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ABACUS Tool Suite and Bandstructure and Band Models (Fall 2023)
Online Presentations | 22 Aug 2023 | Contributor(s):: Gerhard Klimeck
In the third session, Dr. Klimeck will give a brief overview of ABACUS and demonstrate several bandstructure tools. With these, students can explore the Standard Periodic Potential aka Kronig-Penney model as well as bandstructure formation by transmission through finite barriers....
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ABACUS Bandstructure Models (Spring 2022)
Online Presentations | 05 May 2022 | Contributor(s):: Gerhard Klimeck
In the third session, Dr. Klimeck will give a brief overview of ABACUS and demonstrate several bandstructure tools. With these, students can explore the Standard Periodic Potential aka Kronig-Penney model as well as bandstructure formation by transmission through finite barriers....
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ABACUS Bandstructure Models (Winter 2021)
Online Presentations | 21 Dec 2021 | Contributor(s):: Gerhard Klimeck
In the third session, Dr. Klimeck will give a brief overview of ABACUS and demonstrate several bandstructure tools. With these, students can explore the Standard Periodic Potential aka Kronig-Penney model as well as bandstructure formation by transmission through finite barriers...
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Tutorial 4a: High Bias Quantum Transport in Resonant Tunneling Diodes
Online Presentations | 29 Mar 2011 | Contributor(s):: Gerhard Klimeck
Outline:Resonant Tunneling Diodes - NEMO1D: Motivation / History / Key InsightsOpen 1D Systems: Transmission through Double Barrier Structures - Resonant TunnelingIntroduction to RTDs: Linear Potential DropIntroduction to RTDs: Realistic Doping ProfilesIntroduction to RTDs: Relaxation Scattering...
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Tutorial 4c: Formation of Bandstructure in Finite Superlattices (Exercise Session)
Online Presentations | 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?
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Tutorial 4d: Formation of Bandstructure in Finite Superlattices (Exercise Demo)
Online Presentations | 29 Mar 2011 | Contributor(s):: Gerhard Klimeck
Demonstration of thePiece-Wise Constant Potential Barriers Tool.
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Nanoelectronic Modeling nanoHUB Demo 2: RTD simulation with NEGF
Online Presentations | 09 Mar 2010 | 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 characteristics, and resonance energies. Also demonstrated is a RTD simulation using a Thomas-Fermi...
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Nanoelectronic Modeling nanoHUB Demo 1: nanoHUB Tool Usage with RTD Simulation with NEGF
Online Presentations | 09 Mar 2010 | 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 model.
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Nanoelectronic Modeling: Exercises 1-3 - Barrier Structures, RTDs, and Quantum Dots
Online Presentations | 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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Nanoelectronic Modeling Lecture 19: Introduction to RTDs - Asymmetric Structures
Online Presentations | 27 Jan 2010 | 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 we expect that the tunneling rate into the RTD from the emitter is faster than the tunneling rate...
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Nanoelectronic Modeling Lecture 18: Introduction to RTDs - Quantum Charge Self-Consistency (Hartree)
Online Presentations | 27 Jan 2010 | 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.
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Nanoelectronic Modeling Lecture 17: Introduction to RTDs - Relaxation Scattering in the Emitter
Online Presentations | 27 Jan 2010 | 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 bound states.
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Nanoelectronic Modeling Lecture 16: Introduction to RTDs - Realistic Doping Profiles
Online Presentations | 27 Jan 2010 | 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 spaced 20-100nm away from the central double barrier structure.
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Nanoelectronic Modeling Lecture 12: Open 1D Systems - Transmission through Double Barrier Structures - Resonant Tunneling
Online Presentations | 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: Multimillion Atom Simulations, Transport, and HPC Scaling to 23,000 Processors
Online Presentations | 07 Mar 2008 | 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 structures the behavior of carriers and their interaction with their environment need to be fundamentally...