Past Department Colloquia

Thu, 2017-03-23 16:00 - 17:00
Nai Phuan Ong (Princeton University)

To date, the anomaly has been observed most clearly in the two semimetals Na_3Bi and GdPtBi. I will discuss what Weyl Fermions are, and how they may be realized in real materials. The realization allows the chiral anomaly to be observed in a crystal. I will explain what the chiral anomaly is and remark on its historical context, starting with pion decay. Finally I will discuss several tests that buttress the conclusion.

*Supported by the Moore Foundation, ARO and NSF.






Thu, 2017-03-16 16:00 - 17:00
Brian Swingle (Univ. Maryland)

Recent rapid progress in many-particle quantum physics has been driven by a wide variety of new experiments, by theoretical insights into gravity and field theory (like the AdS/CFT duality), and by the prospect of constructing a universal quantum computer. In the midst of this boom, we are also looking at old problems in new ways, using concepts from quantum information. However, a general framework is still lacking.

Thu, 2017-03-09 16:00 - 17:00
Mark MacLachlan (UBC Chemistry)
Thu, 2017-03-02 16:00 - 17:00
Graduate students

This will be our Department's round of the annual "3MT" competition.  Several of our graduate students will try to motivate and summarise their research projects within the constraints of a 3-minute-long presentation using a single slide.  Come and support them!

Thu, 2017-02-16 16:00 - 17:00
Meredith Rawls (U Washington)

On a mountaintop in Chile, the Large Synoptic Survey Telescope is preparing to map the night sky. When its decade-long mission begins in 2022, the LSST will image the entire visible sky every few nights with a 3.2 gigapixel camera. In this talk, I will describe the hardware and software being built to collect, process, and archive an unprecedented volume of astronomical images.

Thu, 2017-02-09 16:00 - 17:00
Douglas Scott (UBC)

All empirical data relating to our Universe are currently well fit by a basic model that contains only a few key ingredients: the background is described by homogeneous and isotropic solutions within General Relativity, in which there is domination by vacuum energy and cold dark matter in a roughly flat expanding geometry; the density fluctuations appear to be nearly scale-invariant, adiabatic and Gaussian (close to the simplest thing we could imagine); and all of today’s structure grew through gravitational instability.

Thu, 2017-02-02 16:00 - 17:00
Johann Peter Reithmaier (Uni. Kassel)

With the improved control of nano-scale dimensions, material and device properties can be optimized towards their quantum mechanical limits. For example, atom-like features, such as discrete energy levels, may allow the optimum carrier distribution for stimulated emission in lasers, resulting in improved device performance in comparison to conventional quantum well technology. However, if one wants to utilize the quantum nature of single nano objects (e.g., for single photon emission), then the control of the environment and of the individual object geometry is also important.   

Thu, 2017-01-26 16:00 - 17:00
Pedro Ferreira (Oxford)
Thu, 2017-01-19 16:00 - 17:00
Adriana Moreo (ORNL/Univ. Tennessee)

During most of the last century superconductivity was observed in some metals at the very low temperatures achieved with liquid Helium. Below a critical temperature Tc electrons overcome their Coulomb repulsion thanks to an attraction created by the distortions of the ionic lattice and form Cooper pairs that can move without resistance. The efforts to raise Tc were unsuccessful until the discovery of the high Tc superconducting cuprates in 1986.

Thu, 2017-01-12 16:00 - 17:00
OsKar Vafek (NHMFLab/FSU, Tallahassee)

Superconductivity results from condensation of bound electron pairs, the so-called Cooper pairs. In the conventional Bardeen-Cooper-Schrieffer theory, the attraction between electrons originates from their interaction with the ionic lattice and the exchange of quanta of the lattice vibrations, phonons. The resulting wavefunction for the Cooper pairs carries zero angular momentum, leading to s-wave superconductivity.

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