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Quantum Dots
07 May 2015 | | Contributor(s):: Sebastien Maeder, NACK Network
OutlineIntroductionQuantum ConfinementQD SynthesisColloidal MethodsEpitaxial GrowthApplicationsBiologicalLight EmittersAdditionalApplications
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Structure and Morphology of Silicon-Germanium Thin Films
07 Feb 2015 | | 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 characterized structurally by conventional and high-resolution transmission electron microscopy (TEM) and...
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Structure and Morphology of Silicon Germanium Thin Films
30 Dec 2013 | | 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 chemical vapor deposition. These films spanned the range of + 4 % film-substrate lattice mismatch. A...
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Why quantum dot simulation domain must contain multi-million atoms?
11 Jan 2013 | | Contributor(s):: Muhammad Usman
The InGaAs quantum dots obtained from the self-assembly growth process are heavily strained. The long-range strain and piezoelectric fields significantly modifies the electronic structure of the quantum dots. This imposes a critical constraint on the minimum size of the simulation domain to study...
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Excited State Spectroscopy of a Quantum Dot Molecule
11 Jan 2013 | | 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 excitonic spectrum by Krenner et al (Phys. Rev. Lett. 94 057402, 2005) is quantitatively reproduced,...
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Quantum Dot Quantum Computation Simulator
04 Aug 2012 | | 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.
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NEMO5 Tutorial 5C: Quantum Dots with Strain and Electronic Wave Functions
18 Jul 2012 | | Contributor(s):: Yuling Hsueh
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NEMO5 Tutorial 5A: Devi ce Simulation - Quantum Dots
17 Jul 2012 | | Contributor(s):: Jean Michel D Sellier
This presentation introduces the capabilities of NEMO5 to simulate quantum dots.
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NEMO5 Overview Presentation
17 Jul 2012 | | Contributor(s):: Tillmann Christoph Kubis, Michael Povolotskyi, Jean Michel D Sellier, James Fonseca, Gerhard Klimeck
This presentation gives an overview of the current functionality of NEMO5.
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Quantum Dot based Photonic Devices
19 Mar 2012 | | Contributor(s):: Muhammad Usman
Deployment of nanometer-sized semiconductor quantum dots (QDs) in the active region ofphotonic devices such as lasers, semiconductor optical amplifiers (SOA's), photo-detectors etc.for the next generation communication systems offers unique characteristics such astemperature-insensitivity, high...
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On the Two to Three Dimensional Growth Transition in Strained Silicon Germanium Thin Films
31 Jan 2012 | | Contributor(s):: Brian Demczyk
Utilizing a model adapted from classical nucleation theory [8], we calculate a "critical thickness" for island formation, taking into account the surfaceenergies of the deposit and the substrate and the elastic modulus of the deposit, to which experimental results for CVD grown silicon germanium...
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NEMO3D User Guide for Quantum Dot Simulations
29 Nov 2011 | | 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.
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Polarization Response of Multi-layer InAs Quantum Dot Stacks
20 Oct 2011 | | 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, we analyse the polarization response of multi-layer quantum dot stacks containing up to nine quantum...
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BME 695L Lecture 5: Nanomaterials for Core Design
14 Sep 2011 | | Contributor(s):: James Leary
See references below for related reading.5.1 Introduction5.1.1 core building blocks5.1.2 functional cores5.1.3 functionalizing the core surface5.2 Ferric...
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The History of Semiconductor Heterostructures Research: From Early Double Heterostructure Concept to Modern Quantum Dot Structures
21 Jun 2011 | | 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 wells, quantum wires and quantum dots, currently comprise the object of investigation of two thirds of...
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Illinois ECE598XL Semiconductor Nanotechnology - 3 - Quantum Dots: Formation
15 Jun 2011 | | Contributor(s):: Xiuling Li
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Quantitative Modeling and Simulation of Quantum Dots
16 Jul 2010 | | 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 comparable in size to the electron wavelength. Under such conditions quantum dots can be interpreted...
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Illinois Nano EP Seminar Series Spring 2010 - Lecture 8: Quantum Dot and Nanopore Lasers
29 Jan 2011 | | Contributor(s):: James J. Coleman
We describe the growth, processing, and characteristics of self‐assembled and patterned quantum dot and nanopore lasers that exhibit interesting effects arising from reduction of the active medium to the quantum regime (
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Tutorial 4b: Introduction to the NEMO3D Tool - Electronic Structure and Transport in 3D
23 Mar 2011 | | Contributor(s):: Gerhard Klimeck
Electronic Structure and Transport in 3D - Quantum Dots, Nanowires and Ultra-Thin Body Transistors
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Quantum Dot Lab: First-Time User Guide
08 Feb 2011 | | Contributor(s):: SungGeun Kim, Lynn Zentner
This first-time user guide introduces the quantum dot lab tool. It includes an explanation of the input/output interface and the relationship between inputs and outputs of the quantum dot lab.NCN@Purdue[1] Gerhard Klimeck, Introduction to Quantum Dot Lab: https://www.nanohub.org/resources/4194[2]...