Events

SBQMI hosts numerous academic and other events throughout the year. Please search by audience or event type, or enter a keyword, to find events of interest to you.

If you are interested in inviting our faculty as keynote speakers at your event, or are a school group interested in visiting our labs, please contact us to submit your request.

Competition of Topological and Nematic Phases in the Two-dimensional Electron Gas

01 Dec2016

Speaker: Gábor Csáthy, Department of Physics and Astronomy and the Birck Nanotechnology Center, Purdue University

Time: December 1, 2016 2:00 - 3:00

Location: Hennings 318

The two-dimensional electron gas is a prototypical strongly correlated system which, over the years, has contributed to the development of novel concepts in condensed matter physics such as fractional charge, composite fermions, edge states, Pfaffian correlations, non-Abelian statistics, and topological order. The two-dimensional electron gas hosted in GaAs/AlGaAs heterostructures has a particularly rich set of ground states. Well-known examples...

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Josephson Currents Induced by the Witten Effect

24 Nov2016

Speaker: Jeroen van den Brink, Institute for Theoretical Solid State Physics, IFW Dresden

Time: November 24, 2016 2:00 - 3:00

Location: Hennings 318

We reveal the existence of a new type of topological Josephson effect involving type II superconductors and three-dimensional topological insulators as tunnel junctions. We predict that vortex lines induce a variant of the Witten effect that is the consequence of the axion electromagnetic response of the topological insulator: at the interface of the junction each flux quantum attains a...

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Superfluid density and microwave conductivity of FeSe superconductor

17 Nov2016

Speaker: David Broun, Department of Physics, Simon Fraser University

Time: November 17, 2016 2:00 - 3:00

Location: Hennings 318

FeSe is an iron-based superconductor of immense current interest due to the large enhancements of Tc that occur when it is pressurized or grown as a single layer on an insulating substrate. In collaboration with the UBC superconductivity group, we have carried out precision measurements of the superconducting electrodynamics of bulk material, at frequencies of 202 and 658 MHz...

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Macroscopic character of composite high temperature superconducting wires and enhancement of superconductivity by magnetic field

10 Nov2016

Speaker: Boris Spivak

Time: November 10, 2016 2:00 - 3:00

Location: Hennings 318

D-wave symmetry of the superconducting order in the cuprate high temperature superconductors is a well established fact, and one which identifies them as unconventional. However, in macroscopic contexts including many potential applications (i.e. superconducting wires) the material is a composite of randomly oriented superconducting grains in a metallic matrix, in which Josephson coupling between grains mediates the onset of...

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Driven Dirac Materials

04 Nov2016

Speaker: Sasha Balatsky, Los Alamos National Laboratory

Time: November 4, 2016 12:00 - 1:00

Location: Hennings 318

*Note this seminar will be on Friday, November 4 from 10:00 – 11:00, off of the usual Condensed Matter Seminar Series schedule.

Recent pump-probe experiments demonstrate the possibility that Dirac materials(DMs) may be driven into transient excited states describable by the state with two separate inverted occupancies, one for the electrons and one for the holes. Given...

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Magnetism meets topology: Quantum anomalous Hall effect and Chiral spin liquids

20 Oct2016

Speaker: Arun Paramekanti

Time: October 20, 2016 2:00 - 3:00

Location: Hennings 318

First, I will discuss recent developments in the field of oxide heterostructures, and present our proposal to realize half-metallic Chern bands and a high Tc quantized anomalous Hall effect in mixed 3d/5d oxides. A key component of this proposal involves an orbital analogue of the Rashba effect which may have broader implications in orbitally degenerate oxides. Second, motivated by...

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Frequency Domain Nonlinear Optics

01 Sep2016

Speaker: François Légaré

Time: September 1, 2016 11:00 - 12:15

Location: AMPEL 311

The universal dilemma of gain narrowing occurring in fs amplifiers prevents ultra-high power lasers from delivering few-cycle pulses. This problem is overcome by a new amplification concept: Frequency domain Optical Parametric Amplification – FOPA [1,2]. It enables simultaneous upscaling of peak power and amplified spectral bandwidth and can be performed at any wavelength range of conventional amplification schemes, however,...

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Design and Manipulation of Functional Molecular Nanosystems

10 Aug2016

Speaker: Johannes Barth, Department of Physics, Technical University of Munich

Time: August 10, 2016, 2:00 - 3:00

Location: AMPEL 311

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Towards Realizing Topological Superconductivity in Quantum Wires

23 Jun2016

Speaker: Vincent Mourik, University of New South Wales

Time: June 23, 2016, 2:00 - 3:00

Location: Hennings 318

The engineering of topological superconductors and the observation and control of their non-abelian quasiparticles is a dominant effort in condensed matter physics, both out of fundamental interest and for their potential application in topological quantum computing. A one-dimensional semiconducting nanowire with strong spin-orbit interaction that is proximity coupled to a standard s-wave superconductor is a particularly attractive implementation of...

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Cross-Interface Electron-Photon Interactions in FeSe Films on Oxide Substrates

02 Jun2016

Speaker: Steve Johnston, University of Tennessee

Time: June 2, 2016, 2:00 - 3:00

Location: Hennings 318

A flurry of scientific activities has been generated by the discovery of a significantly enhanced superconductivity in ultra thin films of FeSe grown on oxide substrates such as SrTiO3 . At present there are two main groups of proposals for the origin of this enhancement: those involving excess electron doping by the substrate or those involving a more direct...

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