Dr. Jim Hwang presents an overview of his program, GHz-THz Electronics, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Mitat A. Birkan presents an overview of his program, Space Propulsion and Power, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Joycelyn S. Harrison presents an overview of her program, Low Density Materials, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Charles Lee presents an overview of his program, Organic Materials Chemistry, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Efficient charge transfer induced organic/inorganic based hybrid heterojunction of Ppy/GaN nanorods for high-performance self-powered UV photodetection
Dr. Mitat A. Birkan presents an overview of his program, Space Propulsion and Power, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Joycelyn S. Harrison presents an overview of her program, Low Density Materials, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Charles Lee presents an overview of his program, Organic Materials Chemistry, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Efficient charge transfer induced organic/inorganic based hybrid heterojunction of Ppy/GaN nanorods for high-performance self-powered UV photodetection
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Organometal halide perovskite solar cells: Degradation and stabilityTaame Abraha Berhe
Organometal halide perovskite solar cells have evolved in an exponential manner in the two key areas of
efficiency and stability. The power conversion efficiency (PCE) reached 20.1% late last year. The key disquiet
was stability, which has been limiting practical application, but now the state of the art is promising, being
measured in thousands of hours. These improvements have been achieved through the application of
different materials, interfaces and device architecture optimizations, especially after the investigation of hole
conductor free mesoporous devices incorporating carbon electrodes, which promise stable, low cost
and easy device fabrication methods. However, this work is still far from complete.
Using Metamaterial as Optical Perfect AbsorberSepehr A. Benis
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
Dr. John D. Schmisseur presents an overview of his program, Energy, Power and Propulsion Sciences, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. John D. Schmisseur presents an overview of his program, Aerothermodynamics & Turbulence, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Organometal halide perovskite solar cells: Degradation and stabilityTaame Abraha Berhe
Organometal halide perovskite solar cells have evolved in an exponential manner in the two key areas of
efficiency and stability. The power conversion efficiency (PCE) reached 20.1% late last year. The key disquiet
was stability, which has been limiting practical application, but now the state of the art is promising, being
measured in thousands of hours. These improvements have been achieved through the application of
different materials, interfaces and device architecture optimizations, especially after the investigation of hole
conductor free mesoporous devices incorporating carbon electrodes, which promise stable, low cost
and easy device fabrication methods. However, this work is still far from complete.
Using Metamaterial as Optical Perfect AbsorberSepehr A. Benis
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
Dr. John D. Schmisseur presents an overview of his program, Energy, Power and Propulsion Sciences, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. John D. Schmisseur presents an overview of his program, Aerothermodynamics & Turbulence, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Los días 22 y 23 de junio de 2016 organizamos en la Fundación Ramón Areces un simposio internacional sobre 'Materiales bidimensionales: explorando los límites de la física y la ingeniería'. En colaboración con el Massachusetts Institute of Technology (MIT), científicos de este prestigioso centro de investigación mostraron las propiedades únicas de materiales como el grafeno, de solo un átomo de espesor, y al mismo tiempo más resistente que el acero y mucho más ligero.
Dr. Harold Weinstock presents an overview of his program, Quantum Electronic Solids, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Study of Boron Based Superconductivity and Effect of High Temperature Cuprate...IOSR Journals
This paper illustrates the main normal and Boron superconducting state temperature properties of magnesium diboride, a substance known since early 1950's, but lately graded to be superconductive at a remarkably high critical temperature Tc=40K for a binary synthesis. What makes MgB2 so special? Its high Tc, simple crystal construction, large coherence lengths, high serious current densities and fields, lucidity of surface boundaries to current promises that MgB2 will be a good material for both large scale applications and electronic devices. Throughout the last seven month, MgB2 has been fabricated in various shape, bulk, single crystals, thin films, ribbons and wires. The largest critical current densities >10MA/cm2 and critical fields 40T are achieved for thin films. The anisotropy attribution inferred from upper critical field measurements is still to be resolved, a wide range of values being reported, γ = 1.2 ÷ 9. Also there is no consensus about the existence of a single anisotropic or double energy cavity. One central issue is whether or not MgB2 represents a new class of superconductors, being the tip of an iceberg that waits to be discovered. Until now MgB2 holds the record of the highest Tc among simple binary synthesis. However, the discovery of superconductivity in MgB2 revived the interest in non-oxides and initiated a search for superconductivity in related materials, several synthesis being already announced to become superconductive: TaB2, BeB2.75, C-S composites, and the elemental B under pressure.
The public trial lecture presented by Mohammadreza Nematollahi on 8th of October 2014 at Norwegian University of Science and Technology. The theoretical models and the experimental progress of highly mismatched alloys, as well as their optoelectronic applications are covered.
Paper presented at the First International Congress of Geosciences: Innovatio...Leonid Krinitsky
the use of low-frequency GPR Loza, for prospecting and exploration of mineral resources. Capabilities. Methodology. Examples. Comparison with other methods.
Lecture on Introduction of Semiconductor at North South University as the undergraduate course (ETE411)
=======================
Dr. Mashiur Rahman
Assistant Professor
Dept. of Electrical Engineering and Computer Science
North South University, Dhaka, Bangladesh
http://mashiur.biggani.org
Dr. Chiping Li presents an overview of his program, Energy Conversion and Combustion Sciences, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Michael Berman presents an overview of his program, Molecular Dynamics & Theoretical Chemistry, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Patrick Bradshaw presents an overview of his program, Sensory Information Systems, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Patrick Bradshaw presents an overview of his program, Human Performance and Biosystems, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Hugh C. DeLong presents an overview of his program, Natural Materials and Systems, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Ali Sayir presents an overview of his program, Aerospace Materials for Extreme Environments, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Jim Hwang presents an overview of his program, Adaptive Multimode Sensing, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Gernot S. Pomrenke presents an overview of his program, Photonics and Optoelectronics, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. B.L. "Les" Lee presents an overview of his program, Mechanics of Multifunctional Materials and Microsystems, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Hugh C. DeLong presents an overview of his program, Complex Materials and Devices, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Jay Myung presents an overview of his program, Computational Cognition and Robust Decision Making, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Frederica Darema presents an overview of his program, Dynamic Data Driven Applications Systems (DDDAS), at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Tristan Nguyen presents an overview of his program, Sensing, Surveillance and Navigation, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Tristen Nguyen, presents an overview of his program, Science of Information, Computation and Fusion, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Joseph Lyons, PhD presents an overview of his program, Trust and Influence, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Kathleen M. Kaplan presents an overview of his program, Systems and Software, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Robert J. Bonneau presents an overview of his program, Complex Networks / Foundations of Information Systems, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Robert Herklotz presents an overview of his program, Information Operations & Security, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
James Fillerup, PE, Director, presents an overview of his program, SOARD Research Portfolio, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. John W. Luginsland presents an overview of his program, Plasma and Electro-energetic Physics, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
More from The Air Force Office of Scientific Research (20)
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
Epistemic Interaction - tuning interfaces to provide information for AI support
Hwang - GHz-THz Electronics - Spring Review 2013
1. 1Distribution A: Approved for public release; distribution is unlimited
Integrity Service Excellence
GHz-THz Electronics
Date: 07 03 2013
Jim Hwang
Program Officer
AFOSR/RTD
Air Force Research Laboratory
2. 2Distribution A: Approved for public release; distribution is unlimited
2013 AFOSR SPRING REVIEW
3001B PORTFOLIO OVERVIEW
NAME: Jim Hwang
BRIEF DESCRIPTION OF PORTFOLIO: GHz-THz Electronics
LIST SUB-AREAS IN PORTFOLIO:
I. THz Electronics – Material and device breakthroughs for transistors based on conventional
semiconductors (e.g., group IV elements or group III-V compounds with covalent bonds) to
operate at THz frequencies with adequate power. Challenges exist mainly in perfecting
crystalline structure and interfaces as channel thickness is scaled to single atomic layer.
II. Novel GHz Electronics – Material and device breakthroughs for transistors based on novel
semiconductors (e.g., transition-metal oxides with ionic bonds) to operate at GHz
frequencies with high power. Challenges exist mainly in controlling purity and stoichiometry,
as well as in understanding metal-insulator transition.
III. Reconfigurable Electronics – Material and device breakthroughs for meta-materials,
artificial dielectrics, ferrites, multi-ferroics, nano-magnetics, and micro/nano
electromechanical systems to perform multiple electronic, magnetic and optical functions.
Challenges exist mainly in understanding the interaction between electromagnetic waves,
electrons, plasmons and phonons on nanometer scale.
3. 3Distribution A: Approved for public release; distribution is unlimited
Covalent
Semiconductors
I. THz Electronics
• Sub-millimeter-wave radar & imaging
• Space situation awareness
• Chemical/biological/nuclear sensing
• Ultra-wideband communications
• Ultra-high-speed on-board and front-
end data processing
• Transition out GaN (MURI, STTR, AFRL, DARPA)
• Explore 2D materials and devices beyond
graphene (FY14 BRI)
4. 4Distribution A: Approved for public release; distribution is unlimited
FY14 BRI: 2D Materials & Devices Beyond Graphene
Jim Hwang, Gernot Pomrenke, Joycelyn Harrison & Misoon Mah (AFOSR)
3D VCSEL Heterostructureh-BN/Graphene/h-BN
• Graphene beautiful but difficult to deal with
• Best to mate graphene with other 2D layers through van der Waals force
• Graphene – conductor, 2D BN – insulator, 2D MoS2 – semiconductor, 2D NbSe2 –
superconductor
• Bandgap of MoS2 transitions from being indirect in bulk to direct in 2D
• Free of epitaxial strains, 2D heterostructures can do more wonders than 3D
heterostructures
5. 5Distribution A: Approved for public release; distribution is unlimited
Challenges for 2D Heterostructures
• While new 2D layers
continue to be
synthesized, 2D
heterostructure is in
infancy
• Only graphene grown on
BN substrate have
comparable properties to
that of exfoliated
graphene
• Limited success for
growing 2D BN on
graphene without metal
catalyst
• Little theoretical
understanding/prediction
of properties of 2D
heterostructures
6. 6Distribution A: Approved for public release; distribution is unlimited
2 nm
Bright-Field STEM
Graphene-BN Superlattice
Andre Geim & Konstantin Novoselov (Manchester, UK)
cmilli.com
Remarkable
achievement
by exfoliation
7. 7Distribution A: Approved for public release; distribution is unlimited
Atomic Layer Deposition of Hexagonal BN on Sapphire
Mike Snure & Qing Paduano (AFRL/RYDH)
N-B bonds
mostly
in plane
Compared to state of the art by metal-organic chemical vapor deposition,
atomic layer deposition promises monolayer control without metal catalyst
InfraredTransmission(%)
C
B
N
8. 8Distribution A: Approved for public release; distribution is unlimited
Molecular Beam Epitaxy of α-Sn on InSb
Arnold Kiefer & Bruce Claflin, AFRL/RYDH
Unique Properties of α-Sn
• Bulk α-Sn (cubic, zero-gap semi-
conductor) transforms into β-Sn
(tetragonal, metal) above 13 °C
• Epitaxial α-Sn on InSb stable to
130 °C
• Bandgap opens with strain
• Predicted to be a topological
insulator
• 2D electron gas formed between
α-Sn and InSb
• Little studied since 1981
Potential Applications
• Low-power, high-speed transistors
• Long-wavelength IR/THz detectors
• Phase-change memory material
• Non-polar active medium in III-V
quantum-well heterostructures
popscreen.com
β-
Sn
α-
Sn
9. 9Distribution A: Approved for public release; distribution is unlimited
II. Novel GHz Electronics
• Less demanding on crystalline perfectness
• Deposition on almost any substrate at low temp.
• Radiation hard, fault tolerant, & self healing
• High electron concentration w/ correlated transport
• Wide bandgap for high power and transparency
• Topological effects
• SWAP-C and conforming
• Metal-insulator transition with high on-off ratio
10. 10Distribution A: Approved for public release; distribution is unlimited
Metal-Insulator Transition
• Observed in some bulk oxide crystals in late 1950s
• On/off conductivity ratio can be much higher than that
of semiconductors (108 vs. 106)
• Requires little energy for switching at threshold
• Transition can be triggered by temperature, pressure,
light, electric field, etc. and as fast as 100 fs
• What changes first? Structural or electronic?
Communities.bmc.com
11. 11Distribution A: Approved for public release; distribution is unlimited
Nanosecond Metal-Insulator Transition in VO2
Shriram Ramanathan (Harvard)
300 K.
2.94 2.95 2.96
0
1
2
3
τ
CurrentDensity(108A/cm-2)
Time (µs)
Rutile (Metal) .
Polycrystalline VO2 on Au by RF-sputtering with precise control of O2 pressure
12. 12Distribution A: Approved for public release; distribution is unlimited
Micro-Thermometry of Metal-Insulator Transition in VO2
Ivan Schuller (UCSD)
Voltage- or current-induced transition
appears to be due to Joule heating
13. 13Distribution A: Approved for public release; distribution is unlimited
Metal-Insulator Transition in EuO
Darrell Schlom & Kyle Shen (Cornell)
Tight coupling of molecular-beam epitaxy (MBE) and angle-resolved
photoelectron spectroscopy (ARPES) reveals metal-insulator
transition involving massive Fermi surface reconstruction.
• Lack of carrier
activation arises
from defect
states near Γ
point.
• Reduce defects
(including dopant
clustering) to
enable controlled
doping.
• Combine strain
and doping to
boost Curie
temperature.
YAlO3
MBE
1st Brillouin Zone
Γ
Γ
XX
Fermi Surface
14. 14Distribution A: Approved for public release; distribution is unlimited
Collaboration
• Gernot Pomrenke – 2D materials & devices
• Harold Weinstock – nanoscale oxides
• Joycelyn Harrison – 2D materials
• Ali Sayir - oxides
• Dan Green – oxide electronics
• Paul Maki – nitride electronics
• Chagaan Baatar – 2D materials
• Marc Ulrich – topological insulators
• Pani Varanasi – 2D materials
• Mike Gerhold – transistor lasers
• Dev Palmer – THz & nitride electronics
• Jeff Rogers – topological insulators
• Brian Holloway – 2D materials
• Tony Esposito & Kiki Ikossi
– THz applications
• Kwok Ng
– beyond Si
• Anu Kaul &
Charles Ying
– 2D materials &
devices
• Dimitris Pavlidis
– THz electronics
15. 15Distribution A: Approved for public release; distribution is unlimited
I. THz Electronics –
Explore 2D materials and devices
II.Novel GHz Electronics –
Understand metal-insulator transition
III.Reconfigurable Electronics –
Formulate strategy this year
High-k Gate
Multi-Ferroics
Complex
Oxides
Oxide Electronics
Take-Away Messages
FY13
FY14
FY14FY13FY12
FY13
FY12