A5006707199- Scientific Computing and Data Management
- Quantum and electron transport phenomena
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- Distributed and Parallel Computing Systems
- Research Data Management Practices
- Molecular Junctions and Nanostructures
- Nanotechnology research and applications
- Advanced Data Storage Technologies
- Nanowire Synthesis and Applications
- Semiconductor Lasers and Optical Devices
- VLSI and FPGA Design Techniques
- Manufacturing Process and Optimization
- Advanced Thermodynamics and Statistical Mechanics
- Physics of Superconductivity and Magnetism
- Biomedical and Engineering Education
- Big Data and Business Intelligence
- Science, Research, and Medicine
- Surface and Thin Film Phenomena
- Advanced MEMS and NEMS Technologies
- E-Learning and Knowledge Management
- Cloud Computing and Remote Desktop Technologies
- Interdisciplinary Research and Collaboration
- Photonic and Optical Devices
Purdue University West Lafayette
2006-2015
Purdue University System
2015
The University of Queensland
1976-2012
Computing Center
2008
Yale University
2006
University of Southern California
2006
Sandia National Laboratories
2006
Illinois Institute of Technology
2006
University of Oxford
2006
Wabash College
2006
The HUBzero cyberinfrastructure lets scientific researchers work together online to develop simulation and modeling tools. Other can then access the resulting tools using an ordinary Web browser launch runs on national Grid infrastructure, without having download or compile any code.
In 2002, the National Science Foundation established Network for Computational Nanotechnology (NCN), a network of universities supporting Initiative by bringing computational tools online, making easy to use, and with educational materials. Along way, NCN created unique cyberinfrastructure support its Web site, nanoHUB.org, where researchers, educators, professionals collaborate, share resources, solve real nanotechnology problems. 2007, nanoHUB.org served more than 56,000 users from 172...
The consideration of space charge in the analysis resonant tunneling devices leads to a substantial modification current-voltage relationship. region negative differential resistance (NDR) is shifted higher voltage, and broadened along voltage axis. Moreover, peak value current prior NDR reduced, leading reduction predicted peak-to-valley ratio. An approach presented include space-charge effects, recently fabricated GaAs-AlxGa1−xAs structure analyzed, underscore importance self-consistent...
In this paper, we present a numerical method for evaluating the full Wigner function throughout device by solving steady-state quantum kinetic equation in two dimensions, linear-response regime. This has advantages over conventional treatments of mesoscopic devices. First, dissipative processes can be included within device, thus allowing smooth transition from to semiclassical Second, contacts are treated same manner as analysis. A short phase-breaking time used contact regions so that...
In the past, conductance of disordered systems has been extensively studied with use Anderson tight-binding Hamiltonian. this paper we a different model, which views semiconductor as regions free propagation occasional elastic scattering by random array scatterers. Each impurity is characterized matrix can, in principle, be derived for any arbitrary potential. The randomness introduced through location. overall device calculated combining (using appropriate law composition) matrices...
Software is increasingly important to the scientific enterprise, and science-funding agencies are funding software work. Accordingly, many different participants need insight into how understand relationship between software, its development, use, impact. In this article, we draw on interviews participant observation describe information needs of domain scientists, component producers, infrastructure providers, ecosystem stewards, including science funders. We provide a framework by which...
Device analysis has traditionally been based on the semiclassical Boltzmann transport equation. Despite its impressive successes, this approach suffers from an important limitation; it cannot describe phenomena in which wave nature of electrons plays a crucial role. A variety such quantum effects have discovered over years, as tunnelling, resonant weak and strong localisation, Hall effect. Since 1985, experiments ultrasmall structures (dimensions 100 nm) revealed number new Aharanov-Bohm...
In this paper, we model the transport of electrons in a two-dimensional resistor as regions free propagation with occasional elastic scattering by random array scatterers. The overall transmission probability is calculated cascading scatter matrices individual Numerical results are presented showing conductance fluctuations both weak- and stronglocalization regimes. We also discuss effect on electrostatic Aharonov-Bohm effect.
The Network for computational nanotechnology (NCN) has developed a science gateway at nanoHUB.org education and research. Remote users can browse through online seminars courses, launch sophisticated simulation tools, all within their Web browser. Simulations are supported by middleware that route complex jobs to grid supercomputing resources. But what is truly unique about the way it uses hardware accelerated graphics support both problem setup result visualization. This paper describes...
BioFETs (biologically active field-effect transistors) are biosensors with a semiconductor transducer. Due to recent experiments demonstrating detection by field effect, they have gained attention as potentially fast, reliable, and low-cost for wide range of applications. Their advantages compared other technologies direct, label-free, ultrasensitive, (near) real-time operation. We developed 2D 3D multi-scale models planar sensor structures nanowire sensors. The indispensable due the large...
Recent experiments in mesoscopic systems have demonstrated a striking similarity between electronic devices and optical or microwave waveguides. In the absence of impurities phase-breaking scattering, geometry such determines their behavior. These devices, which are usually composed network guiding channels, can be analyzed manner similar to that used for electromagnetic Sections device represented by scattering matrices, individual matrices combined, determine matrix an entire device. An...
Summary In this paper, we described the benefits and challenges of integrating existing scientific workflow technologies into science gateways. Scientific managers are powerful tools for handling large computational tasks. Domain scientists find it difficult to create new workflows, so many tasks that could benefit from automation often avoided or performed by hand. Two have come together bring masses. The Pegasus Workflow Management System can manage workflows comprised millions tasks, all...
Summary We present the theory, method, feasibility and accuracy of estimating fetal weight by measuring volume using compound ultrasonic scanning. The two parameters had a very high coefficient correlation (0.9794), standard error in one series 20 patients was only ±106 g. achieved us who new to ultrasound techniques 0.82, which compared favourably with correlations between biparietal diameter measurements (r = 0.26). A discussion as correction factors required allow for unknown value...
NanoHUB.org provides a community service to over 65,000 users in 172 countries annually with "online simulations and more". Over 85 interactive simulation tools supported by tutorials general nanotechnology information material are available free of charge anybody. In all there 1,000 resources on nanoHUB. Usage 30 classes the last year 270 citations literature demonstrate dual usage nanoHUB education research. The content is contributed members Network for Computational Nanotechnology (NCN)...
The life sciences are poised at the beginning of a paradigm-changing evolution in way scientific questions answered. Data-Intensive Science (DIS) promise to provide new ways approaching challenges and answering questions. This article is summary issues as discussed DIS workshop Seattle, September 19–20, 2010.
We present a direct numerical calculation of ${\mathit{R}}_{\mathit{x}\mathit{x}}$ and ${\mathit{R}}_{\mathit{x}\mathit{y}}$ in rectangular Hall bar with single impurity from the low-field to quantum regime. A resonance peak is observed regime, which disappears if removed. The current-flow pattern at clearly shows coupling edge states on opposite edges through impurity, thus confirming model proposed by Jain Kivelson [Phys. Rev. Lett. 60, 1542 (1988)]. clear signature impurity-bound state...
The 3-D Nanoelectronic Modeling Tool (NEMO 3-D) is an electronic structure simulation code for the analysis of quantum dots, wells, nanowires, and impurities. NEMO uses Valence Force Field (VFF) method strain empirical tight binding (ETB) calculations. Various ETB models are available, ranging from single s orbitals (single band effective mass), over sp <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup>...
The science gateway nanoHUB.org, funded by the National Science Foundation (NSF), serves a large scientific community dedicated to research and education in nanotechnology with community-contributed simulation codes as well vast repository of other materials such recorded presentations, teaching materials, workshops courses. Nearly 330,000 users annually access over 4400 items content on nanoHUB, including 343 tools. Arguably largest facility world, nanoHUB has led way not only providing...
Technology computer-aided design (TCAD) is essential to the of modern integrated circuit fabrication processes. TCAD tools must not only model real processes accurately, allow predictive simulation during technology research and development, but they work together as an system efficient exploration options. Sensitivity statistical analyses using provide rapid characterization, including examination process extremes, before fabrication. This capability reduces interval, enables optimized,...