PIRSA:C12026 - 4 Corner Southwest Ontario Condensed Matter Physics Symposium 2012PODCAST Subscribe to podcast

4 Corner Southwest Ontario Condensed Matter Physics Symposium 2012


Collection URL: http://pirsa.org/C12026

PIRSA:12050034  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Quantum Spin Liquids: Life After the Drought
Speaker(s): Patrick Lee
Abstract: The quantum spin liquid state is a prime example of an emergent phenomenon. Theory predicts that new particles such as spinons and gauge fields may emerge at low temperatures. However, for many years there have not been any examples in nature. The situation has changed in recent years in th... read more
Date: 03/05/2012 - 10:00 am

PIRSA:12050035  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Effective Spin-1/2 Hamiltonians Determined for Er2Ti2O7 & Yb2Ti2O7 Through Inelastic Neutron Scattering
Speaker(s): Kate Ross
Abstract: We used time-of-flight inelastic neutron scattering to measure the excitation spectra from field-polarized states of exotic frustrated magnets. A knowledge of these spin-wave excitations in various directions in reciprocal space allows a robust determination of exchange parameters in suitab... read more
Date: 03/05/2012 - 11:00 am

PIRSA:12050036  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Chiral Mott Insulator of Bosons in a Fully Frustrated Bose Hubbard Model
Speaker(s): Arun Paramekanti
Abstract: Recent experiments have demonstrated that it is possible to create a synthetic magnetic field for neutral atoms in optical lattices using two-photon (Raman) processes. Motivated by exploring the interplay of such artificial magnetic fields and strong correlations for bosons, we have studied the Bose... read more
Date: 03/05/2012 - 11:30 am

PIRSA:12050037  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Classical Wigner Crystals on Flat and Curved Surfaces, Topological Defects, `Pleats ‘ and Particle Fractionalization
Speaker(s): Paul Chaikin
Abstract: Charged colloidal particles present a controllable system for study a host of condensed matter/many body problems such as crystallization. 2D crystals are invariably hexagonal. Hexagons perfectly tile a flat plane but a soccer ball requires exactly 12 pentagons dispersed among the hexagons on its cu... read more
Date: 03/05/2012 - 1:30 pm

PIRSA:12050038  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Molecular rotation in doped superfluid clusters
Abstract: Experiments where impurities were incorporated into helium nanodroplets have shown that the impurity freely rotates, and this has been attributed to the superfluidity of the nanodroplet [1]. Results from experiments with smaller helium clusters suggest that the onset of superfluidity is linked to sy... read more
Date: 03/05/2012 - 2:30 pm

PIRSA:12050039  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Spin liquid and Deconfined Criticality in a Kagome Lattice Bose-Hubbard Model
Speaker(s): Roger Melko
Abstract: We present large-scale quantum Monte Carlo simulations on a sign-problem free Bose-Hubbard model on the kagome lattice. This model supports a quantum Z2 spin liquid phase with fractional excitations and topological order, which can be characterized definitively through calculation of the topological... read more
Date: 03/05/2012 - 3:00 pm

PIRSA:12050040  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Intrinsic, Anomalous Hall Effect in a Chiral Multiband Superconductor
Speaker(s): Edward Taylor
Abstract: Chiral superconducting states have attracted an enormous amount of interest in recent years, due both to their intrinsic novelty as well as their potential for quantum information processing. They break both parity and time-reversal sym-metries and have been predicted to harbour Majorana fermions in... read more
Date: 03/05/2012 - 4:00 pm

PIRSA:12050041  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Far Infrared Study of Magnetic Field Induced Normal States of La1.94Sr0.06CuO4
Speaker(s): Tom Timusk
Abstract: We report on the ab-plane optical properties of the magnetic field inducednormal state of underdoped La1.94Sr0.06CuO4  (Tc=5.5 K), the first such study. We apply strong magnetic fields (4 T and 16 T) along the c-axis. We find that a 4 T field is strong enough to destroy the superconducting ... read more
Date: 03/05/2012 - 4:30 pm

PIRSA:12050042  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Fractionalized Topological Insulators in Frustrated Magnets
Abstract: Spin liquid phases in frustrated magnets may arise in a variety of forms. Here we discuss the possibility of topological insulators of spinons or the fractionalized excitations in spin liquids. These phases should be characterized by "both" of the two popular and different definitions of topological... read more
Date: 03/05/2012 - 5:00 pm
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