
ABACUS: Test for Bandstructure Lab
10 Aug 2010  Contributor(s):: Dragica Vasileska, Gerhard Klimeck
This is a test that examines ones understanding of electronic structure once he/she has gone through the materials and exercises provided on the nanoHUB as part of the ABACUS Bandstructure topic page and running the Bandstructure Lab.

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,...

Description of the K.P Method for Band Structure Calculation
05 Aug 2010   Contributor(s):: Dragica Vasileska
This set of slides describes the k.p mehod for band structure calculation.

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...

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...

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...

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

Band Structure Lab Exercise
28 Jun 2010   Contributor(s):: Gerhard Klimeck, Parijat Sengupta, Dragica Vasileska
Investigations of the electron energy spectra of solids form one of the most active fields of research. Knowledge of band theory is essential for application to specific problems such as Gunn diodes, tunnel diodes, photodetectors etc. There are several standard methods to compute the band...

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...

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.

InAs: Evolution of isoenergy surfaces for heavy, light, and splitoff holes due to uniaxial strain.
25 May 2010   Contributor(s):: Abhijeet Paul, Denis Areshkin, Gerhard Klimeck
Movie was generated using Band Structure Lab tool at nanoHUB and allows to scan over four parameters:Hole energy measured from the top of the corresponding band (i.e. the origin of energy scales for LH and SOH is different)Strain direction: [001], [110], [111]Carrier type: LH, HH, SOHStrain...

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 meanfield approximation used in ab initio bandstructure approaches. It then gives systematic...

Empirical Pseudopotential Method: Theory and Implementation
17 May 2010   Contributor(s):: Dragica Vasileska
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

ninithi
13 May 2010   Contributor(s):: Chanaka Suranjith Rupasinghe, Mufthas Rasikim
ninithi which is a free and opensource modelling software, can be used to visualize and analyze carbon allotropes used in nanotechnology. You can generate 3D visualization of Carbon nanotubes, Fullerenes, Graphene and Carbon nanoribbons and analyze the band structures of nanotubes and graphene.

Nanotechnology Animation Gallery
22 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 available Featured nanoHUB tools: Band Structure Lab. Carrier...

Electronic band structure
12 Apr 2010   Contributor(s):: Saumitra Raj Mehrotra, Gerhard Klimeck
In solidstate physics, the electronic band structure (or simply band structure) of a solid describes ranges of energy in which an electron is "forbidden" or "allowed". The band structure is also often called the dispersion or the E(k) relationship. It is a mathematical relationship between the...

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 roughness...