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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 (1-20 of 87)

  1. Structure and Morphology of Silicon Germanium Thin Films

    30 Dec 2013 | Publications | 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

  2. Excited State Spectroscopy of a Quantum Dot Molecule

    11 Jan 2013 | Online Presentations | Contributor(s): Muhammad Usman

    Atomistic electronic structure calculations are performed to study the coherent inter-dot couplings of the electronic states in a single InGaAs quantum dot molecule. The experimentally observed...

    http://nanohub.org/resources/12686

  3. 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

  4. NEMO5 Tutorial 5A: Devi ce Simulation - Quantum Dots

    17 Jul 2012 | Online Presentations | Contributor(s): Jean Michel D Sellier

    This presentation introduces the capabilities of NEMO5 to simulate quantum dots.

    http://nanohub.org/resources/14705

  5. 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

  6. NEMO3D User Guide for Quantum Dot Simulations

    29 Nov 2011 | Publications | Contributor(s): M. Usman, Gerhard Klimeck

    NEMO 3D is a large and complex simulator; and understanding of its source code requires considerable knowledge of quantum mechanics, condensed matter theory, and parallel programming.

    http://nanohub.org/resources/12593

  7. Polarization Response of Multi-layer InAs Quantum Dot Stacks

    25 Oct 2011 | Online Presentations | Contributor(s): Muhammad Usman

    Recent experimental measurements, without any theoretical guidance, showed that isotropic polarization response can be achieved by increasing the number of QD layers in a QD stack. In this work,...

    http://nanohub.org/resources/12312

  8. BME 695L Lecture 5: Nanomaterials for Core Design

    03 Oct 2011 | Online Presentations | Contributor(s): James Leary

    See references below for related reading. 5.1      Introduction 5.1.1    core building blocks 5.1.2    functional...

    http://nanohub.org/resources/12057

  9. The History of Semiconductor Heterostructures Research: From Early Double Heterostructure Concept to Modern Quantum Dot Structures

    11 Jul 2011 | Online Presentations | Contributor(s): Zhores I. Alferov

    It would be very difficult today to imagine solid-state physics without semiconductor heterostructures. Semiconductor heterostructures and especially double heterostructures, including quantum...

    http://nanohub.org/resources/11436

  10. Illinois ECE598XL Semiconductor Nanotechnology - 3 - Quantum Dots: Formation

    27 Jun 2011 | Online Presentations | Contributor(s): Xiuling Li

    http://nanohub.org/resources/11404

  11. Quantitative Modeling and Simulation of Quantum Dots

    18 Apr 2011 | Presentation Materials | Contributor(s): Muhammad Usman

    Quantum dots grown by self-assembly process are typically constructed by 50,000 to 5,000,000 structural atoms which confine a small, countable number of extra electrons or holes in a space that is...

    http://nanohub.org/resources/9332

  12. Tutorial 4b: Introduction to the NEMO3D Tool - Electronic Structure and Transport in 3D

    29 Mar 2011 | Online Presentations | Contributor(s): Gerhard Klimeck

    Electronic Structure and Transport in 3D - Quantum Dots, Nanowires and Ultra-Thin Body Transistors

    http://nanohub.org/resources/11049

  13. 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

  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. 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

  16. 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

  17. Modeling the quantum dot growth in the continuum approximation

    12 Jan 2011 | Publications | Contributor(s): Peter Cendula

    Quantum dots can grow spontaneously during molecular beam epitaxy of two materials with different lattice parameters, Stranski-Krastanow growth mode. We study a mathematical model based on the...

    http://nanohub.org/resources/10365

  18. Atomistic Modeling and Simulation Tools for Nanoelectronics and their Deployment on nanoHUB.org

    16 Dec 2010 | Online Presentations | Contributor(s): Gerhard Klimeck

    At the nanometer scale the concepts of device and material meet and a new device is a new material and vice versa. While atomistic device representations are novel to device physicists, the...

    http://nanohub.org/resources/10199

  19. Test for Quantum Dot Lab tool

    09 Nov 2010 | Teaching Materials | Contributor(s): SungGeun Kim, Saumitra Raj Mehrotra

    This test is aimed at self-learning students or instructors who may be engaged in teaching classes related to the quantum dot lab tool. The level of this test should not be difficult for a...

    http://nanohub.org/resources/9968

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

    05 Aug 2010 | Online Presentations | 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 engineering What happens when...

    http://nanohub.org/resources/9279

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.