Condensed Matter Seminars

Understanding the role of correlations in 5d transition metal oxides - an ARPES overview of Na2IrO3

Speaker: 
Riccardo Comin
Event Date and Time: 
Thu, 2012-10-04 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

5d-based transition metal oxides represent a novel class of materials which attracted a growing interest in the last decade for giving rise to unconventional states of matter. In particular, a few members from the family of iridates, so far the most investigated, have been proposed to be the realization of an unconventional spin-orbit assisted Mott-Hubbard physics. To test this proposal, we have studied the newest addition to the iridate family, sodium iridate (Na2IrO3), by ARPES, optics, and band structure calculations in the local-density approximation (LDA).

2D Chalcogenide Nanostructures – From Topological Insulators to Plasmonic Metamaterials

Speaker: 
Judy Cha
Event Date and Time: 
Thu, 2012-11-01 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

Two-dimensional (2D) layered metal chalcogenides exhibit a broad range of electronic properties.  They can be poor metals, narrow-gap semiconductors, and the recently discovered topological insulators (TIs).  TIs, in particular, have garnered intense interests due to their exotic surface states that are robust against time reversal perturbations and exhibit unique spin-momentum locking property.  These surface properties can be greatly enhanced by making chalcogenides into nanostructures.

PbSe Quantum Oscillators and Silicon Planar Photonic Circuits in Resonance at 1.5 um

Speaker: 
Jeff Young
Event Date and Time: 
Thu, 2012-11-15 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

The talk will illustrate recent advances in silicon photonic circuit technology that suggest it will become a powerful platform for many future technologies, including quantum information.  Our group’s efforts to couple the threshold excitonic transition in 5 nm diameter PbSequantum dots to 1.5 um photons propagating in silicon photonic circuits will be reviewed, with emphasis on understanding the electronic and optical properties of colloidal PbSe nanocrystals on silicon surfaces

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

 

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