Find the upcoming seminars below.
TQM seminar #25 : November 23 2023, 2pm (IMPMC conference room, towers 23-22, 4th floor, room 402)
Indranil Paul (MPQ, Université Paris Cité & CNRS)
Electronic Nematicity in Correlated Metals and Superconductors
Nematic materials are those that break rotational symmetry spontaneously and develop directional properties below a certain temperature. They are common among soft matter such as liquid crystals, but are rare in the quantum realm. For long, scientists have speculated if electrons in a solid can become nematic due to their mutual Coulomb repulsion. And if yes, then what are the properties of such phase transitions and how to experimentally detect them. The question of detection is tricky because the atomic arrangement in the solid itself can break the symmetry and induce directional properties. The Fe-based systems, which are celebrated for their high temperature superconductivity, are also ideal playgrounds to study the above questions related to electronic nematicity. In this talk I will provide an overview of the topic. First, I will discuss how nematic electronic phase transitions have unique characteristics that are due to electron-phonon interaction. Second, I will present a microscopic theory of the interplay between nematic and superconducting instabilities. Third, I will discuss how electronic interaction driven nematic transition can be distinguished experimentally from lattice instability driven transition. I will finish by highlighting some of the open questions in the field.
- Charge Nematicity and Electronic Raman Scattering in Iron-based Superconductors, Y. Gallais and I. Paul, Comptes Rendus Physique 17, 113 (2016).
- Lattice effects on nematic quantum criticality in metals, I. Paul and M. Garst, Phys. Rev. Lett. 118, 227601 (2017).
- Variation of shear moduli across superconducting phase transitions, D. Labat, P. Kotetes, B. M. Andersen, and I. Paul, Phys. Rev. B 101, 144502 (2020).
TQM seminar #26 : December 6 2023, 2pm (LPTMC seminar room, towers 13-12, 5th floor, room 523)
Filippo Vicentini (Ecole Polytechnique)
TBA: on quantum information/tomography
TQM seminar #27 : January 18 2023, 2pm (????)
Irénée Frérot (LKB)
TQM seminar #28 : February 29 2023, 2pm (LPTHE library????)
Blagoje Oblak (ICJ Lyon)
TQM seminar #29 : March 14 2023, 2pm (LPTMC seminar room, towers 13-12, 5th floor, room 523)
Andrej Mesaros (LPS Orsay)