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.

CM Seminar - Linear and nonlinear optical responses in chiral topological semimetals

31 Oct2019

Speaker: Liang Wu

Time: October 31, 2019 :: 2:00PM - 3:00PM

Location: Brimacombe 311

Abstract: The fundamental difference between electrons in a solid and those in high-energy physics is the absence of Poincare symmetry in lattice systems. This gives rise to a much larger number of possible low energy excitations (known as multi-fold fermions) in solid-state physics. Recent theory and experiments show that semimetals with multi-fold degenerate points could exist in nonmagnetic materials...

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CM Seminar - Current Transport Properties and Phase Diagram of a Kitaev Chain with Long-Range Pairing

29 Oct2019

Speaker: Domenico Giuliano

Time: October 29, 2019 :: 2:00PM - 3:00PM

Location: Brimacombe 311

Abstract: We describe a method to probe the quantum phase transition between the short-range and the long-range topological phase in the superconducting Kitaev chain with long-range pairing. We show that, when the leads are biased at a voltage V, the Fano factor is either zero or 2e. As a result, we find that the Fano factor works as a...

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CM Seminar : Tunneling Probe of 2D Magnetism

24 Oct2019

Speaker: Adam Tsen

Time: October 24, 2019 :: 2:00PM - 3:00PM

Location: BRIM 311

The recent discoveries of ferromagnetism in single atomic layers have opened a new avenue for two-dimensional (2D) materials research. Not only do they raise fundamental questions regarding the requirements for long-range magnetic order in low-dimensional systems, but they also provide a new platform for the development of spintronic devices. In this talk, I will present a series of studies on...

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CM Seminar - Topological valleytronics in bilayer graphene

10 Oct2019

Speaker: Jun Zhu, Penn State University

Time: October 10, 2019 :: 2:00PM - 3:00PM

Location: BRIM 311

Abstract : The advent of two-dimensional materials with hexagonal crystal symmetry offers a new electronic degree of freedom, namely valley, the manipulation and detection of which could potentially be exploited to form new many-body ground states as well as new paradigms of electronic applications. In this talk, I will describe how we create valley-momentum locked topological 1D channels, aka...

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CM Seminar - High field superconducting magnet science for particle and condensed matter physics

26 Sep2019

Speaker: Lance Cooley

Time: Sep 26 2019 :: 2:00PM - 3:00PM

Location: BRIM 311

Abstract : Magnets are unarguably the "killer app" of superconductivity, with medical imaging magnets comprising an annual $2 billion market that consumes about 1000 tons of superconductor per year, and magnets for large science projects contributing a similar share. Yet, no magnet is ever better than the conductors from which it is wound, making the frontier of magnet technology inseparably...

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CM Seminar - Band Structure Movies of Electrical Surface Currents

19 Sep2019

Speaker: Ulrich Hoefer

Time: Sep 19 2019 :: 2:00PM - 3:00PM

Location: BRIM 311

Abstract:

Time-resolved photoelectron spectroscopy combines femtosecond pump-probe techniques with angle-resolved photoelectron spectroscopy (ARPES). I will show how this method can be used to perform measurements of electron transport at surfaces and interfaces in a contact-free fashion and with femtosecond time-resolution [1-3]. As the main example, I will discuss Dirac surface states of topological insulators. We induce electrical currents...

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  • Seminar

Seminar: Generative training of quantum Boltzmann machines with hidden units

13 Sep2019

Speaker: Nathan Wiebe, Affiliate Assistant Professor, University of Washington

Time: Sept. 13, 2019:: 11:00AM - 12:00PM

Location: BRIM 311

We provide the first method for fully quantum generative training of quantum Boltzmann machines with both visible and hidden units while using quantum relative entropy as an objective. This is significant because prior methods were not able to do so due to mathematical challenges posed by the gradient evaluation. We present two novel methods for solving this problem. The first...

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CM Seminar - Hydrodynamic transport in Luttinger semi-metals

12 Sep2019

Speaker: Julia Link, Simon Fraser University

Time: Sep 12 2019 :: 2:00PM - 3:00PM

Location: BRIM 311

Abstract: In the hydrodynamic regime it is possible to investigate the universal collision-dominated dynamics of the isolated electron fluid, while the couplings to the lattice and to impurities becomes secondary. An important transport property is the shear viscosity which describes whether the electron fluid behaves laminar or turbulent. The ratio shear viscosity over entropy is bounded from below and...

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  • Seminar

CM Seminar: Can machine learning outperform a condensed-matter physicist?

05 Sep2019

Speaker: Roman Krems, UBC Chemistry

Time: Sept. 5, 2019:: 2:00PM - 3:00PM

Location: BRIM 311

Abstract: Machine learning models are usually trained by a large number of observations (big data) to make predictions through the evaluation of complex mathematical objects. However, in many applications in science, particularly in quantum condensed-matter physics, obtaining observables is expensive so information is limited. In the present work, we consider the limit of ‘small data’. Usually, ‘big data’ are for...

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CM Seminar: Imaging Viscous Flow of the Dirac Fluid in Graphene Using a Quantum Spin Magnetometer

04 Sep2019

Speaker: Mark Jen-Hao Ku, Harvard University

Time: Sept. 4, 2019:: 2:00PM - 3:00PM

Location: BRIM 311

Abstract: Hydrodynamic electron fluid has emerged as a paradigm of strongly-correlated electronic transport. In particular, the electron-hole plasma in charge-neutral graphene is predicted to realize a quantum critical fluid whose transport features a universal hydrodynamic description relevant to strongly-correlated electrons in high-Tc superconductors. This “Dirac fluid” is expected to have a shear viscosity close to a minimum bound, with...

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