Condensed Matter Seminars

Cross-interface electron-phonon interactions in FeSe Films on oxide substrates

Speaker: 
Steve Johnston, University of Tennessee
Event Date and Time: 
Thu, 2016-06-02 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Mona Berciu
Intended Audience: 
Graduate

A flurry of scientific activities has been generated by the discovery of a significantly enhanced superconductivity in ultra thin films of FeSe grown on oxide substrates such as SrTiO3 .

Design Principles of Shift Current Photovoltaics

Speaker: 
Ashley Cook (U Toronto)
Event Date and Time: 
Thu, 2016-05-26 14:00 - 15:00
Location: 
Henn 304
Local Contact: 
Marcel Franz

While the basic principles and limitations of conventional solar cells are well understood, relatively little attention has gone toward evaluating and maximizing the potential efficiency of photovoltaic devices based on shift currents. In this talk, we give a brief introduction to the shift current. We discuss its promise as a mechanism for high-performance, low-cost photovoltaics and how it may be of interest to many in the condensed matter physics community.

Discovery of an electronic Goldstone mode in the (putative) excitonic insulator, 1T-TiSe2

Speaker: 
Peter Abbamonte, University of Illinois
Event Date and Time: 
Fri, 2016-05-27 14:00 - 15:00
Location: 
AMPEL 311
Local Contact: 
George Sawatzky
Intended Audience: 
Graduate

1T-TiSe2 is a layered, transition metal dichalcogenide that exhibits a competition between superconducting and charge density wave (CDW) ground states, mimicking many aspects of the phase diagram of high temperature superconductors. Because of its nearly inverted band structure, the CDW phase has often been interpreted as an "excitonic insulator" ground state formed via spontaneous proliferation of excitons with finite momentum.

Fluctuating charge order in the optimally-doped high temperature superconductor, Bi2Sr2CaCu2O8+x

Speaker: 
Peter Abbamonte, University of Illinois
Event Date and Time: 
Thu, 2016-05-26 11:00 - 12:00
Location: 
AMPEL 311
Local Contact: 
George Sawatzky

The field of high temperature superconductivity has been revolutionized by the recent discovery of charge order in most families of underdoped copper‐oxides. There are still fundamental mysteries, however, about how this order is related to superconductivity, i.e., whether it is present at optimal doping, whether it is static or fluctuating, etc.

Aspects of Ising-nematic quantum critical point

Speaker: 
Ipsita Mandal
Event Date and Time: 
Wed, 2016-05-25 14:00 - 15:00
Location: 
henn 304
Local Contact: 
Marcel Franz
Intended Audience: 
Graduate
We devise a renormalization group analysis for quantum field theories with Fermi surface to study scaling behaviour of non-Fermi liquid states in a controlled approximation. The non-Fermi liquid fixed points are identified from a Fermi surface in (m+1) spatial dimensions, while the co-dimension of Fermi surface is also extended to a generic value. We also study superconducting instability in such systems as a function of dimension and co-dimension of the Fermi surface.

TBA

Speaker: 
Peter Abbamonte, University of Illinois
Event Date and Time: 
Thu, 2016-05-26 11:00 - 12:00
Location: 
AMPEL 311
Local Contact: 
George Sawatzky
Intended Audience: 
Graduate

SEMINAR CANCELLED

Speaker: 
Alexander Weber-Bargioni, Molecular Foundry LBNL
Event Date and Time: 
Tue, 2016-05-17 14:30 - 15:30
Location: 
AMPEL 311
Local Contact: 
Sarah Burke
Intended Audience: 
Graduate

Electronic and Optoelectronic processes in matter are governed by the electronic structure and are well understood for most bulk material systems. Even individual nano building blocks made from these materials are reasonably well characterized. However, the effect of defects and specifically hierarchically ordered defects in quantum confined material systems on the electronic properties or the effect of order in heterogeneous nano building block assemblies on the resulting optoelectronic properties are largely uncharted territory.

Quantum criticality in heavy fermion metals

Speaker: 
Emilian Marius Nica, Department of Physics and Astronomy & Rice Center for Quantum Materials, Rice University
Event Date and Time: 
Thu, 2016-05-12 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Marcel Franz
Intended Audience: 
Graduate

Heavy fermion systems provide a prototype-setting for the study of strongly-correlated electrons. Experiments on heavy-fermion metals such as CeCu6-xAux, YbRh2Si2, and CeRhIn5 have generated a great deal of interest in the general context of magnetic quantum phase transitions and associated non-Fermi liquid behaviors.

Transform & Diagonalize (T&D) approaches to electronic structure with applications to molecular spectroscopy

Speaker: 
Marcel Nooijen, Department of Chemistry, University of Waterloo
Event Date and Time: 
Fri, 2016-05-13 14:00 - 15:30
Location: 
Hennings 318
Local Contact: 
John Sous
Intended Audience: 
Graduate

One of the remaining open challenges for quantum chemistry concerns the routine calculation of molecular systems that require a multireference description, and the simulation of their spectroscopic properties. Notoriously are molecules containing one or more transition metal atoms. I will describe a recent coupled cluster approach that enables the calculation of a large number of electronic states

Tunable Electronic and Magnetic Properties of Rare-Earth Nickelate Heterostructures

Speaker: 
Matthias Hepting, MPI-FKF Stuttgart
Event Date and Time: 
Tue, 2016-04-05 13:30 - 14:30
Location: 
AMPEL 311
Local Contact: 
George Sawatzky
Intended Audience: 
Graduate

The rich phase diagram of transition metal oxides (TMO) such as rare-earth nickelates RNiO3

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