Condensed Matter Seminar

semester, 2019


Wednesday, January 23rd 2019
1:30 pm:
There will be no seminar this week.

Wednesday, February 6th 2019
1:25 pm:
Speaker: Rafael Fernandes, University of Minnesota
Subject: Vestigial orders in electronic correlated systems: nematicity and beyond

A hallmark of the phase diagrams of correlated electronic systems is the existence of multiple electronic ordered states. In many cases, they cannot be simply described as independent competing phases, but instead display a complex intertwinement. A prime example of intertwined states is the case of primary and vestigial phases. While the former is characterized by a multi-component order parameter, the fluctuation-driven vestigial state is characterized by a composite order parameter formed by higher-order, symmetry-breaking combinations of the primary order parameter. This concept has been widely employed to elucidate nematicity in both iron-based and cuprate superconductors. In this talk, I will present a group-theoretical framework, supplemented by microscopic calculations, that extends this notion to a variety of phases, providing a general classification of vestigial orders of unconventional superconductors and density-waves. Electronic states with scalar and vector chiral order, spin-nematic order, Ising-nematic order, time-reversal symmetry-breaking order, and algebraic vestigial order emerge from this simple underlying principle. I will present a rich variety of possible phase diagrams involving the primary and vestigial orders, and discuss possible realizations of these exotic composite orders in different materials.


Wednesday, February 13th 2019
1:25 pm:
Speaker: Andrey Chubukov, University of Minnesota, TPI
Subject: TBD

Wednesday, February 20th 2019
1:25 pm:
Speaker: Boris Spivak, University of Washington
Subject: Magneto-transport phenomena related to the chiral anomaly in Weyl and Dirac semimetals

I will present a theory of magnetotransport phenomena related to the chiral anomaly in Weyl semimetals. I will show that conductivity, thermal conductivity, thermoelectric and the sound absorption coefficients exhibit strong and anisotropic magnetic field dependences. I will also discuss properties of magneto-plasmons and magneto-polaritons, whose existence is entirely determined by the chiral anomaly.

Faculty Host: Boris Shklovskii

Wednesday, February 27th 2019
1:25 pm:
Speaker: Joerg Schmalian, Karlsruhe Institute of Technology
Subject: TBD
Faculty Host: Rafael Fernandes

Wednesday, March 6th 2019
1:25 pm:
March APS Meeting - No speaker this week

Wednesday, March 13th 2019
1:25 pm:
Speaker: Oleg Starykh, University of Utah
Subject: TBD
Faculty Host: Andrey Chubukov

Wednesday, March 20th 2019
1:25 pm:
Spring Break - No speaker this week.

Wednesday, March 27th 2019
1:25 pm:
Speaker: Itamar Kimchi, University of Colorado - Boulder
Subject: TBD
Faculty Co-Host: Alex Kamenev
Faculty Host: Fiona Burnell

Wednesday, April 3rd 2019
Speaker: Graeme Luke, McMaster University
Subject: To be announced

Wednesday, April 10th 2019
1:25 pm:
Speaker: Vidya Madhavan, University of Illinois - Urbana-Champaign
Subject: TBD
Faculty Host: Martin Greven

Wednesday, April 17th 2019
1:25 pm:
Speaker: Jorn Venderbos, University of Pennsylvania
Subject: TBD
Faculty Host: Rafael Fernandes

Wednesday, April 24th 2019
1:25 pm:
Speaker: Ming Yi, Rice University
Subject: TBD
Faculty Host: Rafael Fernandes

Wednesday, May 1st 2019
1:25 pm:
Speaker: Jack Harris, Yale University
Subject: TBD
Faculty Host: Paul Crowell

Wednesday, September 25th 2019
1:25 pm:
Speaker: Scott Crooker, Los Alamos National Lab
Subject: TBD
Faculty Host: Paul Crowell

Wednesday, November 13th 2019
1:25 pm:
Speaker: Ana Maria Rey, University of Colorado - Boulder
Subject: TBD

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