeqQuest DFT
04 Feb 2008 | | Contributor(s):: Ravi Pramod Kumar Vedula, Greg Bechtol, Benjamin P Haley, Alejandro Strachan
DFT calculations of materials
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Nanotechnology Animation Gallery
20 Apr 2010 | | 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. Additional animations are also...
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NEMO5 and 2D Materials: Tuning Bandstructures, Wave Functions and Electrostatic Screening
18 Oct 2016 | | Contributor(s):: Tillmann Christoph Kubis
In this talk, I will briefly discuss the MLWF approach and compare it to DFT and atomistic tight binding. Initial results using the MLWF approach for 2D material based devices will be discussed and compared to experiments. These results unveil systematic band structure changes as functions of the...
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NEMO5 Overview Presentation
17 Jul 2012 | | 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.