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Resources (61-80 of 151)

1. Nanoelectronic Modeling Lecture 35: Alloy Disorder in Nanowires

   Online Presentations | 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...

2. Nanoelectronic Modeling Lecture 34: Alloy Disorder in Quantum Dots

   Online Presentations | 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,...

3. Description of the K.P Method for Band Structure Calculation

   Teaching Materials | 05 Aug 2010 | Contributor(s):: Dragica Vasileska

   This set of slides describes the k.p mehod for band structure calculation.

4. Nanoelectronic Modeling Lecture 33: Alloy Disorder in Bulk

   Online Presentations | 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...

5. Thermoelectric Nanotechnology

   Online Presentations | 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...

6. ABACUS Exercise: Bandstructure – Kronig-Penney Model and Tight-Binding Exercise

   Teaching Materials | 20 Jul 2010 | Contributor(s):: Dragica Vasileska, Gerhard Klimeck

   The objective of this exercise is to start with the simple Kronig-Penney 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...

7. DFT calculations with Quantum ESPRESSO

   Tools | 07 Jul 2010 | Contributor(s):: Janam Jhaveri, Ravi Pramod Kumar Vedula, Alejandro Strachan, Benjamin P Haley

   DFT calculations of molecules and solids

8. Nanoelectronic Modeling Lecture 25a: NEMO1D - Full Bandstructure Effects

   Online Presentations | 02 Mar 2010 | Contributor(s):: Gerhard Klimeck

   (quantitative RTD modeling at room temperature)

9. Band Structure Lab Exercise

   Teaching Materials | 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, photo-detectors etc. There are several standard methods to compute the band...

10. Ripples and Warping of Graphene: A Theoretical Study

    Online Presentations | 19 May 2010 | Contributor(s):: Umesh V. Waghmare

    We use first-principles density functional theory based analysis to understand formation of ripples in graphene and related 2-D materials. For an infinite graphene, we show that ripples are linked with a low energy branch of phonons that exhibits quadratic dispersion at long wave-lengths. Many...

11. Tight-Binding Band Structure Calculation Method

    Teaching Materials | 02 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 Tight-Binding Method for band structure calculation.

12. InAs: Evolution of iso-energy surfaces for heavy, light, and split-off holes due to uniaxial strain.

    Animations | 21 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...

13. Band Structure Calculation: General Considerations

    Teaching Materials | 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...

14. Empirical Pseudopotential Method: Theory and Implementation

    Teaching Materials | 16 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

15. ninithi

    Downloads | 07 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 3-D visualization of Carbon nanotubes, Fullerenes, Graphene and Carbon nanoribbons and analyze the band structures of nanotubes and graphene.

16. Nanotechnology Animation Gallery

    Teaching Materials | 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...

17. Electronic band structure

    Animations | 09 Apr 2010 | Contributor(s):: Saumitra Raj Mehrotra, Gerhard Klimeck

    In solid-state 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...

18. Nanoelectronic Modeling Lecture 25b: NEMO1D - Hole Bandstructure in Quantum Wells and Hole Transport in RTDs

    Online Presentations | 02 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...

19. Nanoelectronic Modeling Lecture 26: NEMO1D -

    Online Presentations | 02 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...

20. Bulk Bandstructure in MATLAB: Pseudopotential Method

    Downloads | 08 Feb 2010 | Contributor(s):: Muhanad Zaki

    This code (MATLAB) readily calculates and plots the bandstructure of Silicon (bulk) using the empirical pseudopotential method.Detailed instructions are in the compressed archive.I hope it would be a useful/interesting educational toolNote: If you are running this code in a non-Windows OS (e.g....