Condensed Matter Seminars

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.

Phase lapses and dephasing in quantum Hall interferometers

Speaker: 
Yehuda Dinaii, Weizmann Institute
Event Date and Time: 
Thu, 2014-12-04 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Marcel Franz
Intended Audience: 
Graduate

In this talk I will discuss the phenomena of dephasing and phase lapses as they occur in two setups operating in the quantum Hall regime. Both setups consist of a quantum dot and an electronic Mach-Zehnder interferometer. Dephasing, i.e. loss of coherent transport, and phases lapses, i.e. abrupt jumps in the phase of the transmission amplitude, turn out to be intimately related in these setups. In the first setup, transport through a chiral channel is affected by charge fluctuations in a nearby quantum dot.

Extraordinary Acoustic Raman (EAR): Listening in on Nanoparticle Vibrations

Speaker: 
Reuven Gordon, University of Victoria
Event Date and Time: 
Thu, 2014-11-20 14:00 - 15:00
Location: 
AMPEL 311
Local Contact: 
Jeff Young
Intended Audience: 
Graduate

Colloidal quantum dots, viruses, DNA and all other nanoparticles have acoustic vibrations that can act as ‘fingerprints’ to identify their shape, size and mechanical properties, yet high-resolution Raman spectroscopy in this low-energy range has been lacking. Here, we introduce extraordinary acoustic Raman (EAR) spectroscopy, a new technique to measure the Raman-active vibrations of single isolated nanoparticles in the 0.1–10 wavenumber range with ∼0.05 wavenumber resolution.

Thermal and electrical transport in the heavy fermion compound YbRh2Si2 under magnetic fields

Speaker: 
Heike Pfau, Max Planck Institute for Chemical Physics of Solids, Dresden
Event Date and Time: 
Thu, 2014-11-13 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Andrea Damascelli
Intended Audience: 
Graduate

The Kondo effect couples a local magnetic moment with conduction electrons to a composite heavy quasiparticle leading to a non-magnetic ground state. At the same time, a coupling between the moments favors a magnetically ordered state. An applied magnetic field influences the ground state and the nature of the heavy quasiparticles in two ways: On one side, it can tune the competition between the Kondo interaction and the magnetic exchange leading to a quantum critical point (QCP).

Syndicate content
Website development by Checkmark Media. Designed by Armada.

a place of mind, The University of British Columbia

Faculty of Science
Department of Physics and Astronomy
6224 Agricultural Road
Vancouver, BC V6T 1Z1
Tel 604.822.3853
Fax 604.822.5324

Emergency Procedures | Accessibility | Contact UBC | © Copyright The University of British Columbia