Condensed Matter Seminars

Interplay of spin-orbit effects and electron delocalization in honeycomb iridates

Speaker: 
Kateryna Foyevstova
Event Date and Time: 
Thu, 2014-01-30 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

Strong relativistic spin-orbit coupling in iridium oxides gives rise to new interesting physical effects, such as spin-orbit coupling induced Mott insulating state and anisotropic spin exchange. In honeycomb iridates, e.g., Na2IrO3, the peculiar topology of the Ir lattice introduces additional complexity. Recently, it has been proposed that Na2IrO3 might be a realization of the exotic Heisenberg-Kitaev spin model featuring a rich variety of quantum phases [Jackeli and Khaliullin, Phys. Rev. Lett. 102, 017205 (2009)].

Snapshots of the retarded electronic interaction with spin-fluctuations in high-temperature superconductors

Speaker: 
Claudio Giannetti (i-Lamp & Università Cattolica, Brescia, Italy)
Event Date and Time: 
Thu, 2014-01-23 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

One of the pivotal questions in the physics of high-temperature superconductors, that is whether there is any boson mediating the low-energy dynamics of the charge carriers [1, 2].

Emergent quantum phases in the iron pnictides and heavy fermion materials

Speaker: 
Andriy Nevidomskyy (Rice University)
Event Date and Time: 
Thu, 2014-01-09 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

When interactions between constituent particles become sufficiently strong, quantum systems often display appearance of non-trivial collective excitations and novel phases of matter. I will elaborate this concept of quantum emergence on two examples: the "strange metal" (non-Fermi liquid) phase in heavy fermion materials, and the emergent nematic phase in the iron pnictide family. Intriguingly, unconventional superconductivity emerges in both these classes of materials, despite their seemingly very different nature.

Ultrafast Dynamics of Excited Carries in Graphene

Speaker: 
Alberto Crepaldi (Elettra-Sincrotrone Trieste)
Event Date and Time: 
Thu, 2014-01-16 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Andrea Damascelli
Intended Audience: 
Graduate

The transport and optical properties of graphene are made unique by the linear dispersion of the Dirac particles at the K point of its Brillouin zone [1]. Exploiting graphene for opto-electronic and light-harvesting devices requires a detailed knowledge of the physics describing the electron-hole pair generation and recombination, after optical perturbation [1]. Electron-phonon scattering is expected to play a central role in the relaxation processes. Nonetheless, the microscopic  mechanisms are still under-debate [2].

Scanning tunneling spectroscopy studies of charge ordering and rotational symmetry breaking in the high-temperature superconductor Bi2Sr2CaCu2O8+x

Speaker: 
Eduardo H da Silva Neto, UBC
Event Date and Time: 
Thu, 2013-11-07 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Andrea Damascelli
Intended Audience: 
Graduate

Understanding the mechanism of superconductivity and its interplay with other possible ordered states in high transition temperature (Tc) cuprate superconductors remains one of the most significant challenges in all of condensed matter physics. In this talk I will discuss scanning tunneling microscopy (STM) measurements which establish the formation of charge ordering in the high-temperature superconductor Bi2Sr2CaCu2O8+x (Bi-2212).

Disorder, interactions, and zero-bias anomalies

Speaker: 
Rachel Wortis, Trent University
Event Date and Time: 
Thu, 2013-10-24 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Mona Berciu
Intended Audience: 
Graduate

Many of the most interesting electronic behaviors arise in materials with strong electron-electron correlations.  Many of these same materials are disordered either intrinsically or due to doping.  The study of how electrons behave in the presence of both disorder and interactions has a long history, yet the regime of strong disorder and strong interactions remains poorly understood.  The density of states is one measure of the electrons which is readily accessible to both theorists and experimentalists.

Observation of Majorana quantum critical behavior in a resonant level coupled to a dissipative environment.

Speaker: 
Gleb Finkelstein, Duke University
Event Date and Time: 
Thu, 2013-11-14 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

We investigate tunneling through a resonant level embedded in a dissipative environment, which suppresses tunneling rates at low temperatures.

Oxide Nanoelectronics On Demand

Speaker: 
Jeremy Levy, University of Pittsburgh
Event Date and Time: 
Thu, 2013-10-31 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

Electronic confinement at nanoscale dimensions remains a central means of science and technology.

Helical edge resistance introduced by charge puddles

Speaker: 
Leonid Glazman, Yale University
Event Date and Time: 
Fri, 2013-10-11 16:00 - 17:00
Location: 
TBA
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

Electron puddles created by doping of a 2D topological insulator may violate the ideal helical edge conductance. Because of a long electron dwelling time, even a single puddle may lead to a significant inelastic backscattering. We find the resulting correction to the perfect edge conductance. Generalizing to multiple puddles, we assess the dependence of the helical edge resistance on temperature and doping level.

Rescheduled!

Event Date and Time: 
Thu, 2013-10-17 14:00
Location: 
Hennings 318
Local Contact: 
Mona Berciu
Intended Audience: 
Graduate

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