Condensed Matter Seminars

Physics and Chemistry at the Single-Molecule Level

Speaker: 
Latha Venkataraman, Department of Applied Physics and Department of Chemistry, Columbia University
Event Date and Time: 
Thu, 2015-03-19 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Sarah Burke
Intended Audience: 
Graduate

 

The Search for Exotic Physics in the Noncentrosymmetric Superconductor BiPd

Speaker: 
Darren Peets, Seoul National University
Event Date and Time: 
Thu, 2015-03-12 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Doug Bonn
Intended Audience: 
Graduate

In noncentrosymmetric superconductors, materials which lack an inversion centre in their crystal structure, parity is no longer a useful concept and singlet and triplet pairing states are no longer eigenfunctions. Since our conventional understanding of superc

Quantum spin Hall effect subject to magnetic field as a quantum Hall bilayer

Speaker: 
Dmitry Pikulin, University of British Columbia
Event Date and Time: 
Thu, 2015-02-26 14:00 - 15:00
Location: 
Hennings 319
Local Contact: 
Ian Affleck, or contact Dmitry directly
Intended Audience: 
Graduate

Quantum spin Hall insulator is a recently observed 2d topological insulator, which is protected by time-reversal symmetry. We theoretically study its properties in a strong perpendicular magnetic field. With increasing field the system undergoes a series of transitions between correlated and uncorrelated insulator phases. We argue that the correlated phase can be understood as a quantum Hall bilayer with a twist.

Many-body localization and potential realizations in cold atomic gases

Speaker: 
Jesko Sirker, University of Manitoba
Event Date and Time: 
Thu, 2015-04-02 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Ian Affleck
Intended Audience: 
Graduate

Disorder in a non-interacting quantum system can lead to Anderson localization where single-particle wave functions become localized in some region of space.

Amorphous Mixed-Metal Oxides Tailored for Water Oxidation Catalysis

Speaker: 
Curtis Berlinguette, Department of Chemistry and Department of Chemical & Biological Engineering UBC
Event Date and Time: 
Thu, 2015-02-12 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Sarah Burke
Intended Audience: 
Graduate

The conversion of water into hydrogen fuel is a promising scheme for the large-scale storage of solar electricity, but the efficiency of the conversion process suffers from substantial overpotentials.   The development of efficient oxygen evolution reaction (OER) catalysts is needed to more easily co

Screening Cloud and Majorana Fermions

Speaker: 
Domenico Giuliano, U. Callabria, Italy
Event Date and Time: 
Thu, 2015-01-22 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Ian Affleck
Intended Audience: 
Graduate

While much theoretical evidence has accumulated for the idea of a "Kondo Screening Cloud" of itinerant electrons surrounding an isolated magnetic impurity in a conducting medium, which is typically associated to the emergence of a Kondo screening length as a r

Spin ice: at the dawn of a new day?

Speaker: 
Michel Gingras, Department of Physics & Astronomy, University of Waterloo
Event Date and Time: 
Thu, 2015-01-29 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Marcel Franz
Intended Audience: 
Graduate

Spin ices are frustrated ferromagnetic systems which are fascinating for the many aspects of statistical mechanics that they embody.

Novel Josephson effect in triplet Josephson junctions: The story begins

Speaker: 
Dirk Manske, Max Planck Institute for Solid State Research
Event Date and Time: 
Thu, 2015-01-15 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

Josephson junctions with magnetic tunneling barriers provide an excellent opportunity to observe the interplay of ferromagnetism and superconductivity in a controlled setting.

Specific heat of underdoped cuprate superconductors in high magnetic fields

Speaker: 
Jonathon Kemper, National High Magnetic Field Laboratory, University of Florida
Event Date and Time: 
Mon, 2014-12-01 12:00 - 13:00
Location: 
AMPEL 311
Local Contact: 
Andrea Damascelli
Intended Audience: 
Graduate
I will discuss specific heat measurements on three families of hole-doped cuprate superconductors, including YBa2Cu3O6+x where x=0.43, 0.47,0.51 and 0.67, aimed at tracking the low energy electronic density of states as a function of magnetic field in both the superconducting and resistive state. The underlying goal is one of understanding how superconducting state at zero field evolves into one with strong Fermi liquid signatures in the high field resistive state, such as quantum magneto-oscillations.

Emergent SU(4) Kondo physics in a spin-charge-entangled double quantum dot

Speaker: 
Andrew Keller, Stanford University
Event Date and Time: 
Fri, 2014-12-05 10:00 - 11:00
Location: 
Hennings 318
Local Contact: 
Maria Pylaeva
Intended Audience: 
Graduate

Quantum impurity models, which describe how a local degree of freedom interacts with a continuum, are central to condensed-matter physics. Such models may be naturally implemented with quantum dots coupled to each other and to metallic leads. Here we detail a many-body Kondo state occurring when two quantum dots are coupled electrostatically. We use orbital state-resolved bias spectroscopy to demonstrate the entanglement of spin and charge between spatially separated orbitals of the Kondo state.

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