Condensed Matter Seminars

Picosecond Infrared Laser (PIRL) Scalpel: Achieving Fundamental (Single Cell) Limits to Minimally Invasive Surgery and Biodiagnostics

Speaker: 
R. J. Dwayne Miller, The Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany and, Departments of Chemistry and Physics, University of Toronto
Event Date and Time: 
Thu, 2018-01-18 12:30 - 13:30
Location: 
AMPEL #311

Mapping Atomic Motions with Ultrabright Electrons: Realization of the Chemists’ Gedanken Experiment

Speaker: 
R. J. Dwayne Miller, The Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany and, Departments of Chemistry and Physics, University of Toronto
Event Date and Time: 
Thu, 2018-01-18 14:00 - 15:00
Location: 
Chemistry C126
Local Contact: 
Josh Folk, Ian Affleck

With the development of ultrabright electron sources capable of literally lighting up atomic motions, the fundamental space-time limit to imaging chemistry has been achieved.

Quantum magnetism on a chip

Speaker: 
Richard G. Harris, Principal Scientist, D-Wave Systems Inc.
Event Date and Time: 
Thu, 2018-01-11 14:00 - 15:00
Location: 
AMPEL #311
Local Contact: 
Josh Folk

Feynman's original vision for a quantum computer was of a physical quantum system whose Hamiltonian could be adjusted in situ in order to simulate the physics of other quantum systems.  Quantum magnetic systems, with localized spins and short range interactions, are perhaps the simplest such physical quantum system that can be implemented in existing solid state technologies.  This lecture will review how a D-Wave 2X quantum annealing processor can be used to realize quantum phase transitions in the transverse field Ising model on an embedded 3-dimensional lattice.

Quantum simulations of dynamical response functions for strongly correlated quasi-one dimensional materials

Speaker: 
Alberto Nocera, University of Tennessee
Event Date and Time: 
Thu, 2018-01-25 14:00 - 15:00
Location: 
Hennings #318
Local Contact: 
Marcel Franz
Dynamical response functions of strongly correlated quantum systems provide crucial infor-
mation about their complex physical behavior. For example, in layered high Tc superconduc-
tors, pairing could be linked to the unusual structure of spin excitations with a spin gap at low
energies and a magnetic resonance with an universal hourglass dispersion.

Using Resonant Inelastic X-ray Scattering to study quasiparticle fractionalization in quasi-one-dimensional cuprates

Speaker: 
Steve Johnston, University of Tennessee
Event Date and Time: 
Fri, 2018-01-05 14:00 - 15:00
Location: 
AMPEL #311
Local Contact: 
Mona Berciu

One-dimensional (1D) magnetic materials have attracted significant interest as a platform for studying phenomena such as quasiparticle fractionalization and quantum criticality. The spin-1/2 1D Heisenberg antiferromagnet is a vital system;  its elementary excitations are chargeless spin-1/2 quasiparticles called spinons that are created in pairs.

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".
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