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.

Atomic Dynamics via meV-Resolution X-Ray Scattering: New Results on High-Temperature Superconductors

25 Feb2016

Speaker: Alfred Baron, Materials Dynamics Laboratory, RIKEN SPring-8 Center

Time: February 25, 2016, 2:00 - 3:00

Location: AMPEL 311

High-resolution inelastic x-ray scattering (IXS) measures atomic motions at THz frequencies over angstrom-scale correlation lengths. While the required instrumentation is difficult to set up, dedicated facilities make the method available to the broader scientific community, and potentially of interest for anyone studying lattice dynamics, electron-phonon coupling, superconductivity, ferro-electricity/multi-ferroicity, phase transformations, magneto-elastic coupling, elasticity, or the dynamics of liquids or...

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Cavity Optomechanics in a Millikelvin Environment

11 Feb2016

Speaker: John Davis, University of Alberta

Time: February 11, 2016, 2:00 - 3:00

Location: Hennings 318

In the past decade a revolution has taken place in our ability to measure mechanical motion, originating in large part from experiments at gravitational observatories. Such observatories use massive optical cavities to explore the tiny changes in displacement that could be caused by passing gravitational waves. The nanomechanical community has latched onto this concept (of using optical cavities to...

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Charge Order in NbSe2

10 Feb2016

Speaker: Felix Flicker, UC Berkeley

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

Location: Hennings 318

Niobium diselenide has long served as a prototype of two-dimensional charge ordering, believed to arise from an instability of the electronic structure analogous to the one-dimensional Peierls mechanism. Despite this, various anomalous properties have recently been identified experimentally which cannot be explained by Peierls-like weak-coupling theories. We consider instead a model with strong electron-phonon coupling, taking into account both...

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Correlated Electrons from the Bottom Up: Application to High-Tc Cuprates

09 Feb2016

Speaker: Lucas Wagner, UIUC

Time: February 9, 2016, 1:00 - 2:00

Location: Hennings 318

First principles calculations, in which materials are simulated using only fundamental constants, are a powerful way to study electronic structure of materials. However, the first principles Hamiltonian exists in a very large Hilbert space, and until recently the only viable method of performing first principles calculations was by using density functional theory(DFT). While DFT has been very successful, its...

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The Nature of Fermi-Liquids, an Optical Perspective

04 Feb2016

Speaker: Damien Stricker, Universite de Geneve

Time: February 4, 2016, 2:00 - 3:00

Location: Hennings 318

A reference point for research on a wider range of correlated behaviour is provided by the so-called Fermi liquids, characterized by a relaxation rate (ħω)2 + (pπkBT)2. The theoretical prediction for the relaxation rate appearing in the optical conductivity is p = 2 when considering the experimentally most accessible range ħω>kBT. A number of recent optical studies have addressed...

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Testing the Reality of the Quantum Wavefunction

21 Jan2016

Speaker: Stephanie Simmons, Simon Fraser University

Time: January 21, 2016, 2:00 - 3:00

Location: Hennings 318

Is a quantum wavefunction exclusively an abstract mathematical tool — perhaps something which encodes our knowledge of a quantum system? Or is the quantum wavefunction instead a concrete physical entity which exists in reality? Until fairly recently it seemed like the answers to such epistemic/ontic questions could not be provided experimentally. Surprisingly, the Pusey-Barrett-Rudolph test, further developed by Barrett-Cavalcanti-Lal-Maroney...

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Nanoscale Investigations of High-Tc Superconductivity in Monolayer FeSe/SrTiO3

07 Jan2016

Speaker: Dennis Huang, Harvard University

Time: January 7, 2016, 2:00 - 3:00

Location: Hennings 318

The potential of interface engineering to generate novel electronic properties is exemplified in a monolayer of FeSe grown on SrTiO3, which exhibits an order-of-magnitude increase in its superconducting transition temperature (Tc up to 110 K) compared to bulk (Tc = 9 K). Since this discovery in 2012, efforts to reproduce, understand, and extend this finding continue to draw both...

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Superconductivity, Diamagnetism, Mean Inner Potential and Charge Asymmetry of Condensed Matter

03 Dec2015

Speaker: Jorge Hirsch

Time: December 3, 2015, 2:00 - 3:00

Location: Hennings 318

Each of the four concepts in the title is related to its nearest neighbor concept(s): this is well understood and generally agreed upon. What is not generally agreed upon is that these four concepts are all intimately related to each other, on the contrary, this is at odds with the conventional understanding of superconductivity (BCS). There is in fact...

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Short Stories in Soft Condensed Matter of How Complex Behavior in Membrane Systems Arises from Minimal Components

26 Nov2015

Speaker: Sarah Keller, University of Washington

Time: November 26, 2015, 2:00 - 3:00

Location: Hennings 318

This talk will briefly summarize our laboratory’s recent condensed matter research inspired by biological questions. Asking how sub-micron composition fluctuations might arise in a lipid membrane near a critical point led to our determination of the membrane’s effective critical dynamic exponent — the first successful systematic measurement of this fundamental physical parameter in any 2-dimensional Ising system with conserved...

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Non-Fermi-Liquid Scattering Rates and Anomalous Band Dispersions in Ironpnictides and Ironchalcogenides – An ARPES Study

16 Nov2015

Speaker: Jörg Fink, Leibniz Institute for Solid State and Materials Research Dresden

Time: November 16, 2015, 2:00 - 3:00

Location: AMPEL 311

Unconventional/high temperature superconductivity (SC) is observed in heavy fermion systems, cuprates, molecular crystals, and ferropnictides close to a point in the phase diagram where, as a function of a control parameter such as pressure, chemical pressure, or doping, the antiferromagnetic order is suppressed. A widespread view is that at this point, which is called a quantum critical point, strong...

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