Condensed Matter Seminars

Layer-by-layer entangled spin-orbital texture of the topological surface state in Bi2Se3

Speaker: 
Jason Zhu (UBC)
Event Date and Time: 
Thu, 2013-02-07 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

With their spin-helical metallic surface state, topological insulators (TIs) define a new class of materials with strong application potential in spintronics. Technological exploitation depends on the degree of spin polarization of the topological surface state (TSS), assumed to be 100% in phenomenological models. Yet in Bi2Se3, an archetypical TI material, spin- and angle-resolved photoemission spectroscopy (S-ARPES) detects a spin polarization ranging from 20 to 85%, a striking discrepancy which undermines the applicability of real TIs.

Chasing the nematic phase in Ba(Fe1−xCox)2As2 with optical investigations

Speaker: 
L. Degiorgi (ETH)
Event Date and Time: 
Thu, 2013-06-13 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

 

Ultrafast Mid-infrared Spectroscopy of Charge- and Spin-Ordered Nickelates

Speaker: 
Giacomo Coslovich (UC Berkeley)
Event Date and Time: 
Thu, 2013-04-11 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Andrea Damascelli
Intended Audience: 
Graduate

 

Effects of disordered substitutions and vacancies in Fe based superconductors from first principles

Speaker: 
Tom Berlijn, Brookhaven National Lab and University of Florida
Event Date and Time: 
Mon, 2013-01-28 13:30 - 14:30
Location: 
Hennings 318
Local Contact: 
Maria Pylaeva
Intended Audience: 
Graduate

 

Novel Phases in Mott-insulating iridates

Speaker: 
Yogesh Singh
Event Date and Time: 
Thu, 2013-03-14 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Andrea Damascelli
Intended Audience: 
Graduate

In this talk we will present results of our studies on two families of iridates. The honey-comb lattice iridates A2IrO3 (A = Na, Li) and the hyper-kagome material Na4Ir3O8. The A2IrO3 materials are novel spin-orbit driven Mott-insulators which show magnetic behaviors that are consistent with the Kitaev-Heisenberg model with the Li system situated closer to the Kitaev limit.

Superconducting ruthenates and cuprates synthesized by molecular beam epitaxy and pulsed laser ablation

Speaker: 
Yoshiharu Krockenberger
Event Date and Time: 
Thu, 2013-02-21 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

 

Superconducting Nanowire Single Photon Detectors

Speaker: 
Mohsen K. Akhlaghi, UBC (work done while at IQC and the University of Waterloo)
Event Date and Time: 
Thu, 2013-01-17 14:00 - 15:00
Location: 
Hennings 319
Intended Audience: 
Graduate

 

Entering the world of spin-orbit-coupled Iridates using Resonant Inelastic X-Ray Scattering

Speaker: 
Hlynur Gretarsson – University of Toronto, Department of Physics
Event Date and Time: 
Thu, 2013-01-10 14:00 - 15:00
Location: 
Hennngs 318
Local Contact: 
Maria Pylaeva
Intended Audience: 
Graduate

Iridates have attracted enormous recent interest from the condensed matter physics community. This is due to the fact that the large spin-orbit coupling (0.4-0.5 eV) that exists in Ir (5d element), can alter the electronic properties of a material from a metallic to a Mott insulator with an exotic magnetic behaviour described by both spin and orbital components (Jeff=1/2 state).

The metal-insulator transition in VO2: the triple point and photoresponse

Speaker: 
David H. Cobden, Department of Physics, University of Washington
Event Date and Time: 
Thu, 2012-11-22 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

First-order solid-state phase transitions are frustrating to study in macroscopic crystals and films due to domain frustration (sorry). By working with crystals smaller than the characteristic domain size one can obtain much more precise control and measurements of such transitions. With this in mind we are performing a range of studies of the metal-insulator transition in vanadium dioxide single-crystal nanobeams and micron-scale plates.

Optical Probing of Novel 2D Electronic Systems

Speaker: 
Xiaodong Xu
Event Date and Time: 
Thu, 2012-11-29 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

 

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