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.

Exact zero modes in frustrated spin chains

05 Oct2017

Speaker: Natalia Chepiga, University of California at Irvine

Time: Thu, 2017-10-05 14:00 - 15:00

Location: AMPEL 311

We will show that the effective coupling between the spin-1/2 edge states of a spin-1 chain of finite length can be continuously tuned by frustration. For the J1−J2 model with nearest and next-nearest neighbour antiferromagnetic interactions, we will show that the effective coupling in a chain of length L changes sign N≃0.38L times in the window 0.28≲J2/J1≲0.75 where the...

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  • Seminar

Signatures of the chiral anomaly in phonon dynamics

28 Sep2017

Speaker: Pedro Lopes, Universite de Sherbrooke

Time: Thu, 2017-09-28 14:00 - 15:00

Location: AMPEL 311

The past decade developments of condensed matter physics research have put a great weight in the importance of topological phenomena. Starting with topological insulators and superconductors new concepts and phase emerged; our particular interest here are Weyl semi-metals. Differently from its insulating and superconducting topological cousins, the low-energy physics of Weyl semi-metals is not restricted to its surface, with electronic...

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  • Seminar

Combined dynamic Electron Microscope and optical microscope: An ideal tool to study optical properties of quantum materials

27 Sep2017

Speaker: Samuel Sonderegger, Ph.D., Attolight AG, Lausanne, Switzerland

Time: Wed, Sep 27, 2017 at 2:00 PM

Location: AMPEL 311

Spectroscopic information may be acquired using an electron beam in a modern electron microscope (EM), exploiting the cathodoluminescence (CL) signal. CL offers several advantages over the usual optical spectroscopy. The multimode imaging capabilities of an EM enable the correlation of optical properties with morphology and structure at the sub-nanometer scale under beam or photon excitation. In addition, the large...

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Exploring the wave physics of mesoscopic materials with ultrasound: from bubble metamaterials to mesoglasses

21 Sep2017

Speaker: John H. Page, Department of Physics and Astronomy, University of Manitoba

Time: Thu, 2017-09-21 14:00 - 15:00

Location: AMPEL 311

Waves in complex media are often strongly scattered due to mesoscopic heterogeneities, leading to unusual and fascinating phenomena which continue to challenge our basic understanding of wave physics. Ultrasonic techniques are well suited for investigating such phenomena since complete information about wave propagation (both amplitude and phase, in both time and space) can be measured directly in samples with...

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  • Seminar

Interacting Majorana fermions in two dimensions

14 Sep2017

Speaker: Ian Affleck

Time: Thu, 2017-09-14 14:00 - 15:00

Location: AMPEL 311

Majorana fermions, whose creation operators are Hermitean, have been proposed and apparently observed in various materials. While only two Majorana fermions are expected to occur in some situations, a whole lattice of them may occur in others, including in a thin film of superconductor on top of a topological insulator in the presence of a magnetic field. A Majorana...

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  • Seminar

Spectroscopic-Imaging and Spin-Polarized STM Studies of Superconductivity, Nematicity and Magnetism in 11-Iron Chalcogenide Superconductors

07 Sep2017

Speaker: Dr. Udai Raj Singh, Institute for Nanostructure and Solid State Physics, University of Hamburg

Time: Thu, 2017-09-07 14:00 - 15:00

Location: AMPEL 311

Several years after the discovery of iron-based superconductors, the 11 iron-chalcogenide superconductors have been found to exhibit the simplest crystal structure of the iron-based superconductors consisting of planar iron layers with chalcogenide (Te, Se) anions above and below. The crystal structure provides a well-defined and non-polar cleavage plane between chalcogenide layers without any surface reconstruction [1]. Therefore, they have...

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  • Seminar
  • Student

Probing Emergent Phenomena Through Large-Scale Atom Manipulation

05 Sep2017

Speaker: Sander Otte, Kavli Institute of Nanoscience, Delft University of Technology

Time: Tue, 2017-09-05 10:00 - 11:00

Location: AMPEL 311

The magnetic and electronic properties of materials often find their origin in basic atomic- scale interactions. Yet, due to the large number of atoms involved, many phenomena can be very difficult to predict: we call these ‘emergent’. The ability to build structures atom-by-atom by means of scanning tunneling microscopy (STM) may provide an excellent platform to explore emergence as...

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Progress in the Fabrication and Imaging of Scanning Tunneling Microscopy Patterned Dopant Nanostructures in Silicon

25 Aug2017

Speaker: Taylor Stock, London Centre for Nanotechnology, University College London

Time: Fri, 2017-08-25 14:00 - 15:00

Location: AMPEL 311

Device structures consisting of 2D patterned dopant atoms in silicon can be fabricated with near atomic precision using the technique of scanning tunnelling microscopy (STM) hydrogen desorption lithography. These types of devices, such as atomic scale wires and single atom transistors, can exhibit a variety of interesting quantum phenomena due to atomic scale spatial confinement of electrons within the...

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  • Seminar
  • Student

From manipulating oxide surface to thin film fabrications by Molecular Beam Epitaxy

25 Aug2017

Speaker: Fengmiao Li, UBC

Time: Friday, 2017-08-04 13:00 - 14:00

Location: AMPEL 311

Molecular Beam Epitaxy (MBE) is a very powerful technique with the capabilities to manipulate material properties with atomic precision and grow very high-quality metastable thin films and heterostructures in which new electronic states have large probabilities to emerge especially for the compounds with strong electron correlations such as the transition-metal and rare-earth oxides. For example, at the LaAlO3/SrTiO3 interface...

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  • Seminar

Atomic construction of two-dimensional materials

03 Aug2017

Speaker: Bruce A. Davidson, Physics Department, Temple University, Philadelphia, USA; Oxide MBE Lab, CNR–IOM/TASC

Time: Thursday, 2017-08-03 10:00 - 11:00

Location: AMPEL 311

Moore’s law has helped push the search for electronic materials to the twodimensional limit, where new physical properties and new device physics are being discovered. For example, single monolayers of transition–metal dichalcogenides (TMDCs) can show electronic structure different from their bulk counterparts (e.g. direct band gaps, “valley”–dependent interband transitions, and excitons with high binding energies, to name a few)...

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