PCPBT Manual
08 Jun 2010 | Contributor(s): Dragica Vasileska, Gerhard Klimeck
This is a manual for the Piece-Wise Constant Potential Barrier Tool.
Bulk Monte Carlo: Implementation Details and Source Codes Download
01 Jun 2010 | Contributor(s): Dragica Vasileska, Stephen M. Goodnick
The Ensemble Monte Carlo technique has been used now for over 30 years as a numerical method to simulate nonequilibrium transport in semiconductor materials and devices, and has been the subject of numerous books and reviews. In application to transport problems, a random walk is generated to...
Bound States and Open Systems
01 Jun 2010 | Contributor(s): Dragica Vasileska
bound states, open systems, transfer matrix approach, gate leakage calculation in Schottky gates
Basics of Quantum Mechanics
Classical vs. Quantum physics, particle-wave duality, postulates of quantum mechanics
Numerical solution of the Drift-Diffusion Equations for a diode
This material describes the implementation and also gives the source code for the numerical solution of the Drift-Diffusion equations for a PN Diode. The code can be easily generalized for any 2D or 3D device.
Worked Examples for a PN Diode
01 Jun 2010 | Contributor(s): Dragica Vasileska, Gerhard Klimeck
several worked examples are presented that illustrate the operation of a PN diode.
Physical and Analytical Description of the Operation of a PN Diode
A detailed physical and analytical description of the operation of PN diodes is given.vasileska.faculty.asu.eduNSF
Drift-Diffusion Modeling and Numerical Implementation Details
This tutorial describes the constitutive equations for the drift-diffusion model and implementation details such as discretization and numerical solution of the algebraic equations that result from the finite difference discretization of the Poisson and the continuity...
Band Structure Calculation: General Considerations
17 May 2010 | Contributor(s): Dragica Vasileska
This set of slides explains to the users the concept of valence vs. core electrons, the implications of the adiabatic approximation on the separation of the total Hamiltonian of the system and the mean-field approximation used in ab initio bandstructure approaches. It then gives systematic...
Renewable Energy Sources
This presentation in pictures describes possibilities and utilization of alternative (green) sources of energy. Many sources contributed in the creation of this presentation.vasileska.faculty.asu.eduNSF
Empirical Pseudopotential Method: Theory and Implementation
This tutorial first teaches the users the basic theory behind the Empirical Pseudopotential (EPM)Bandstructure Calculation method. Next, the implementation details of the method are described and finally a MATLAB implementation of the EPM is provided.vasileska.faculty.asu.eduNSF
Nanoelectronic Modeling Lecture 14: Open 1D Systems - Formation of Bandstructure
27 Jan 2010 | Online Presentations | 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
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 11: Open 1D Systems - The Transfer Matrix Method
31 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 10: Open 1D Systems - Transmission through & over 1 Barrier
31 Dec 2009 | Online Presentations | Contributor(s): Gerhard Klimeck, Dragica Vasileska, Samarth Agarwal
Tunneling and interference are critical in the understanding of quantum mechanical systems. The 1D time independent Schrödinger equation can be easily solved analytically in a scattering matrix approach for a system of a single potential barrier. The solution is obtained by matching wavefunction...
Nanoelectronic Modeling Lecture 09: Open 1D Systems - Reflection at and Transmission over 1 Step
25 Jan 2010 | 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
25 Jan 2010 | 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...
Tutorial for PADRE Based Simulation Tools
10 Aug 2009 | Teaching Materials | Contributor(s): Dragica Vasileska, Gerhard Klimeck
This tutorial is intended for first time and medium level users of PADRE-based simulation modules installed on the nanohub. It gives clear overview on the capabilities of each tool with emphasis to most important effects occuring in nano-scale devices.
From Semi-Classical to Quantum Transport Modeling
10 Aug 2009 | Series | Contributor(s): Dragica Vasileska
This set of powerpoint slides series provides insight on what are the tools available for modeling devices that behave either classically or quantum-mechanically. An in-depth description is provided to the approaches with emphasis on the advantages and disadvantages of each approach. Conclusions...
From Semi-Classical to Quantum Transport Modeling: Quantum Transport - Recursive Green's function method, CBR approach and Atomistic
10 Aug 2009 | Teaching Materials | Contributor(s): Dragica Vasileska
From Semi-Classical to Quantum Transport Modeling: Quantum Transport - Usuki Method and Theoretical Description of Green's Functions
From Semi-Classical to Quantum Transport Modeling: Quantum Corrections to Semiclassical Approaches
From Semi-Classical to Quantum Transport Modeling: Particle-Based Device Simulations
From Semi-Classical to Quantum Transport Modeling: Drift-Diffusion and Hydrodynamic Modeling
From Semi-Classical to Quantum Transport Modeling: What is Computational Electronics?