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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.
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.
Quantum Dot Lab Learning Module: An Introduction
5.0 out of 5 stars
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.
Quantum Dot Quantum Computation Simulator
0.0 out of 5 stars
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.
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...
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.
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.
4.5 out of 5 stars
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...
Quantum Transport: Atom to Transistor (Spring 2004)
23 May 2006 | Courses | Contributor(s): Supriyo Datta
A newer version of this course is now available
and we would greatly appreciate your feedback regarding the new format and contents.
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...
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,...
Quantum-dot Cellular Automata (QCA) - Memory Cells
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,...
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.
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.
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...
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...
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...
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...
Structure and Morphology of Silicon-Germanium Thin Films
07 Feb 2015 | Presentation Materials | Contributor(s): Brian Demczyk
This presentation describes the growth of (Si,Ge & SiGe) thin films on Si and Ge (001) and (111) substrates by ultrahigh vacuum chemical vapor deposition (UHVCVD). Thin films were...
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...
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...