Condensed Matter Seminars

Macroscopic character of composite high temperature superconducting wires and enhancement of superconductivity by magnetic field

Speaker: 
Boris Spivak, University of Washington
Event Date and Time: 
Thu, 2016-11-10 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Philip Stamp

d-wave symmetry of the superconducting order in the cuprate high temperature superconductors is a well established fact, and one which identifies them as unconventional. However, in macroscopic contexts including many potential applications (i.e. superconducting wires) the material is a composite of randomly oriented superconducting grains in a metallic matrix, in which Josephson coupling between grains mediates the onset of long-range phase coherence.

Driven Dirac Materials

Speaker: 
Alexander Balatsky (Nordita and Los Alamos National Laboratory)
Event Date and Time: 
Fri, 2016-11-04 12:00 - 13:00
Location: 
Hennings 318
Local Contact: 
Marcel Franz
Intended Audience: 
Graduate

Recent pump-probe experiments demonstrate the possibility that Dirac materials (DMs) may be driven into transient excited states describable by the state with two separate inverted occupancies, one for

Magnetism meets topology: Quantum anomalous Hall effect and Chiral spin liquids

Speaker: 
Arun Paramekanti, University of Toronto
Event Date and Time: 
Thu, 2016-10-20 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Ian Affleck

First, I will discuss recent developments in the field of oxide heterostructures, and present our proposal to realize half-metallic Chern bands and a high Tc quantized anomalous Hall effect in mixed 3d/5d oxides. A key component of this proposal involves an orbital analogue of the Rashba effect which may have broader implications in orbitally degenerate oxides.

Cooper like pairing induced by electron ionic polarizability

Speaker: 
Yizhak Yacoby, Hebrew University of Jerusalem
Event Date and Time: 
Thu, 2016-09-22 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
George Sawatzky

Using the fact that the electron ionic polarizability response time is practically instantaneous we show that a charge carrier induces large attractive potential to a second carrier in small pockets in the two particle position space. Taking into account the inter-carrier repulsion and the kinetic energy needed in order to confine the carriers to the attractive potential pockets we find that the pairing energy is of the order of the energies seen in high Tc superconductors.

Design and manipulation of functional molecular nanosystems

Speaker: 
Johannes Barth, Department of Physics, Technical University of Munich
Event Date and Time: 
Wed, 2016-08-10 14:00 - 15:00
Location: 
AMPEL 311
Local Contact: 
Sarah Burke
Intended Audience: 
Graduate

Towards realizing topological superconductivity in quantum wires

Speaker: 
Vincent Mourik, University of New South Wales
Event Date and Time: 
Thu, 2016-06-23 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Dmitry Pikulin
Intended Audience: 
Graduate

The engineering of topological superconductors and the observation and control of their non-abelian quasiparticles is a dominant effort in condensed matter physics, both out of fundamental interest and for their potential application in topological quantum computing.

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.

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