Taillefer Group

Quantum materials research group at the Université de Sherbrooke

News Join the team

News

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Weyl semimetal: 2 publications in PRB

September 2020

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).

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New publication in Nature Physics

July 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).

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Reopening of the lab!

May 2020

Simon Fortier is preparing to reopen our two laboratories: cooling cryogenic systems, repair and maintenance of pumps as well as implementing security measures. This is the first step towards restarting research!

Research

Studying the electrons in quantum materials

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.


Quantum materials

Unconventional superconductors, spin liquids, topological insulators, Weyl semimetals.

Superconductivity

Property of a material that allows it to transport an electric current with zero resistance and to expel a magnetic field.

Transport measurements

Electric resistivity, thermal conductivity, Hall effect, Seebeck effect, Nernst effect, Righi-Leduc effect.

Low temperatures

Two dilution fridges allow us to reach temperatures as low as a few dozen millikelvins.

Magnetic Field

Superconducting coils give us access to magnetic fields up to 20 T.

High Pressure

Our pressure cells can apply up to 2 GPa, the pressure of roughly 20 000 atmospheres.

The Laboratories

From the cryostats to the dilution fridges via the prep-rooms.

Photo : UdeS - Martin Blache

Contact us

Address

Département de Physique
Université de Sherbrooke
2500 boul. Université, Sherbrooke (Québec)
Canada J1K 2R1