Condensed Matter Seminars

Quantum supremacy: checking a quantum computer with a classical supercomputer

Speaker: 
John Martinis, University of California at Santa Barbara
Event Date and Time: 
Thu, 2017-11-30 14:00 - 15:00
Location: 
Hennings #201
Local Contact: 
Josh Folk
Intended Audience: 
Graduate

As microelectronics technology nears the end of exponential growth over time, known as Moore’s law, there is a renewed interest in new computing paradigms such as quantum computing.   A key step in the roadmap to build a scientifically or commercially useful quantum computer will be to demonstrate its exponentially growing computing power.

Nanoengineering materials: a bottom-up approach towards understanding long outstanding challenges in condensed materials science

Speaker: 
Al-Amin Dhirani, Department of Chemistry and Department of Physics, University of Toronto
Event Date and Time: 
Fri, 2017-11-10 15:00 - 16:00
Location: 
AMPEL #311
Local Contact: 
Josh Folk

Chemists have made tremendous advances in synthesizing a variety of nanostructures with control over their size, shape, and chemical composition. Plus, it is possible to control nanostructure assembly and to make macroscopic materials. This affords an opportunity to realize a wide range of controlled and potentially even new behaviours. 

 

Computational phases of quantum matter

Speaker: 
Robert Raussendorf, SBQMI / PHAS, UBC
Event Date and Time: 
Thu, 2017-11-09 14:00 - 15:00
Location: 
AMPEL #311
Local Contact: 
Robert Raussendorf
Intended Audience: 
Graduate

In condensed matter physics, the essential properties of a physical system are determined by the phase in which it resides. Recent years have witnessed tremendous progress in the classification of physical phases, and it is thus pertinent to ask: What can we use quantum phases of matter for? Superconductivity is a classic example for a fundamental quantum phenomenon that finds a wide range of technological applications. It does not require fine- tuning of parameters; rather it is a property of a whole quantum phase.

Frustrated magnetism in metals

Speaker: 
Eundeok Mun, Department of Physics, Simon Fraser University
Event Date and Time: 
Thu, 2017-11-16 14:00 - 15:00
Location: 
AMPEL #311
Local Contact: 
Josh Folk

To date, magnetic frustration has primarily been studied in insulators. There have been little theoretical and experimental studies in magnetically frustrated conducting materials, where the localized moments reside on geometrically frustrated lattices (pyrochlore, kagome, triangular). For the 4f - electron metallic systems, the competition between Kondo and RKKY interactions results in a great variety of ground states, leading to a rich phase diagram, which can be tuned through a quantum critical point.

Non-fermi liquids, fixed point collisions, and tensorial order in grey tin and in some popular field theories

Speaker: 
Igor Herbut, Simon Fraser University
Event Date and Time: 
Thu, 2017-10-26 14:00 - 15:00
Location: 
AMPEL #311
Local Contact: 
Ian Affleck
Intended Audience: 
Graduate
Abrikosov proposed in 1974 that a 3D electronic system with its fermi level at the point of quadratic band crossing, as in the (spin-orbit coupled) gray tin or mercury telluride, should represent the simplest non-fermi liquid. I will review this idea and discuss how a non-fermi liquid ground state may become unstable to ordering via the mechanism of "fixed-point collision".

Nanophotonic spin-optomechanics

Speaker: 
Paul Barclay, University of Calgary
Event Date and Time: 
Thu, 2017-11-02 14:00 - 15:00
Location: 
AMPEL #311
Local Contact: 
Josh Folk
Intended Audience: 
Graduate

Nano-optomechanical devices enhance the interaction between light and nanomechanical resonators, enabling coherent coupling between photons and mesoscopic phonons. When spin systems are attached to or embedded within these devices, technologies for nanoscale sensing, and for transducing quantum information between photons, phonons and spins become viable. In this talk I will illustrate this potential by presenting measurements of the susceptibility of nanomagnetic spin systems using optomechanical “split-beam” nanocavities [1].

Complex tensor order and quantum criticality in half-Heusler superconductors

Speaker: 
Igor Boettcher, Department of Physics, Simon Fraser University
Event Date and Time: 
Thu, 2017-11-23 14:00 - 15:00
Location: 
AMPEL #311
Local Contact: 
Josh Folk

A revolutionary new direction in the field of superconductivity emerged recently with the synthesis of superconductors with strong inherent spin-orbit coupling of electrons, such as the half-Heusler compounds YPtBi or LuPdBi. Due to band inversion, the low-energy degrees of freedom are electrons at a three-dimensional quadratic band touching point with an effective spin-3/2, which allows for Cooper pairs with spins ranging from 0 to 3.

Collapse of high-Tc superconductivity via ultrafast quenching of the phase coherence

Speaker: 
Fabio Boschini, SBQMI, UBC
Event Date and Time: 
Thu, 2017-10-19 14:00 - 15:00
Location: 
AMPEL #311
Local Contact: 
Andrea Damascelli
Intended Audience: 
Graduate

One of the most fascinating properties of low-density condensates is the emergence of phase transitions driven solely by the fragility of the phase coherence. This intriguing physics has triggered an intense search for tools to control the rigidity of superconducting phases and investigate the collapse of superconductivity induced by phase fluctuations. Electrically-gated oxide interfaces, ultracold Fermi atoms and cuprate superconductors, which are characterized by an intrinsically small phase-stiffness, are paradigmatic examples.

Quantum High Performance Computing for Chemistry and Materials

Speaker: 
Matthias Troyer, Quantum Architectures and Computation Group, Microsoft Research
Event Date and Time: 
Thu, 2017-10-12 14:00 - 15:00
Location: 
AMPEL #311
Following experimental realizations of small but scalable quantum computers we may soon see the first quantum computers with the potential to outperform the fastest classical computers. It is thus timely to identify application problems that a quantum computer could solve better than any classical supercomputer. Despite the challenges posed by mature classical computing technology we can identify several interesting application areas for quantum computers that can make the efforts to build a quantum computer not only a scientifically but also a commercially interesting endeavor.

Signatures of the chiral anomaly in phonon dynamics

Speaker: 
Pedro Lopes, Universite de Sherbrooke
Event Date and Time: 
Thu, 2017-09-28 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Ian Affleck

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.

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