Condensed Matter Seminars

Correlated electrons from the bottom up: application to high-Tc cuprates

Speaker: 
Lucas Wagner, UIUC
Event Date and Time: 
Tue, 2016-02-09 13:00 - 14:00
Location: 
Hennings 318
Local Contact: 
George Sawatzky/Mona Berciu
Intended Audience: 
Graduate

First principles calculations, in which materials are simulated using only fundamental constants, are a powerful way to study electronic structure of materials.

Hacking the Superconducting Nanowire: Detecting Single Photons, Resurrecting the Cryotron, and Pushing Current Around Corners

Speaker: 
Karl Berggren, MIT
Event Date and Time: 
Thu, 2016-03-31 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Sarah Burke
Intended Audience: 
Graduate
Superconducting nanowires have long been of interest for their unusual electrothermal behavior, and the exhibition of quantum phase slips--twists in the electron wavefunction that can occur spontaneously in the right environment.  However, they have also demonstrated themselves recently to be of key importance to the field of photodetection, with important applications in communications and metrology.

Cavity Optomechanics in a Millikelvin Environment

Speaker: 
John Davis, University of Alberta
Event Date and Time: 
Thu, 2016-02-11 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Sarah Burke
Intended Audience: 
Graduate

In the past decade a revolution has taken place in our ability to measure mechanical motion, originating in large part from experiments at gravitational observatories.  Such observatories use massive optical cavities to explore the tiny changes in displacement that could be caused by passing gravitational waves.

The Nature of Fermi-liquids, an Optical Perspective

Speaker: 
Damien Stricker, Universite de Geneve
Event Date and Time: 
Thu, 2016-02-04 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

A reference point for research on a wider range of correlated behaviour is provided by the so-called Fermi liquids, characterized by a relaxation rate (ħω)2 + (pπkBT)2.

CANCELLED (to be rescheduled)

Speaker: 
Jon Paul Maria, NCSU
Event Date and Time: 
Thu, 2016-01-28 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
George Sawatzky
Intended Audience: 
Graduate

Testing the reality of the quantum wavefunction

Speaker: 
Stephanie Simmons, Simon Fraser University
Event Date and Time: 
Thu, 2016-01-21 14:00 - 15:00
Location: 
Hennings 318
Intended Audience: 
Graduate

Is a quantum wavefunction exclusively an abstract mathematical tool — perhaps something which encodes our knowledge of a quantum system? Or is the quantum wavefunction instead a concrete physical entity which exists in reality? Until fairly recently it seemed like the answers to such epistemic/ontic questions could not be provided experimentally.

Nanoscale investigations of high-Tc superconductivity in monolayer FeSe/SrTiO3

Speaker: 
Dennis Huang, Harvard University
Event Date and Time: 
Thu, 2016-01-07 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Jenny Hoffman
Intended Audience: 
Graduate

The potential of interface engineering to generate novel electronic properties is exemplified in a monolayer of FeSe grown on SrTiO3, which exhibits an order-of-magnitude increase in its superconducting transition temperature (Tc up to 110 K) compared to bulk (Tc = 9 K). Since this discovery in 2012, efforts to reproduce, understand, and extend this finding continue to draw both excitement and scrutiny.

Non-Fermi-liquid scattering rates and anomalous band dispersions in ironpnictides and ironchalcogenides - an ARPES study

Speaker: 
Jörg Fink, Leibniz Institute for Solid State and Materials Research Dresden, Germany
Event Date and Time: 
Mon, 2015-11-16 14:00 - 15:00
Location: 
AMPEL 311
Local Contact: 
Andrea Damascelli
Intended Audience: 
Graduate

Unconventional/high temperature superconductivity (SC) is observed in heavy fermion systems, cuprates, molecular crystals, and ferropnictides close to a point in the phase diagram where, as a function of a control parameter such as pressure, chemical pressure, or doping, the antiferromagnetic order is suppressed.

The photo-Nernst effect in graphene

Speaker: 
David Cobden, Department of Physics, University of Washington, Seattle
Event Date and Time: 
Thu, 2015-10-29 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Josh Folk
Intended Audience: 
Graduate
Scanning photocurrent measurements provide a powerful means of studying the spatially resolved optoelectronic and electrical properties of a device. In graphene devices in a perpendicular magnetic field we observe photocurrent generated uniformly along the free edges, with opposite sign at opposite edges. The signal is antisymmetric in field, shows a peak versus gate voltage at the neutrality point flanked by wings of opposite sign at low fields, and exhibits quantum oscillations at higher fields.

Edge currents in chiral superfluids and superconductors

Speaker: 
Wen Huang (McMaster and KITP)
Event Date and Time: 
Tue, 2015-10-13 13:00 - 14:00
Location: 
Hennings 309
Local Contact: 
Marcel Franz
Intended Audience: 
Graduate

Cooper pairs in two-dimensional chiral superfluids and superconductors carry non-zero and quantized orbital angular

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