
ABACUS Bandstructure Models
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 KronigPenney model as well as bandstructure formation by transmission through finite barriers. They can change...

Bandgap Manipulation of Armchair Graphene nanoribbon
01 Sep 2020   Contributor(s):: Lance Fernandes
Bandgap Manipulation is very important for various applications. Optical Devices need smaller Bandgap where as Diode's need larger Bandgap. Armchair graphene Nanoribbon (AGNR) has a special property where if the numbers of atoms are multiple of three or multiple of three plus one, they are...

ABACUS—Introduction to Semiconductor Devices
When we hear the term semiconductor device, we may think first of the transistors in PCs or video game consoles, but transistors are the basic component in all of the electronic devices we use in...
https://nanohub.org/wiki/EduSemiconductor2

Genetic Algorithm Based Tight Binding Parameterisation
08 Aug 2018   Contributor(s):: Samik Mukherjee
This paper is a short description on how to use MATLAB genetic algorithm toolbox for generating tight binding parameters. A Hamiltonian is constructed and interfaced with MATLAB genetic algorithm for generating parameters that have been put in NEMO5 quantum transport software.

Dibya Prakash Rai
https://nanohub.org/members/187116

Transferable Tight Binding Model for Strained Heterostructures
22 Oct 2016   Contributor(s):: Yaohua Tan, Michael Povolotskyi, Tillmann Christoph Kubis, Timothy Boykin, Gerhard Klimeck
IWCE 2015 presentation.

Bismide Semiconductors: Revolutionising Telecom Lasers
19 Oct 2015   Contributor(s):: Muhammad Usman, Christopher A Broderick, Eoin P O\'reilly
Today’s telecomm lasers are plagued with Augerrelated losses, which significantly reduce their efficiency and make device cooling essential. We are proposing a radical change in the laser technology by developing a new class of materials, bismide semiconductors. These novel nanomaterials...

Density Functional Tight Binding (DFTB) Modeling in the Context of UltraThin SilicononInsulator MOSFETs
10 Oct 2015   Contributor(s):: Stanislav Markov
IWCE 2015 presentation. We investigate the applicability of density functional tight binding (DFTB) theory [1][2], coupled to nonequilibrium Green functions (NEGF), for atomistic simulations of ultrascaled electron devices, using the DFTB+ code [3][4]. In the context of ultrathin...

Tight Binding Parameters by DFT mapping
12 Sep 2012   Contributor(s):: Yaohua Tan, Michael Povolotskyi, Tillmann Christoph Kubis, Yu He, Zhengping Jiang, Timothy Boykin, Gerhard Klimeck
The Empirical Tight Binding(ETB) method is widely used in atomistic device simulations. The reliability of such simulations depends very strongly on the choice of basis sets and the ETB parameters. The traditional way of obtaining the ETB parameters is by fitting to experiment data,or critical...

OMEN Nanowire: solve the challenge
05 Feb 2011   Contributor(s):: SungGeun Kim
This document includes a challenging problems for OMEN Nanowire users. It challenges users to establish a nanowire transistor structure such that it satisfy the ITRS 2010 requirements.

OMEN Nanowire Homework Problems
24 Jan 2011   Contributor(s):: SungGeun Kim
OMEN Nanowire homework problems: anyone who has gone through the firsttime user guide of OMEN Nanowire and done the examples in the guide should be able to run simulations in these homework problems and find the answers to them.

Thermoelectric effects in semiconductor nanostructures: Role of electron and lattice properties
06 Oct 2010   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...

Nanoelectronic Modeling Lecture 40: Performance Limitations of Graphene Nanoribbon Tunneling FETS due to Line Edge Roughness
05 Aug 2010   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 TightBinding Orbital Model 3D SchrödingerPoisson Solver Device Simulation Structure Optimization (Doping, Lg, VDD) LER => Localized Band Gap States LER =>...

Nanoelectronic Modeling Lecture 32: Strain Layer Design through Quantum Dot TCAD
04 Aug 2010   Contributor(s):: Gerhard Klimeck, Muhammad Usman
This presentation demonstrates the utilization of NEMO3D to understand complex experimental data of embedded InAs quantum dots that are selectively overgrown with a strain reducing InGaAs layer. Different alloy concentrations of the strain layer tune the optical emission and absorption wavelength...

Nanoelectronic Modeling Lecture 29: Introduction to the NEMO3D Tool
04 Aug 2010   Contributor(s):: Gerhard Klimeck
This presentation provides a very high level software overview of NEMO3D. The items discussed are:Modeling Agenda and MotivationTightBinding Motivation and basic formula expressionsTight binding representation of strainSoftware structureNEMO3D algorithm flow NEMO3D parallelization scheme –...

Nanoelectronic Modeling Lecture 28: Introduction to Quantum Dots and Modeling Needs/Requirements
20 Jul 2010   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...

ABACUS Exercise: Bandstructure – KronigPenney Model and TightBinding Exercise
20 Jul 2010   Contributor(s):: Dragica Vasileska, Gerhard Klimeck
The objective of this exercise is to start with the simple KronigPenney model and understand formations of bands and gaps in the dispersion relation that describes the motion of carriers in 1D periodic potentials. The second exercise examines the behavior of the bands at the Brillouin zone...

TightBinding Band Structure Calculation Method
08 Jun 2010   Contributor(s):: Dragica Vasileska, Gerhard Klimeck
This set of slides describes on simple example of a 1D lattice, the basic idea behind the TightBinding Method for band structure calculation.

Carbon nanotube bandstructure
22 Apr 2010   Contributor(s):: Saumitra Raj Mehrotra, Gerhard Klimeck
Carbon nanotubes are allotropes of carbon with a cylindrical nanostructure, and can be categorized into singlewalled nanotubes (SWNT) and multiwalled nanotubes (MWNT). These cylindrical carbon molecules have novel properties that make them potentially useful in many nanotechnology applications,...

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...