Condensed Matter Seminars

Magnetic moments in graphene: experimental and theoretical viewpoints

Speaker: 
Mark Lundeberg and Hamed Karimi
Event Date and Time: 
Thu, 2012-09-27 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

From the organizer: This seminar is made up of two talks, the first of which presents a puzzle from experiment, and the second of which offers a possible theoretical answer.

--------------------

Why does coherence saturate in graphene at low temperature? (Mark Lundeberg)

Sr2RuO4, a spin-orbit entangled superconductor

Speaker: 
Maurits Haverkort
Event Date and Time: 
Thu, 2012-10-25 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

Sr2RuO4 stands out even amongst the unconventional superconductors. The relativistic spin orbit interaction causes a momentum dependent entanglement of orbital and spin quantum numbers. Using circularly polarised light combined with spin and angle resolved photoemission spectroscopy, we directly observe this entanglement in good agreement with relativistic band-structure calculations. The presence of spin-orbit entangled states inherently has a profound influence on the description of the superconducting state.

How to kill a topological insulator

Speaker: 
N. Peter Armitage
Event Date and Time: 
Thu, 2012-10-11 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

Topological insulators (TIs) are newly discovered states of matter characterized by an “inverted” band structure driven by strong spin-orbit coupling. One of their most touted properties is the existence of robust "topologically protected" surface states.   I will discuss what topological protection means for transport experiments and how it can be probed using the technique of time-domain THz spectroscopy applied to thin films of Bi2Se3.

Non-equilibrium dynamics in one-dimensional quantum models

Speaker: 
Jesko Sirker
Event Date and Time: 
Thu, 2012-09-13 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

I will discuss general properties of non-equilibrium dynamics in quantum models focussing, in particular, on the question of thermalization in closed systems. As examples, I will consider quench dynamics in a one-dimensional fermionic Hubbard model as well as a toy model for the injection of particles into an empty chain.

Phasing Out the Greenhouse Gas Fridge

Speaker: 
Karl G. Sandeman Physics, Imperial College, London
Event Date and Time: 
Mon, 2012-05-14 13:00 - 14:00
Location: 
Henning 318
Local Contact: 
Walter Hardy
Intended Audience: 
Graduate

The fundamental understanding of solid-state phase transitions is crucial to technological innovation. To the most well-known phase transition technologies – colossal magnetoresistance, shape memory, phase change memory, and thermochromic coatings – we need to add magnetic cooling. In the last ten years, research on magnetic phase changes at room temperature has exploded as materials physicists have been drawn to the problem of developing efficient solid-state gas-free refrigeration [1].

Circuit Quantum Electrodynamics with a Spin-Orbit Qubit

Speaker: 
Jason Petta
Event Date and Time: 
Mon, 2012-05-07 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

Circuit quantum electrodynamics studies the interactions between the microwave field of a cavity and an artificial atom. We develop a circuit quantum electrodynamics architecture for spin qubits by coupling an InAs nanowire double quantum dot to a high quality factor superconducting cavity. A charge trapped in the double quantum dot interacts with the electric field of the cavity, resulting in a large vacuum Rabi frequency of ~ 35 MHz.

Intrinsic, anomalous Hall effect in a chiral multiorbital superconductor

Speaker: 
Edward Taylor (McMaster University)
Event Date and Time: 
Wed, 2012-05-09 13:00 - 14:00
Location: 
Henn 318
Local Contact: 
Jean-Sébastien Bernier
Intended Audience: 
Graduate

 

Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices

Speaker: 
Sergey Frolov
Event Date and Time: 
Thu, 2012-04-19 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

Majorana fermions are particles identical to their own antiparticles, first introduced by Majorana as hypothetical elementary particles. Subsequently they were predicted in topological superconductors as quasiparticles of zero energy and zero charge. We have implemented a recipe for Majoranas that has four simple ingredients: 1) one-dimensional wires 2) spin-orbit interaction 3) superconductivity and 4) magnetic field. I will present electrical measurements on nanowires grown from indium antimonide, a material with strong spin-orbit interaction.

Signatures of Majorana Fermions in Hybrid Superconductor-Topological Insulator Devices

Speaker: 
James Williams
Event Date and Time: 
Wed, 2012-03-28 14:00 - 15:15
Location: 
AMPEL 311
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

 

Isotropic Landau Levels of Relativistic and Non-Relativistic Fermions in 3D Flat Space

Speaker: 
Congjun Wu -- University of California, San Diego
Event Date and Time: 
Mon, 2012-03-19 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Jean-Sébastien
Intended Audience: 
Graduate


The study of topological electron states started with the 2D quantum Hall effect in the external magnetic fields which arises from the Landau level quantization of the cyclotron motion of electrons. However, the usual LLs crucially relies on the planar structure, and it is not obvious to identify its 3D counterpart. On the other hand, the current study of 3D topological insulators is largely confined to lattice systems with Bloch-wave bands.

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