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Extinction, Scattering and Absorption efficiencies of single and multilayer nanoparticles

This tool calculates the extinction, scattering, and absorption efficiencies of single nanoparticle (1 layer),core-shell nanoparticle (2 layer) and nanomatryushka nanoparticle (3 layer) using MIE formulation.

Here is a demo video on YouTube.

 

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Introduction to Quantum Dots and Modeling Needs/ Requirements

This lecture provides a very high level overview of quantum dots. The main issues and questions that are addressed are:

  1. Length scale of quantum dots
  2. Definition of a quantum dot
  3. Quantum dot examples and Applications
  4. Single electronics
  5. Need for quantum dot modeling
  6. Model requirements – what are the physical effects that need to be included?
  7. Overview of some of the existing theories and models
  8. Tight binding approach

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Engineering at the nanometer scale: is it a new material or a new device?

At the nanometer scale the concepts of device and material meet and a new device is really a new material and vice versa. While atomistic device representation is novel to device physicists who typically deal in effective mass models, the concept of finite devices that are not infinitely periodic is novel in the semiconductor materials modeling community. NEMO 3-D bridges the gap and enables electronic structure simulations of quantum dots, quantum wells, nanowires, and impurities. Electronic structure simulations of systems 52 million atoms have been demonstrated.
 

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Quantum Dot Lab Demonstration: Pyramidal Qdots

This video shows the simulation and analysis of a pyramid-shaped quantum dot using Quantum Dot Lab. Several powerful analytic features of this tool are demonstrated, including the following:

  • visualization of specific 3D wavefunctions corresponding to discrete energy levels within the quantum dot
  • rotating the 3D volume of the quantum dot with wavefunction
  • applying cut planes along the x and y axes and moving the cut planes along those axes.
  • customizing the color scale used in volume rendering
  • scanning through the energy levels of the states inside the dot
  • viewing the transition and absorption curves
  • returning to the input section to change the size of the quantum dot and running a new simulation
  • comparing the absorption curves for different dot sizes
  • interactively zooming in on regions of the absorption plots

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Nano 101 Quantum Dots

Quantum Dots are man-made artificial atoms that confine electrons to a small space. As such they have atomic-like behavior and enable the study of quantum mechanical effects on a length scale that is around 100 times larger than the pure atomic scale. Quantum dots offer application opportunities in optical sensors, lasers, and advanced electronic devices for memory and logic.

This seminar starts with an overview of wavelike and particle like properties and motivates the existence of quantum mechanics. It closes the quantum mechanics point of view with these new fascinating artificial atoms.

 

 

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QDot Learning Materials

By completing the Quantum Dot Lab, users will be able to:

- Understand the concept of 3D confinement of charge carriers in a Q Dot.

- Understand the concept of light absorption in a Q Dot.

- Apply numerical techniques to calculate:

  1. The 3D wave function in a Q Dot
  2. The energy states in a Q Dot
  3. The optical absorption strength in a Q Dot.

- Design and simulate their own Q Dot structures.
 

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Photovoltaic Education Network

A collection of resources for the photovoltaic educator.

As solar cell manufacturing continues to grow at a record-setting pace, increasing demands are placed on universities to educate students on both the practical and theoretical aspects of photovoltaics. As a truly interdisciplinary field, young professionals must be fluent with the science, engineering, policy, and market dimensions of this technology, in the context of a growing renewable energy economy.

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DFT on Wikipedia

This is a link to Wikipedia's page on Density Functional Theory.

  1. DFT

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Life Beyond DFT

Computational Nanoscience, Lecture 26: Life Beyond DFT -- Computational Methods for Electron Correlations, Excitations, and Tunneling Transport

By Jeffrey B. Neaton

Lawrence Berkeley National Laboratory

This lecture provides a brief introduction to "beyond DFT" methods for studying excited state properties, optical properties, and transport properties, how the GW approximation to the self-energy corrects the quasiparticle excitations energies predicted by Kohn-Sham DFT;  the Bethe-Salpeter Equation for optical properties; and an example demonstrating the use of the Landauer formalism for exploring transport properties.

  1. DFT

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Ale Strachan EAFIT presentation

Published on Apr 4, 2014

En una colaboración entre la Escuela de Ingeniería de EAFIT, el Centro de Computación Científica Apolo y Proyecto 50, recibimos a Alejandro Strachan, profesor asociado de la Universidad de Purdue, quien explicó la utilidad de las simulaciones en procesos de enseñanza y aprendizaje, así como su impacto en la ingeniería.

Esta metodología explora los múltiples recursos que brinda "nanoHUB", una página web orientada a la creación de simulaciones para la investigación.

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Tanya Faltens onto Materials in Spanish

Data Wanted

Does anyone have some data showing absorption of glass as a function of wavelength in the UV-Vis range?

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Nanoparticles cause cancer cells to self-destruct

The researchers have used nanoparticles of iron oxide that have been treated with a special form of magnetism. Once the particles are inside the cancer cells, the cells are exposed to a magnetic field, and the nanoparticles begin to rotate in a way that causes the lysosomes to start destroying the cells.

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Researchers change coercivity of material by patterning surface

Researchers from North Carolina State University have found a way to reduce the coercivity of nickel ferrite (NFO) thin films by as much as 80 percent by patterning the surface of the material. For devices that rely on switching current back and forth repeatedly – such as most consumer electronics – you want materials that have low coercivity, which improve device performance and use less energy.

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Antimony nanocrystals for batteries

Researchers from ETH Zurich and Empa have succeeded for the first time to produce uniform antimony nanocrystals. These nanomaterials operate with high rate and may eventually be used as alternative anode materials in future high-energy-density batteries.

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Nanostructured capsules could bring about paints and electronic displays that never fade

Manoharan’s lab has devised a system where microcapsules are filled with a disordered solution of even smaller particles suspended in water. When the microcapsule is partly dried out, it shrinks, bringing the particles closer and closer together. Eventually the average distance between all the particles will give rise to a specific reflected color from the capsule. Shrink the capsule a bit more, and they become another color, and then another.

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'Iron Man' plants are supercharged by nanotech power

A team of biologists and engineers has made bionic plants that have been upgraded with an injection of nanotechnology.

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Purdue makes “ultracold” molecules that look promising for quantum computing and simulation. Using lasers to cool atoms nearly to absolute zero and then gluing them together!

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Awesome article that features nanoHUB and the many things that it offers to the nano community and beyond, by International Science Grid This Week.

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Scientists build the thinnest possible LEDs (3 atoms thick, close to 10,000 times smaller than the thickness of human hair) to be stronger and more efficient.

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Colored diamonds are a superconductor's best friend

“These diamond sensors combine high sensitivity with the potential for high spatial resolution, and since they operate at higher temperatures than their competitors – superconducting quantum interference device, or SQUID, magnetometers – they turn out to be good for studying high temperature superconductors,”

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Pulling polymers with an AFM tip

Using the tip of the AFM, the researchers were able to pull single chains of molecules (polymers) off a gold surface. Remarkable behavior of nearly frictionless motion was predicted by a theoretical model and has now been verified for molecules on a gold surface.

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Optical nano-tweezers take over the control of nano-objects

Researchers at ICFO have implemented plasmonic nano-tweezers at the extremity of a mobile optical fiber, nano-engineered with a bowtie-like gold aperture. Note that nanoHUB has a simulator for nano-scale bowtie antennae. See second link.

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Biocompatible ternary nanoparticles for medical applications

Ternary nanoparticles (iron and silver core) can be used in different applications, such as a contrast agent in MRI, biomagnetic sensors, hyperthermia for cancer treatment and magnetically targeted delivery and transfection.

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Nanotechnology Helps 3-D TV Make a Comeback Without Glasses

Jayan Thomas, an assistant professor at UCF’s NanoScience Technology Center, has received a US $400 000 grant from the National Science Foundation to pursue the use of nanoprinting techniques for turning polymers into displays whose images appear in 3-D to the naked eye.

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nanoHUB.org, a resource for nanoscience and nanotechnology, is supported by the National Science Foundation and other funding agencies. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.