Louis was invited to give a public virtual lecture on superconductivity.
Simons Foundation Lectures are free public colloquia related to basic science and mathematics. These high-level talks are intended for professors, students, postdocs and business professionals, but interested people from the metropolitan area are welcome as well.
The collaboration between the Taillefer group and the team of Professor James Analytis (UC Berkeley) as well as Professor Jeffrey Quilliam (University of Sherbrooke) led to the publication of two papers on TaAs, a Weyl semi-metal, in PRB.
Field-angle dependence of sound velocity in the Weyl semimetal TaAs
F. Laliberté et al., Phys. Rev. B 102, 125104 (2020).
Signatures of possible surface states in TaAs
N.L. Nair et al., Phys. Rev. B 102, 075402 (2020).
Professor Taillefer's group continues to investigate the giant negative thermal Hall effect discovered last year in the pseudogap phase of superconducting cuprates (Nature 571, 376-380 (2019)). The team now reveals that this effect comes from the atomic vibrations of the material, the phonons. But how can it be that particles without an electric charge still manage to couple to the external magnetic field to generate a thermal Hall effect? Those responsible for the phenomenon have now been unmasked, but the origin of this mystery remains unsolved.
Chiral phonons in the pseudogap phase of cuprates
G. Grissonnanche et al., Nature Physics (2020).
Strong interactions between electrons is an inexhaustible source of intriguing collective properties. The quantum materials we study include unconventional superconductors, spin liquids, topological insulators and Weyl semimetals, among others. Our experimental approach consists of measuring the electric, thermal and thermoelectric transport properties of these materials under different conditions of temperature, magnetic field and pressure. These measurements allow us to explore the behaviour of electrons and to describe the underlying interactions.
Unconventional superconductors, spin liquids, topological insulators, Weyl semimetals.
Property of a material that allows it to transport an electric current with zero resistance and to expel a magnetic field.
Electric resistivity, thermal conductivity, Hall effect, Seebeck effect, Nernst effect, Righi-Leduc effect.
Two dilution fridges allow us to reach temperatures as low as a few dozen millikelvins.
Superconducting coils give us access to magnetic fields up to 20 T.
Our pressure cells can apply up to 2 GPa, the pressure of roughly 20 000 atmospheres.
Photo : UdeS - Martin Blache
Département de Physique
Université de Sherbrooke
2500 boul. Université, Sherbrooke (Québec)
Canada J1K 2R1