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Events for March 08, 2013
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Excursions Through Flatland: Braiding Interactions of Anyons
Fri, Mar 08, 2013 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Gavin Brennen, Macquarie University, Sydney
Talk Title: Excursions Through Flatland: Braiding Interactions of Anyons
Abstract: In systems with physics constrained to two dimensions, point like particles named anyons can occur which have more general exchange statistics than bosons or fermions. While these particles emerge as quasiparticle excitions from strongly correlated ``vacuum" states, they are long- lived and robust to perturbations. I will describe the transport properties of anyons in the presence of ordered and random topological environments. Using both a discrete time quantum walk model and a continuous time Hubbard model we find very distinct behaviours for Abelian and non-Abelian anyons which could be observed in experiment.
Biography: Gavin Brennen grew up in Alaska and did his studies at the U. of Alaska and U. of New Mexico receiving his PhD in theoretical physics from UNM in 2001. Afterward he worked as a research fellow at U. Maryland/NIST Gaithersburg, MD and as senior scientist at the Institute for Quantum Optics and Quantum Information, Innsbruck Austria. In 2007 he was appointed Assoc. Prof. at Macquarie University, Sydney where he and his group work on quantum information theory, coherent control of atomic/molecular/optical systems, and topological phases.
Host: Todd Brun
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
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W.V.T. Rusch Honors Colloquium; Liquidmetal Technologies, An Overview and Applications of Amorphous Metallic Alloys
Fri, Mar 08, 2013 @ 01:00 PM - 01:50 PM
USC Viterbi School of Engineering, Viterbi School of Engineering Student Affairs
Conferences, Lectures, & Seminars
Speaker: Dennis Ogawa, Vice President Marketing, Liquidmetal Technologies
Talk Title: Liquidmetal Technologies, An Overview and Applications of Amorphous Metallic Alloys
Host: W.V.T. Rusch Honors Program
Location: Seeley G. Mudd Building (SGM) - 101
Audiences: Everyone Is Invited
Contact: Christine Viterbi Admission & Student Affairs
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Integrated Systems Seminar Series
Fri, Mar 08, 2013 @ 02:30 PM - 03:30 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Gerhard Sollner, Raytheon Company
Talk Title: Aging Treatments for CMOS Analog and Digital Circuits
Abstract: One beauty of Complementary Metal-oxide-Silicon (CMOS) transistors is that the carriers travel between source and drain in a nearly atomically smooth channel in the semiconductor adjacent to the oxide gate insulator. However, as device dimensions shrink, electric fields increase, carriers travel at higher velocities, and any imperfections in the channel-oxide interface become increasingly important.
CMOS transistors age when high-speed carriers in the channel break chemical bonds and dislodge atoms at the oxide-semiconductor interface. These uncompensated bonds are charged. They change the gate potential necessary to attract charges to the channel, that is, they change the threshold voltage. In addition, they act as scattering centers for carriers in the channel. These scattering centers reduce carrier mobility, which in turn reduces several parameters important to circuit performance such as gain and the maximum frequency of operation.
In this talk we will look carefully at the two most important physical processes of CMOS aging. It turns out that one is most important for digital circuits, the other is most important for analog circuits. Then, after a brief introduction to how aging processes are accelerated (so that you don’t have to measure for 10 years to predict a 10-year lifetime), we will show expressions from the literature that predict how these aging processes depend on temperature , electric fields, and time, for any CMOS device technology. Then some of our recent measurements on 65-nm digital devices will be described, along with their agreement with the literature.
The ultimate goal of this work is to develop anti-aging techniques, i.e. healing for CMOS circuits that undergo aging. To this end we designed several circuits, both analog and digital, in 45-nm CMOS. These all include internal circuits that measure the effects of aging and other circuits that adjust transistor biases to cure the aging and return the circuit to the performance level for which it was designed. To tie all this together, we will describe an algorithm that has demonstrated excellent results when finding the optimum bias levels in multi-dimensional nonlinear cases such as these.
The bottom line: we will show that aging effects can seriously degrade circuit performance. The cure is to either over-design the circuit, which reduces performance, or to apply anti-aging techniques, which result in compact, efficient circuits with high performance.
Biography: Dr. Sollner joined the Advanced Technology group at Raytheon Company in November 2009 where he now manages several programs. Before his current position Gerry founded and was CEO of a company, Kenet Inc, which successfully developed families of very-low-power analog-to-digital converters based on technology invented in his group at MIT Lincoln Laboratory. Kenet was acquired by Intersil Corporation. Prior to starting Kenet, Gerry spent 20 years at Lincoln Laboratory, leading the Analog Device Technology Group for his last 10 years there. In 1997 he was elected to Fellow of the IEEE for "his work in resonant-tunneling structures and contributions to understanding of high-speed semiconductor devices." Dr. Sollner has published over 50 articles in peer-reviewed journals, has given over 30 invited lectures, and holds 8 patents.
Host: Prof. Hossein Hashemi and Prof. Mike Chen
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Hossein Hashemi
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CEE Ph.D. Seminar
Fri, Mar 08, 2013 @ 04:00 PM - 05:00 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speaker: Nancy Daher and Wael Elhaddad, CEE Ph.D. Candidates
Talk Title: Chemical Characterization and Source Apportionment of Fine and Coarse Particulate Matter Inside the Cenacolo Vinciano, Home of Leonardo Da Vinciââ¬â¢s ââ¬ÅLast Supper
Abstract: Nancy Daher - 4:00-4:30pm
The association between exposure to indoor particulate matter (PM) and damage to cultural assets has been of primary relevance to museum conservators. PM-induced damage to the ââ¬ÅLast Supperââ¬Â painting, one of Leonardo da Vinciââ¬â¢s most famous artworks, has been a major concern, given the location of this masterpiece inside a refectory in the city center of Milan, one of Europeââ¬â¢s most polluted cities. To assess this risk, a one-year sampling campaign was conducted at indoor and outdoor sites of the paintingââ¬â¢s location, where time-integrated fine and coarse PM (PM2.5 and PM2.5 -10) samples were simultaneously collected. Findings showed that PM2.5 and PM2.5- 10 concentrations were reduced indoors by 88 and 94% on a yearly average basis, respectively. This large reduction is mainly attributed to the efficacy of the deployed ventilation system in removing particles. Furthermore, PM2.5 dominated indoor particle levels, with organic matter as the most abundant species. Next, the chemical mass balance model was applied to apportion primary and secondary sources to monthly indoor fine organic carbon (OC) and PM mass. Results revealed that gasoline vehicles, urban soil, and wood-smoke only contributed to an annual average of 11.2% of OC mass. Tracers for these major sources had minimal infiltration factors. On the other hand, fatty acids and squalane had high indoor-to-outdoor concentration ratios with fatty acids showing a good correlation with indoor OC, implying a common indoor source.
Wael Elhaddad - 4:30-5pm
Talk: "Towards Optimal Design of Semiactive Structural Control".
Location: John Stauffer Science Lecture Hall (SLH) - 102
Audiences: Everyone Is Invited
Contact: Evangeline Reyes
