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Dustin Winslow Thesis Defense 03/12/12

Thesis Defense

Dustin Winslow

Thursday, March 12, 2012
3:00pm (334 JFB)

Title: Atomic Scale Study of Dielectric Trap States Using Single Electron Tunneling Force Spectroscopy

Abstract:

The rapid advancement of technology has led to increasingly faster and smaller solid state devices. One reason for this rapid development is the dedicated effort to characterize the defects in the dielectric materials used in solid state electronics. However there are no techniques which allow for characterization of localized electron and hole trap states, in completely nonconducting films, with atomic scale spatial resolution. This talk will focus on the force detected tunneling techniques developed in the Williams lab over the last decade, with an emphasis on the recently developed single electron tunneling force spectroscopy (SETFS) technique. The density of localized trap states in SiO2, Si3N4 and HfO2 measured using SETFS will be compared to experimental results and theoretically predicted values found in the literature. The SETFS results from measurements made on each of these films is in good agreement with standard techniques. However, several states have been characterized that have only been theoretically predicted or are not identified in the literature. Finally, evidence of mobile charge in HfO2 will be presented and a possible mechanism proposed to explain the irreversible nature of the surface charging.

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The Nature of Things Keynote Lecture Dr. Brian Greene

From the Natural History Museum of Utah's website.

"Dr. Brian Greene
Professor of Physics and Mathematics at Columbia University

Location: Kingsbury Hall at the University of Utah
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Tickets $10.00 per person + $2.00 handling and service fee
Buy Tickets at KingTix Now

Join Dr. Brian Greene for a whirlwind exploration of one science story -- the quest to unravel some of the biggest mysteries of space and time -- and come away with a visceral understanding of why science matters.

Greene distills impossibly complex theoretical physics, like the concept of the multiverse, into a form we can all understand, and is dedicated to sharing science stories with broad audiences to combat perceptions of science as cold, distant, or irrelevant. Greene argues that understanding the transformative power of science – just like great music, art, or literature -- should be considered an indispensable part of what makes life worth living.

String theorist and author of The Elegant Universe, Brian Greene is one of the world’s leading theoretical physicists and a brilliant, entertaining communicator of cutting-edge scientific concepts. The Washington Post described him as “the single best explainer of abstruse concepts in the world today.”

In addition to writing best-selling books, Greene shares science stories through a range of interdisciplinary media.  He co-founded the World Science Festival, an annual celebration of science from cutting-edge research to works in theatre, film, and the arts inspired by scientific ideas. A graduate of Harvard and a Rhodes Scholar at Oxford, Greene is a professor in both Physics and Mathematics at Columbia University.

Buy Tickets at KingTix Now

Special Discount:  University of Utah Students, Faculty and Staff get a 10% ticket price discount when purchasing tickets at the Kingsbury Hall Box Office.  Not available on Internet or Phone orders. View Google Map

Nature of Things 2012 is underwritten by the R. Harold Burton Foundation. 

Complete Nature of Things 2012 Series Information"

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Science Night Live: Kyle Dawson

The College of Science will present a "Science Night Live!" event next Wednesday, January 25th, from 5:30 p.m. to 7:00 p.m. at Keys on Main, 242 South Main St. (next to Sam Weller's bookstore). Invite a friend, make a date, and stop by after work!

Kyle Dawson, assistant professor of physics & astronomy at the U, will discuss how astronomers at the U and across the world are "Revealing the Secrets of the Universe."

How does the universe grow and evolve with time?  How did the universe look ten billion years ago, and how will it look in another ten billion years?  How can we build an experiment to address these questions?
 
“In the last 15 years, we have made startling discoveries about the universe as we have attempted to answer these questions,” says Dawson.
 
As members of the Sloan Digital Sky Survey, astronomers at the U are mapping more than 1.5 million galaxies. Join us to learn how we will find those galaxies and use that information to better understand the nature of the universe.
 
You are welcome to mix-and-mingle from 5:30 to 7:00 at Keys on Main. A complete food menu and drink menu will be available. Join us for a stimulating discussion and social event!  
 
In addition, this month's Science Night Live will feature a brief science trivia contest, as well as a free raffle for some awesome prizes!  Event is free and open to the public. Must be 21 or over. Call (801) 581-6958 for more info.

[Ride the UTA TRAX to the Gallivan Plaza stop. Or, there is limited street parking available on 200 South and 300 South that is free after 6:00 pm. Perhaps the easiest parking is in the Wells Fargo building lot, accessible from 300 South. See www.keysonmain.com.]

Daily Utah Chronicle Article here.

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MRSEC Seminar: Dr. Vardeny

MRSEC Seminar: Dr. Vardeny

Wednesday January 25, 2012
4:10-5:00 p.m.
L103 WEB

 

Professor Z. Valy Vardeny
Distinguished Professor, Department of Physics & Astronomy, University of Utah

Presented by the Departments of Materials Science and Engineering & Metallurgical Engineering


“Organic Spintronics”


Organic semiconductors have been used as active layer in devices such as organic light-emitting diodes (OLEDs), photovoltaic cells, field-effect transistors, and lasers. Recently there has been a growing interest in spin and magnetic field effects in these materials. This include optically detected magnetic resonance where long spin coherence time was demonstrated; OLEDs where substantive magneto-electroluminescence and magneto-conductance were obtained; and organic spin valves (OSV) where spin injection from ferromagnetic (FM) electrodes was obtained. The interest in spin transport in organic semiconductors has been motivated by the weak spin-orbit interaction that is caused by the light building block elements such as carbon and hydrogen, and the small hyperfine interaction (HFI) with the nuclei.


In this talk the status of the young field of ‘Organic Spintronics’ will be reviewed. The necessary ingredients needed for the success of this field will be summarized, and evaluated by recent experiments. In particular the role of the HFI in magneto-transport will be elucidated via the isotope effect. Three applications of Organic Spintronics will be discussed: organic diodes with two FM electrodes for use as OSV; with one FM electrode for magnetic detectors; and organic diodes with no FM electrodes as magnetic sensors.

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