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Tags: quantum dots

Description

Quantum dots have a small, countable number of electrons confined in a small space. Their electrons are confined by having a tiny bit of conducting material surrounded on all sides by an insulating material. If the insulator is strong enough, and the conducting volume is small enough, then the confinement will force the electrons to have discrete (quantized) energy levels. These energy levels can influence the device behavior at a macroscopic scale, showing up, for example, as peaks in the conductance. Because of the quantized energy levels, quantum dots have been called "artificial atoms." Neighboring, weakly-coupled quantum dots have been called "artificial molecules."

Learn more about quantum dots from the many resources on this site, listed below. More information on Quantum dots can be found here.

Resources (61-80 of 87)

  1. Quantum Dot based Photonic Devices

    01 Apr 2012 | Online Presentations | Contributor(s): Muhammad Usman

    Deployment of nanometer-sized semiconductor quantum dots (QDs) in the active region of photonic devices such as lasers, semiconductor optical amplifiers (SOA's), photo-detectors etc. for the...

    http://nanohub.org/resources/13532

  2. Quantum Dot Lab

    12 Nov 2005 | Tools | Contributor(s): Gerhard Klimeck, Lars Bjaalie, Sebastian Steiger, David Ebert, Tillmann Christoph Kubis, Matteo Mannino, Michael McLennan, Hong-Hyun Park, Michael Povolotskyi

    Compute the eigenstates of a particle in a box of various shapes including domes and pyramids.

    http://nanohub.org/resources/qdot

  3. Quantum Dot Lab Demonstration: Pyramidal Qdots

    11 Jun 2009 | Animations | Contributor(s): Gerhard Klimeck, Benjamin P Haley

    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.

    http://nanohub.org/resources/6845

  4. Quantum Dot Lab Learning Module: An Introduction

    02 Jul 2007 | Learning Modules | Contributor(s): James K Fodor, Jing Guo

    THIS MATERIAL CORRESPONDS TO AN OLDER VERSION OF QUANTUM DOT LAB THAN CURRENTLY AVAILABLE ON nanoHUB.org.

    http://nanohub.org/resources/2846

  5. Quantum Dot Quantum Computation Simulator

    04 Aug 2012 | Tools | Contributor(s): Brian Sutton

    Performs simulations of quantum dot quantum computation using a model Hamiltonian with an on-site magnetic field and modulated inter-dot exchange interaction.

    http://nanohub.org/resources/qudosim

  6. Quantum Dot Spectra, Absorption, and State Symmetry: an Exercise

    30 Mar 2008 | Teaching Materials | Contributor(s): Gerhard Klimeck

    The tutorial questions based on the Quantum Dot Lab v1.0 available online at Quantum Dot Lab. Students are asked to explore the various different quantum dot shapes, optimize the intra-band...

    http://nanohub.org/resources/4203

  7. Quantum Dot Wave Function (Quantum Dot Lab)

    02 Feb 2011 | Animations | Contributor(s): Gerhard Klimeck, David S. Ebert, Wei Qiao

    Electron density of an artificial atom. The animation sequence shows various electronic states in an Indium Arsenide (InAs)/Gallium Arsenide (GaAs) self-assembled quantum dot.

    http://nanohub.org/resources/10751

  8. Quantum Dot Wave Function (still image)

    31 Jan 2011 | Animations | Contributor(s): Gerhard Klimeck, David S. Ebert, Wei Qiao

    Electron density of an artificial atom. The image shown displays the excited electron state in an Indium Arsenide (InAs) / Gallium Arsenide (GaAs) self-assembled quantum dot.

    http://nanohub.org/resources/10692

  9. Quantum Dots

    21 Jul 2005 | Online Presentations | Contributor(s): Gerhard Klimeck

    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...

    http://nanohub.org/resources/189

  10. Quantum Transport: Atom to Transistor (Spring 2004)

    23 May 2006 | Courses | Contributor(s): Supriyo Datta

    Spring 2004 Please Note: A newer version of this course is now available and we would greatly appreciate your feedback regarding the new format and contents. Course Information...

    http://nanohub.org/resources/1490

  11. Quantum-dot Cellular Automata

    24 Nov 2003 | Online Presentations | Contributor(s): Craig S. Lent

    The multiple challenges presented by the problem of scaling transistor sizes are all related to the fact that transistors encode binary information by the state of a current switch. What is...

    http://nanohub.org/resources/148

  12. Quantum-dot Cellular Automata (QCA) - Logic Gates

    03 Feb 2006 | Animations | Contributor(s): John C. Bean

    An earlier animation described how "Quantum-dot Cellular Automata" (QCAs) could serve as memory cells and wires. This animation contnues the story by describing how QCAs can be made into MAJORITY,...

    http://nanohub.org/resources/1005

  13. Quantum-dot Cellular Automata (QCA) - Memory Cells

    03 Feb 2006 | Animations | Contributor(s): John C. Bean

    Scientists and engineers are looking for completely different ways of storing and analyzing information. Quantum-dot Cellular Automata are one possible solution. In computers of the future,...

    http://nanohub.org/resources/1006

  14. Self-Assembled Quantum Dot Structure (pyramid)

    02 Feb 2011 | Animations | Contributor(s): Gerhard Klimeck, Insoo Woo, Muhammad Usman, David S. Ebert

    Pyramidal InAs Quantum dot. The quantum dot is 27 atomic monolayers wide at the base and 15 atomic monolayers tall.

    http://nanohub.org/resources/10730

  15. Self-Assembled Quantum Dot Wave Structure

    31 Jan 2011 | Animations | Contributor(s): Gerhard Klimeck, Insoo Woo, Muhammad Usman, David S. Ebert

    A 20nm wide and 5nm high dome shaped InAs quantum dot grown on GaAs and embedded in InAlAs is visualized.

    http://nanohub.org/resources/10689

  16. Semiconductor Interfaces at the Nanoscale

    17 Oct 2005 | Online Presentations | Contributor(s): David Janes

    The trend in downscaling of electronic devices and the need to add functionalities such as sensing and nonvolatile memory to existing circuitry dictate that new approaches be developed for device...

    http://nanohub.org/resources/196

  17. SEQUAL 2.1 Source Code Download

    09 Mar 2005 | Downloads | Contributor(s): Michael McLennan

    SEQUAL 2.1 is a device simulation program that computes Semiconductor Electrostatics by Quantum Analysis. Given a device, SEQUAL will compute the electron density and the current density using a...

    http://nanohub.org/resources/104

  18. Single Electron Switching with Nano-Electromechanical Systems and Applications in Ion Channel Transport

    01 Nov 2004 | Online Presentations | Contributor(s): Robert Blick

    Taking classes in physics always starts with Newtonian mechanics. In reducing the size of the objects considered however the transition into the quantum mechanical regime has to occur. The...

    http://nanohub.org/resources/173

  19. Structure and Morphology of Silicon Germanium Thin Films

    30 Dec 2013 | Papers | Contributor(s): Brian Demczyk

    Single layer silicon and germanium films as well as nominally 50-50 silicon-germanium alloys were deposited on single crystal silicon and germanium (001) and (111) substrates by ultrahigh vacuum...

    http://nanohub.org/resources/20123

  20. Surprises on the nanoscale: Plasmonic waves that travel backward and spin birefringence without magnetic fields

    08 Jan 2007 | Online Presentations | Contributor(s): Daniel Neuhauser

    As nanonphotonics and nanoelectronics are pushed down towards the molecular scale, interesting effects emerge. We discuss how birefringence (different propagation of two polarizations) is...

    http://nanohub.org/resources/2256

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.