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This Week at Physics

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Events During the Week of April 26th through May 3rd, 2015

Monday, April 27th, 2015

Plasma Physics (Physics/ECE/NE 922) Seminar
Physics of the Current Injection Process in Localized Helicity Injection
Time: 12:00 pm
Place: 2317 Enginering hall
Speaker: Edward Hinson, UW-Madison, Engineering
Host: UW
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Council Meeting
CANCELED
Time: 4:00 pm
Place: 2314 Chamberlin (Chair's Conference Room)
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Tuesday, April 28th, 2015

Chaos & Complex Systems Seminar
Barker frailty, Barker echoes and warped older age mortality dynamics
Time: 12:05 pm
Place: 4274 Chamberlin Hall (Refreshments will be served)
Speaker: Alberto Palloni and Hiram Beltran Sanchez, UW Center for Demography and Health of Aging
Abstract: An association between early childhood and old age mortality in successive birth cohorts (Barker frailty) generates conditions under which old age mortality can increase, decrease or remain constant even though background mortality is declining (Barker echoes). The stronger the association is, the larger will be the deviations from background mortality, but, paradoxically, the less durable this deviant behavior will be (warped dynamics). Under regimes of strong Barker frailty, life expectancy at older ages my decrease even though survival conditions are improving.
Host: Clint Sprott
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"Physics Today" Undergrad Colloquium (Physics 301)
X-ray Astronomy
Time: 1:20 pm
Place: 2120 Chamberlin Hall
Speaker: Dan McCammon, UW Madison Department of Physics
Host: Smith
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Wednesday, April 29th, 2015

Department Meeting
Time: 12:15 pm
Place: 5310 Chamberlin Hall
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Thursday, April 30th, 2015

R. G. Herb Condensed Matter Seminar
Pushing GaAs to the extreme: from the 5/2 FQHE to spin qubits
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Mike Manfra, Purdue University
Abstract: The high mobility two-dimensional electron gas (2DEG) confined in GaAs/AlGaAs heterostructures is a model system for the discovery of unique phases of electronic matter. For example the study of topological phases which now permeates condensed matter physics has its origin in attempts to understand behavior in the 2DEG at high magnetic fields in the quantum Hall regime. It is speculated that specific topological states in the quantum Hall regime may find utility in a special flavor of quantum computation protected against decoherence. The 2DEG in GaAs has also been a playground for mesoscopic physics in which individual electrons are isolated in quantum dots. These structures are now studied as spin-based quantum bits (qubits). In this talk, I will describe how we actually create such physical systems in the laboratory using molecular beam epitaxy and how each experiment places unique demands on the design and operation of the underlying heterostructure. In addition to our efforts to develop stable qubits, I will discuss how we attempt to push the limits of 2DEG quality to uncover new physics. Our recent efforts to understand the role of residual disorder, ever present in real samples, have led to some surprising results that we believe has important consequences for the study of topological phases and quantum computing.
Host: Eriksson
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Astronomy Colloquium
"Heavy element synthesis in the Universe"
Time: 3:45 pm
Place: 4421 Sterling Hall
Speaker: Enrico Ramirez-Ruiz, UCO Lick
Abstract: The source of about half of the heaviest elements in the Universe has been a mystery for a long time. Although the general picture of element formation is well understood, many questions about the nuclear physics processes and particularly the astrophysical details remain to be answered. Here I focus on advances in our understanding of the origin of the heaviest and rarest elements in the Universe.

Host: Professor Elena D'onghia
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Friday, May 1st, 2015

Cosmology Journal Club
An Informal discussion about a broad variety of arXiv papers related to Cosmology
Time: 12:15 pm
Place: 5242 Chamberlin Hall
Abstract: Please visit the following link for more details:
    http://cmb.physics.wisc.edu/journal/index.html
Please feel free to bring your lunch!
If you have questions or comments about this journal club, would like to propose a topic or volunteer to introduce a paper, please email Le Zhang (lzhang263@wisc.edu)
Host: Peter Timbie
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