Events List for the Academic Year
Event Time:
Monday, September 10, 2018 | 3:00 pm - 4:15 pm
Event Location:
Hennings 318
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2018-09-10T15:00:00
2018-09-10T16:15:00
Cosmology with the cosmic microwave background light: then and now
Event Information:
Please join us before the Colloquium in Hennings 318 for coffee, tea and snacks at 2:45 pm
Cosmology enjoyed a remarkable development over the last century. Astronomical observations revealed that galaxies like our own are not distributed at random throughout space, but rather delineate a quite remarkable structure, reminiscent of the skeletal framework of a sponge. How could that be? We now have developed a compelling picture of how these galaxies and their distribution developed over time, under the influence of gravity. We trace their origin to the earliest moment of the Universe. Most effective in achieving our current understanding has been the study of the sky background light called the Cosmic Microwave Background. This light, which is invisible to the naked eye but easily measurable with modern sensors, travelled uninterrupted for 13.8 billion years throughout the Universe. It last interacted with the material content of the Universe when the Universe was very much hotter, denser, and more homogeneous than it is now. It thus bears witness to the prevailing physical conditions back then and sheds light on the process that generated the primordial seeds out of which structures grew. As a result, recent observations bring amazing confirmation of ideas put forward in the 19880s and open a window on physics over a range of scales, times and energies that were hitherto inaccessible. I will describe how we came to the arresting conclusion that we are the children of quantum fluctuations of the vacuum!
Event Location:
Hennings 318
Event Time:
Thursday, September 6, 2018 | 4:00 pm - 5:00 pm
Event Location:
Hennings 201
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2018-09-06T16:00:00
2018-09-06T17:00:00
Our Amazing Universe
Event Location:
Hennings 201
Event Time:
Thursday, September 6, 2018 | 2:00 pm - 3:00 pm
Event Location:
TRIUMF Auditorium
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2018-09-06T14:00:00
2018-09-06T15:00:00
Electromagenetic Probes of Nuclei
Event Information:
Electromagnetic probes represent a fundamental tool to study nuclear structure and dynamics. The perturbative nature of the electromagnetic interaction allows for a clean connection between calculated nuclear structure properties and measured cross sections. Ab initio methods
have long represented the gold standard for calculations of nuclear structure observables in light nuclei. Thanks to recent developments in the scientific community, ab initio calculations have finally reached the medium- and heavy-mass region of the nuclear chart. However, the challenges modern nuclear structure calculations face are multiple, ranging from the construction of nuclear forces from chiral effective field theory and the solution of the highly correlated quantum many-body problem, to a quantitative description of observables with solid treatment of uncertainties.
I will address some of these challenges, using the ab initio coupled-cluster (CC) theory formulation of the Lorentz integral transform (LIT) method and show how we can combine the CC and LIT methods for the computation of electromagnetic inelastic reactions into the continuum [1,2]. I will show that the bound-state-like equation characterizing the LIT method can be reformulated based on extensions of the coupled-cluster equation-of-motion (EOM) method, and will discuss strategies for viable numerical solutions. I will then focus on the calculation of the electric dipole polarizability (EDP), which quantifies the low-energy behaviour of the dipole strength and is related to critical observables such as the radii of the proton and neutron distributions. Using a variety of chiral interactions, and singles and doubles excitations, I will show results for 4He, 16,22O and 40Ca [1,2,3]. Exploiting correlations between EDP and the charge radius, I will show results for the neutron-skin radius and the polarizability for the double-magic 48Ca [4], the latter recently measured by the Osaka-Darmstadt collaboration [5]. Finally, I will show our last study regarding the impact of triples excitations (and thus the uncertainty of the CC truncations) on the dipole strength in 4He, 16O and 48Ca [6]. In particular, the addition of new correlations allows us to improve the precision of our 48Ca calculations and reconcile the recently reported discrepancy between coupled-cluster results based on these interactions and the experimentally determined EDP from proton inelastic scattering in 48Ca.
[1] S. Bacca et al., Phys. Rev. C 90, 064619 (2014)
[2] M. Miorelli et al., Phys. Rev. C 94, 034317 (2016)
[3] M. Miorelli et al., EPJ Web of Conferences 113, 04007 (2016)
[4] G. Hagen et al., Nature Physics 12, 186190 (2016)
[5] J. Birkhan et al., Phys. Rev. Lett. 118, 252501 (2017)
[6] M. Miorelli et al., Phys. Rev. C 98, 014324 (2018)
Event Location:
TRIUMF Auditorium
Event Time:
Tuesday, September 4, 2018 | 12:30 pm - 1:30 pm
Event Location:
Hennings 318
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2018-09-04T12:30:00
2018-09-04T13:30:00
Quantized comological spacetimes and higher spin gauge theory in the IKKT model
Event Information:
Quantized comological spacetimes and higher spin gauge theory in the IKKT model
Event Location:
Hennings 318
Event Time:
Friday, August 31, 2018 | 2:00 pm - 3:00 pm
Event Location:
Hennings 309B
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2018-08-31T14:00:00
2018-08-31T15:00:00
Contextuality as a resource for measurement-based quantum computation beyond qubits
Event Information:
Contextuality—the obstruction to describing quantum mechanics in a classical statistical way—has been proposed as a resource that powers quantum computing. The measurement-based model provides a concrete manifestation of contextuality as a computational resource, as follows. If local measurements on a multi-qubit state can be used to evaluate non-linear boolean functions with only linear control processing, then this computation constitutes a proof of strong contextuality—the possible local measurement outcomes cannot all be pre-assigned. However, this connection is restricted to the special case when the local measured systems are qubits, which have unusual properties from the perspective of contextuality. A single qubit cannot allow for a proof of contextuality, unlike higher-dimensional systems, and multiple qubits can allow for state-independent contextuality with only Pauli observables, again unlike higher-dimensional generalisations. Here we identify precisely that strong non-locality is necessary in a qudit measurement-based computation that evaluates high-degree polynomial functions with only linear control.
Event Location:
Hennings 309B
Event Time:
Thursday, August 30, 2018 | 2:00 pm - 3:00 pm
Event Location:
TRIUMF Auditorium
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2018-08-30T14:00:00
2018-08-30T15:00:00
An introduction to quantum computing and resource estimation
Event Information:
The field of quantum computing has grown rapidly over the last decade. Physical systems with high double-digit numbers of qubits are expected within the coming year. As the machines continue to grow in size, they will be able to run increasingly sophisticated quantum algorithms. Some of these algorithms, such as Shor's factoring algorithm, will have serious repercussions on parts of our cryptographic infrastructure. This leads to an important question: how big of a quantum computer do we need to run an algorithm? To do so fault-tolerantly? Moreover, how long will it take?
I will begin by giving an overview of the key ideas and developments in quantum computing, as well as highlight the recent progress in physical implementations. I will then introduce ideas and techniques used for physical resource estimation of quantum algorithms. I will describe all parts of the pipeline, from the high-level algorithm description, to quantum circuit optimization, down to counting single-qubit gates and error-correcting code cycles. I will motivate the ideas using two examples studied by our research group: searching for pre-images in a cryptographic hash function, and building a quantum RAM.
Event Location:
TRIUMF Auditorium
Event Time:
Thursday, August 30, 2018 | 2:00 pm - 4:00 pm
Event Location:
Room 318, Hennings Building
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2018-08-30T14:00:00
2018-08-30T16:00:00
Departmental Oral Examination (Thesis Title: “T 1 Relaxation and Inhomogeneous Magnetization Transfer in Brain: Physics and Applications")
Event Information:
Abstract:
A major goal of the Magnetic Resonance Imaging (MRI) community is myelin quantification. MRI contrast depends on tissue microstructure, so quantitative models require good understanding of Nuclear Magnetic Resonance (NMR) physics in these complex, heterogeneous environments. In this thesis, we study the underlying physics behind two different 1 H contrast mechanisms in white and grey matter tissue: T 1 relaxation and the recently developed Inhomogeneous Magnetization Transfer (ihMT).
Using /ex-vivo /white and grey matter samples of bovine brain, we performed a comprehensive solid-state NMR study of T 1 relaxation under six diverse initial conditions. For the first time, we used lineshape fitting to quantify the non-aqueous magnetization during relaxation. A four pool model described our data well, matching with earlier studies. We also showed examples of how the observed T 1 relaxation behaviour depends upon the initial conditions.
ihMT's sensitivity to lipid bilayers like those in myelin was originally thought to rely upon hole-burning in the supposedly inhomogeneous-broadened lipid lineshape. Our work showed that this is incorrect and that ihMT only requires the presence of dipolar coupling, not a specific kind of line broadening. We developed a simple explanation of ihMT using a spin-1 system. We then performed ihMT and T 1D measurements (dipolar order relaxation time) using solid-state NMR on four samples: a multilamellar lipid system (Prolipid-161), wood, hair, and bovine tendon. ihMT was observed in all samples, even those with homogeneous broadening (wood and hair). Moreover, we saw no evidence of hole-burning.
Lastly, we present results from ihMT experiments with CPMG acquisition on the same bovine brain samples. We show that myelin water has a higher ihMT signal than water outside the myelin. It was determined that this was due to the unique thermal motion in myelin lipid. In doing so, we developed a useful metric for determining magnetization transfer's and dipolar coupling's relative contributions to ihMT. Also, we applied a four pool model with dipolar reservoirs as a qualitative model. Together, our results were consistent with myelin lipids having a uniquely long T 1D , despite recent measurements to the contrary.
Event Location:
Room 318, Hennings Building
Event Time:
Friday, August 24, 2018 | 11:00 am - 12:00 pm
Event Location:
TRIUMF Auditorium
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2018-08-24T11:00:00
2018-08-24T12:00:00
Gamma-ray lines from nuclei in cosmic sites
Event Information:
Gamma-ray lines from cosmic sources display the action of nuclear reactions in cosmic sites. The gamma rays at such characteristic energies result from nuclear transitions following radioactive decays or high-energy collisions with excitation of nuclei. The gamma-ray line and its associated special continuum from the annihilation of positrons at 511 keV falls into the same energy window, although of different origin. We present here the concepts of astronomical gamma-ray telescopes and cosmic gamma-ray spectrometry, with the corresponding instruments and missions, followed by a discussion of recent results and the challenges and open issues for the future. Among the lessons learned are the diffuse radioactive afterglow of massive-star nucleosynthesis in 26Al and 60Fe gamma rays, which is now being exploited towards the cycle of matter driven by massive stars and their supernovae.
Also, constraints on the complex processes making stars explode as either thermonuclear or core-collapse supernovae are being illuminated by gamma-ray lines, in this case from short-lived radioactivities from 56Ni and 44Ti decays. In particular, the non-sphericities that have recently been recognised as important are enlightened in different ways through such gamma-ray line spectroscopy. Finally, the distribution of positron annihilation gamma-ray emission with its puzzling bulge-dominated intensity distribution is measured through spatially-resolved spectra, which indicate that annihilation conditions may differ in different parts of our Galaxy.
Event Location:
TRIUMF Auditorium
Event Time:
Tuesday, August 21, 2018 | 2:00 pm - 3:00 pm
Event Location:
AMPEL #311
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2018-08-21T14:00:00
2018-08-21T15:00:00
Renormalization group analysis of phase transitions in the two dimensional Majorana-Hubbard model
Event Information:
A lattice of interacting Majorana modes can occur in a superconducting film on a topological insulator in a magnetic field. The phase diagram as a function of interaction strength for the square lattice was analyzed recently using a combination of mean field theory and field theory and was found to include second order phase transitions. One of these corresponds to sponta- neous breaking of an emergent U(1) symmetry, for attractive interactions.
Despite the fact that the U(1) symmetry is not exact, this transition was claimed to be in a supersymmetric universality class when time reversal symmetry is present and in the conventional XY universality class when it is absent. Another second order transition was predicted for repulsive in- teractions with time reversal symmetry to be in the same universality class as the transition occurring in the Gross-Neveu model, despite the fact that the U(1) symmetry is not exact in the Majorana model. We analyze these phase transitions using the -expansion, and show that the emergent U(1) symmetry is not broken at either critical point. We also show that for a sufficiently weak fermion mass, supersymmetry remains at the transition for attractive interactions. When the fermion mass is large, the conventional XY transition is obtained.
Event Location:
AMPEL #311
Event Time:
Friday, August 3, 2018 | 12:30 pm - 2:30 pm
Event Location:
Room 311, Brimacombe Building
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2018-08-03T12:30:00
2018-08-03T14:30:00
Final PhD Oral Examination (Thesis Title: “Experimental and Theoretical Study of The Electronic Structure of Single-crystal BaBiO3”)
Event Information:
Abstract:
Hole doped bismuth perovskite is one of the rare examples of a three-dimensional high transition temperature superconducting oxide (Tc = 34K) without a transition metal cation. The undoped compound, BaBiO3, also shows closely interlinked electronic and structural phase transitions and a controversial insulating mechanism. Understanding the electronic structure of the parent compound, BaBiO3, can give valuable insight into both its superconducting mechanism, in particular, and into the physics of the perovskites family, in general.
In this work, we first grow high-quality single crystals of BaBiO3 by congruent melting technique and characterize the crystals with x-ray diffraction, x-ray photoemission, and transport properties measurements. We then investigate the electronic structure of the material from both theoretical and experimental perspectives. Experimentally, we study the crystals through x-ray absorption, x-ray emission, and photoelectron spectroscopies. X-ray spectroscopy varies the results of density functional theory (DFT) regarding the overall band structure featuring strong O 2p character of the empty anti-bonding combination of the hybridized Bi 6s and O 2p states. We also develop a routine to successfully clean the sample's surface in order to achieve the intrinsic O 1s x-ray photoemission spectrum.
Finally, we employ the "exact diagonalization single cluster configuration interaction" method to investigate the ground state electronic structure of the material and to understand the measured O 1s x-ray photoemission result. From the analysis of the core level line shapes, we conclude that the dominant O 2p-Bi 6s hybridization energy scale determines the low energy scale electronic structure. We also nd that for a wide range of electronic parameters, the holes reside primarily on the ligand oxygen anions rather than the bismuth cation consistent with the band structure calculation but contrary to what is traditionally assumed for this material. This analysis provides further insight into the importance of self-doped oxygen 2p states in this high Tc family of oxides.
Event Location:
Room 311, Brimacombe Building
Event Time:
Thursday, August 2, 2018 | 11:00 am - 12:00 pm
Event Location:
Brimacombe 311
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2018-08-02T11:00:00
2018-08-02T12:00:00
Unusual Magnetic Behaviors involving Large Spin-Orbit Coupling
Event Information:
Large spin-orbit coupling makes the magnetic eigenstate of the total angular momentum state with an admixed spin state and induces unusual magnetic behaviors. In cooperation with the crystal field, it could introduce the Kramers doublet in the magnetic ion site. Then the magnetism is described with the so-called spin-orbit coupled isospin 1/2, and the system often displays novel quantum magnetism behaviors. On the other hand, the admixed spin states possibly introduce anisotropic spin-spin interactions involving the inter-site hopping. In this talk, I will discuss recent results of spin-orbit coupled isospin quantum magnetism in a geometrical frustrated pyrochlore Ba3Yb2Zn5O11 and a layered Kitaev lattice α-RuCl3. If time is available, I will also briefly discuss giant magnetic anisotropy observed in layered Cr compounds, which has been puzzled for the Cr3+ (t2g3) magnetic ion with L = 0.
Event Location:
Brimacombe 311
Event Time:
Thursday, June 21, 2018 | 2:00 pm - 9:00 pm
Event Location:
TRIUMF Auditorium
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2018-06-21T14:00:00
2018-06-21T21:00:00
Chirality in nuclei: new achievements and perspectives
Event Information:
The breaking of symmetries in quantum systems is one of the key issues in nuclear physics. In particular, the spontaneous symmetry breaking in rotating nuclei leads to exotic collective modes, like the wobbling and chiral motions, which are unique fingerprints of triaxiality in nuclei and have been intensively studied in recent years. We are currently involved in the study of Lanthanide nuclei, in which several bands have been identified recently and interpreted as the manifestation of a stable triaxial nuclear shape, presenting various types of collective motion, like tilted axis and principal axis rotation, wobbling and chiral motion. Chiral bands in even-even nuclei, which were taught to be unfavored energetically, unstable against 3D rotation and difficult to observe, have been instead identified very recently in 136Nd. The experimental evidence of such bands will be presented and their theoretical interpretation will be discussed. The experimental evidence of multiple chiral bands in several Lanthanides, as well as the presence of competing collective oblate rotation up to very high spins in Nd nuclei will also be discussed.
Event Location:
TRIUMF Auditorium
Event Time:
Thursday, May 17, 2018 | 4:00 pm
Event Location:
AMPL 311
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2018-05-17T16:00:00
The interaction of magnetism and superconductivity, and the development of superconducting spintronics
Event Information:
The discovery in 2010, using superconductor / ferromagnet / superconductor Josephson junctions, that it is possible to controllably create triplet Cooper pairs in which the electrons have parallel spins created the field of superconducting spin electronics (superspintronics) [1]. However, even if triplet pairing implies that supercurrents can carry spin, this is not in itself sufficient to create functioning superspintronic devices. In parallel, a variety of other interactions between singlet superconductivity and magnetism have been actively explored. This talk will cover the key developments in superconducting spintronics that have taken place since the first demonstrations of triplet pairing, including the demonstration of spin filter Josephson junctions [2], superconducting exchange coupling [3] and superconducting spin valve memory devices [4].
[1] J. W. A. Robinson, J. D. S. Witt, and M. G. Blamire, "Controlled Injection of Spin-Triplet Supercurrents into a Strong Ferromagnet", Science 329, 59 (2010).
[2] K. Senapati, M. G. Blamire, and Z. H. Barber, "Spin-filter Josephson junctions", Nature Mater. 10, 849 (2011).
[3] Y. Zhu, A. Pal, M. G. Blamire, and Z. H. Barber, "Superconducting Exchange Coupling between Ferromagnets", Nature Mater. 16, 195 (2017).
[4] Y. Gu, G. B. Halász, J. W. A. Robinson, and M. G. Blamire, "Large superconducting spin valve effect and ultra-small exchange-splitting in epitaxial rare-earth-niobium trilayers", Phys. Rev. Lett. 115, 067201 (2015).
Event Location:
AMPL 311
Event Time:
Thursday, May 17, 2018 | 2:00 pm
Event Location:
TRIUMF Auditorium
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2018-05-17T14:00:00
Project 8: A frequency-based approach to measure the absolute neutrino mass scale
Event Information:
Neutrino flavor oscillation experiments prove that neutrinos do have nonzero masses. Extensions to the Standard Model of Particle Physics have been developed to explain the non-zero masses and can be directly tested by a measurement of the absolute neutrino mass scale. The mass of the electron antineutrino can be determined from the highest precision measurement of the beta-decay spectrum of tritium around its endpoint region (Q = 18.6 keV). The current state of the art experiment stretches all technological limits to probe the range of the electron antineutrino mass down to 200meV. A completely new path has to be envisioned to test the full range of electron neutrino masses allowed in the inverted neutrino mass ordering scheme. The Project 8 collaboration has recently demonstrated the novel technique of Cyclotron Radiation Emission Spectroscopy (CRES) to pursue a frequency-based measurement approach. I will present this new approach and results obtained with mono-energetic conversion electrons from 83m^Kr. The phased program towards a measurement using atomic tritium with a mass sensitivity potentially below 40meV will be discussed as well as the application of CRES to high energy beta-decays in searches for exotic, tensor-like interactions.
Financial support by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics to the University of Washington under Award Number DE-FG02-97ER41020 is acknowledged.
Event Location:
TRIUMF Auditorium
Event Time:
Saturday, May 12, 2018 | 10:00 am
Event Location:
See event website
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2018-05-12T10:00:00
Science Rendezvous at UBC
Event Information:
Join us for The University of British Columbia’s 2018 Science Rendezvous festival. Science Rendezvous is an annual festival held across Canada showcasing the Art in Science. This year’s theme is “Full S.T.E.A.M. Ahead!” and will emphasize science, technology, engineering, art, and math (STEAM) research and innovation.
On Saturday May 12 (10 AM – 2 PM) race across the University to complete our Science Chase! From the Old Barn Community Centre to the Department of Chemistry, intrepid visitors will race across campus and experience the power of STEAM! Take a ride on a hovercraft, discover micro-organisms in the pond, explore quantum physics, and learn how fire, ash, and magma made the Earth we walk on today. Make it through all the explosions, workshops, and hands-on experiments to emerge a science victor!
The event, which has activities across UBC campus, is free for everyone. Join us on May 12th to win cool prizes, tour UBC, and of course, learn about all the amazing feats of science and engineering happening right here at home! Check out our website (http://www.sciencerendezvous.ca/event_sites/ubc/) for more event information and a map with all our fun activities.
TRIUMF will also be celebrating its 50th anniversary by hosting several demonstration next to UBC campus and at Science World. From following the path of a tiny proton to the creation of the universe, be sure to follow their events from May 9th - 18th. Make sure to sign up using the links below! Unveiling the Universe Presentation (May 9th 6 - 8PM): https://www.triumf50.com/celebrate Public Tours (May 7th - 18th, Tuesday & Thursday 10am & 2pm - Weds 1pm): http://www.triumf.ca/public-tours
Event Location:
See event website
Event Time:
Monday, May 7, 2018 | 2:00 pm
Event Location:
TRIUMF Auditorium
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2018-05-07T14:00:00
The 10ps TOFPET Challenge, Myth or Reality
Event Information:
The future generation of radiation detectors is more and more demanding on timing performance for a wide range of applications, such as time of flight (TOF) techniques for PET cameras and particle identification in nuclear physics and high energy physics detectors, precise event time tagging in high luminosity accelerators and a number of photonic applications based on single photon detection. A target of 10ps coincidence time resolution in TOFPET scanners would introduce a paradigm shift in PET imaging. Besides resulting in on-line image formation, the localisation of annihilation events directly from their TOF provides ultimate use of the dose delivered to the patient to get the best Signal to Noise Ratio into the resulting image and offers a potential reduction of the scan duration and a direct access to the image during the scan itself. Reconstructionless TOF-PET also reduces efficiently undesired effects inherent to the PET detection, namely randoms and scatters when appropriately correlated to energy discrimination, hence contributing to reduce dose, scan duration and possibly scan cost while using very short-lived positron emitting isotopes.
The time resolution of a scintillator-based detector is directly driven by the density of photoelectrons generated in the photodetector at the detection threshold. At the scintillator level it is related to the intrinsic light yield, the pulse shape (rise time and decay time) and the light transport from the gamma-ray conversion point to the photodetector. When aiming at 10ps time resolution fluctuations in the thermalization and relaxation time of hot electrons and holes generated by the interaction of ionization radiation with the crystal become important. This talk will review the different processes at work and evaluate if some of the transient phenomena taking place during the fast thermalization phase can be exploited to extract a time tag with a precision in the few ps range. Some considerations will also be given on the possibility to exploit quantum confinement for the production of ultrafast spontaneous or stimulated emission in semi-conductors.
The light transport in the crystal is also an important source of time jitter. In particular light bouncing within the scintillator must be reduced as much as possible as it spreads the arrival time of photons on the photodetector and strongly reduces the light output by increasing the effect of light absorption within the crystal. A possible solution to overcome these problems is to improve the light extraction efficiency at the first hit of the photons on the crystal/photodetector coupling face by means of photonic crystals (PhCs) specifically designed to couple light propagation modes inside and outside the crystal at the limit of the total reflection angle.
Finally the present limitations of the photodetectors, and in particular the SiPMs will be discussed and some R&D lines to meet the 10ps challenge will be presented.
Event Location:
TRIUMF Auditorium
Event Time:
Thursday, May 3, 2018 | 2:00 pm
Event Location:
TRIUMF Auditorium
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2018-05-03T14:00:00
The astrophysical r-process: What we are learning from gravitational waves, dwarf galaxies, and stellar archaeology
Event Information:
Understanding the origin of the elements is one of the major challenges of modern astrophysics. The rapid neutron-capture process, or r-process, is one of the fundamental ways that stars produce the elements listed along the bottom 2/3 of the periodic table, but key aspects of the r-process are still poorly understood. I will describe three major advances in the last few years that have succeeded in confirming neutron star mergers as an important site of the r-process. These include the detection of freshly produced r-process material powering the kilonova associated with the merger of neutron stars detected via gravitational waves (GW170817), the detection of a dwarf galaxy where most of the stars are highly enhanced in r-process elements (Reticulum II), and advances in deriving abundances of previously-undetected r-process elements (Se, Te, Pt) in ultraviolet and optical spectra of metal-poor stars in the Milky Way halo field. I will describe future prospects that connect these three research directions and future rare isotope accelerators to associate specific physics with specific sites of the r-process.
Event Location:
TRIUMF Auditorium
Event Time:
Thursday, April 26, 2018 | 8:30 am
Event Location:
Room 1221, Forest Sciences Building
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2018-04-26T08:30:00
30 Years of AKLT - Interacting Systems in Low Dimensions
Event Information:
The Stewart Blusson Quantum Matter Institute is pleased to invite you to attend the workshop: 30 years of AKLT: Interacting Systems in Low Dimensions
INTERNATIONAL SYMPOSIUM CELEBRATING 30 YEARS OF THE AFFLECK-KENNEDY-LIEB-TASAKI PARADIGM
Invited Speakers
Ian Affleck (Vancouver) "Majorana-Hubbard model in two dimensions"
Mohammad Amin (d-Wave)"Observation of topological order in a programmable superconducting quantum processor"
Collin Broholm (Baltimore) "The Quest for a Quantum Spin Liquid"
John Cardy (Berkeley) "The TTbar deformation of quantum field theory and some applications"
Jean-Sebastien Caux (Amsterdam) "Wires and chains: the dance of field theory and integrability"
Claudio Chamon (Boston) "Non-Abelian topological phases in three spatial dimensions from coupled wires"
Sebastian Eggert (Kaiserslautern) "The dynamic structure factor in impurity-doped spin-1/2 chains"
Ion Garate (Sherbrooke) "Efficient algorithm for real-space parameter optimization in Majorana wires"
Domenico Giuliano (Calabria) "Effects of a Majorana mode at a junction between a topological superconductor and quantum nanowires"
Masayuki Hagiwara (Osaka) "Experimental verification of AKLT model and Affleck-Haldane conjecture for spin-1 1D antiferromagnets"
Bertrand Halperin (Harvard) "Particle-Hole Symmetry in a Half-Filled Landau Level"
Catherine Kallin (McMaster) "The Anomalous Hall Effect in Chiral Superconductors"
Brad Marston (KITP/Brown) "El Niño as a Topological Insulator: A Surprising Connection Between Climate, and Quantum Physics"
Frederic Mila (Lausanne) "Generalization of the Haldane conjecture to SU(3) chains"
Masaki Oshikawa (Tokyo) "AKLT and beyond: Ian Affleck's contributions to 1D quantum many- body physics"
Rodrigo Pereira (Natal) "Chiral fixed point and three-channel Kondo effect in Y junctions of Heisenberg spin chains"
Dmitry Pikulin (Santa Barbara) "Charging energy of a Majorana Cooper pair box"
Nathan Seiberg (Princeton) "QED3"
Eran Sela (Tel Aviv) "Can one simultaneously measure entanglement and charge of many body systems?"
Pascal Simon (Paris) "Exploring a quantum phase transition with a Kondo circuit"
Jesko Sirker (Manitoba) "Transport in integrable lattice models"
Erik Sorensen (McMaster) "Dynamics and Critical Scaling at the Superconductor to Insulator Transition"
Hal Tasaki (Gakushuin) "Two extensions of the Lieb-Schultz-Mattis theorem for spin chains"
Steven White (Irvine) "Critical behaviour in hydrogen chains from electronic structure calculations"
Event Location:
Room 1221, Forest Sciences Building
Event Time:
Wednesday, April 25, 2018 | 12:30 pm
Event Location:
Room 309, Hennings Building
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2018-04-25T12:30:00
Departmental Oral Examination (Thesis Title: "Measurement of the Arterial Input Function from Radial MR Projections")
Event Information:
The accuracy of Pharmacokinetic model fit parameters is highly sensitive to the quality of the contrast-time curves acquired in the tissue of interest and within a blood vessel feeding the tissue. The later curve is commonly referred to as the arterial input function (AIF). It is difficult to measure the AIF in pre-clinical studies in mice due to their small body size and limited number of vessels of a sufficient size. As a result, several groups will use a population averaged curve from the literature. This curve does not account for inter or intra individual differences, and impacts the accuracy of the fit parameters.
We propose a new projection-based measurement that measures the AIF from a single trajectory in k-space and having a temporal resolution equal to the repetition time (TR). This AIF is measured in the mouse tail due to the simpler geometry void of highly enhancing organs nearby. The projection-based AIF is advantageous as it allows for the acquisition of DCE data, in the tissue of interest, between measurements without affecting the temporal resolution of either data set. We set up a dual coil experiment platform that acquires AIF data at the mouse tail and DCE data at the tumour. The dual coil approach allows us to maximize the quality of the data at both locations, while achieving the desired high temporal resolution.
Event Location:
Room 309, Hennings Building
Event Time:
Tuesday, April 24, 2018 | 1:00 pm
Event Location:
Room 309, Hennings Building
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2018-04-24T13:00:00
Departmental Oral Examination (Thesis Title: “Searches for heavy vector-like quarks decaying to high transverse momentum W bosons and top- or bottom-quarks and weak mode identification with the ATLAS detector")
Event Location:
Room 309, Hennings Building