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Events During the Week of
January 27th through February 2nd, 2013
Monday, January 28th, 2013
No events scheduled
Tuesday, January 29th, 2013
Chaos & Complex Systems Seminar
What do smiles mean and how do we know?
- Time: 12:05 pm
- Place: 4274 Chamberlin (refreshments will be served)
- Speaker: Paula M. Niedenthal, UW Department of Psychology
- Abstract: Theories of embodied emotion suggest new ways to model the recognition of facial expression. Behavioral and neuroimaging studies indicate that the recognition of facial expressions of emotion, and in particular the elusive smile, involves the (re)production of the expression as well as of the corresponding emotion, or parts of it, in the self. In the present talk, I introduce a new model, The Simulation of Smiles Model (SIMS, Niedenthal et al., BBS, 2010). The SIMS relies on a social-functional typology of smiles. Accordingly, I first present research that seeks to validate the typology. The SIMS also outlines specific roles for facial mimicry and eye contact in representing smile meaning. Recent empirical evidence in favor of these roles is presented. Finally, the SIMS leaves room for the use of perceptual and conceptual processes in interpreting facial expression. I present research supportive of the hypothesis that the interpretation of smile meaning relies on prior beliefs and stereotypes when facial mimicry does not occur. Results of a recent study on smiling behavior from 9 different countries provides the basis for predictions about moderation by culture of the basic processes outlined in SIMS.
- Host: Sprott
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"Physics Today" Undergrad Colloquium (Physics 301)
TeV Gamma-ray Astronomy with HAWC
- Time: 1:20 pm
- Place: 2223 Chamberlin
- Speaker: Stefan Westerhoff, University of Wisconsin Department of Physics
- Abstract: A series of weekly presentations and discussions of current research topics in physics by the scientists involved in those studies designed to expose students to the topics and excitement of the research frontier.
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Theory Seminar (High Energy/Cosmology)
Title to be announced
- Time: 4:00 pm
- Place: 5280 Chamberlin Hall
- Speaker: Hao Zhang, Argonne National Laboratory/Illinois Institute of Technology
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Wednesday, January 30th, 2013
Department Meeting
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- Time: 12:15 pm
- Place: 5310 Chamberlin Hall
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Thursday, January 31st, 2013
R. G. Herb Condensed Matter Seminar
Electronic Transport in Bi2Se3 Thin Films in the Topological Insulator Regime
- Time: 10:00 am
- Place: 5310 Chamberlin
- Speaker: Dohun Kim, University of Maryland
- Abstract: The 3D topological insulators (TIs) have an insulating bulk but metallic surface states stemming from band inversion due to strong spin-orbit interaction, whose existence is guaranteed by the topology of the band structure of the insulator. Like graphene, the STI surface state generically has a Dirac electronic spectrum with massless electrons and a vanishing bandgap at a Dirac point. In this talk, I will discuss experiments on the TI material Bi2Se3, which has a single topological Dirac surface state. Field effect transistors consisting of thin (5-17 nm) Bi2Se3 are fabricated by mechanical exfoliation of single crystals, and electrochemical and/or chemical gating methods are used to move the Fermi energy into the bulk bandgap, revealing the ambipolar gapless nature of transport in the Bi2Se3 surface states [1]. The minimum conductivity of the topological surface state is understood within the self-consistent theory of Dirac electrons in the presence of charged impurities. The intrinsic finite-temperature resistivity of the topological surface state due to electron-acoustic phonon scattering is measured to be 60 times larger than that of graphene largely due to the smaller Fermi and sound velocities in Bi2Se3 [2], which will have implications for topological electronic devices operating at room temperature. I will also discuss about our recent observation of 2D weak anti-localization (WAL) behavior in the low field magneto transport, which stems from topological surface states. By investigating gate-tuned WAL behaviors, I will show that WAL in TI regime is extraordinarily sensitive to sub-meV coupling between top and bottom topological surfaces, and interplay of phase coherence time and inter surface tunneling time results interesting crossovers from coupled single channel to decoupled multichannel coherent transports.
[1] D. Kim et al., Nature Phys. 8, 460 (2012).
[2] D. Kim et al., Phys. Rev. Lett. 109, 166801 (2012).
- Host: Eriksson
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Friday, February 1st, 2013
Cosmology Journal Club
An Informal discussion about a broad variety of arXiv papers related to Cosmology
- Time: 12:00 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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Physics Department Colloquium
Femtosecond diffraction of single proteins or protein micro-crystals
- Time: 3:30 pm
- Place: 2241 Chamberlin Hall (coffee at 4:30 pm)
- Speaker: John Spence, Arizona State University
- Host: Gilbert
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