# Sylvain Bréchet

#### Senior Scientist

**EPFL SB SPH-GE **

PH D1 324 (Bâtiment PH)

Station 3

1015 Lausanne

Web site: Web site: https://sph.epfl.ch/

+41 21 693 44 12

EPFL
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Web site: Web site: https://sph.epfl.ch/

### Current work

His research activities in the group of Prof. Jean-Philippe Ansermet focuses on theoretical modeling in condensed matter physics and more particularly in spintronics. Merging the fields of non-equilibrium thermodynamics, continuum mechanics and electromagnetism, he brought new insight to spintronics and spincaloritronics and also to nematics and fluid mechanics. In particular, he predicted the existence of a fundamental irreversible thermodynamic effect now known as the Magnetic Seebeck effect. This effect was verified experimentally in the group of Prof. Jean-Philippe Ansermet. Currently, he is developing a rigorous theoretical approach for the algebraic formulation of non-relativistic quantum molecular dynamics where the vibrational, rotational and magnetic degrees of freedom are treated in a purely quantum framework. The dynamics of the quantum molecular system is described by quantum statistical master equations.### Biography

Sylvain Bréchet was born on October 13th, 1981 in Moudon (legal origin Epesses, VD, Switzerland). He obtained a Master of Science in physics at EPFL in 2005. He went on to Cambridge for his PhD studies in theoretical cosmology from 2005 to 2009 under the supervision of Prof. Lasenby (FRS) and Prof. Michael Hobson at the Cavendish Laboratory of the University of Cambridge. He went back to EPFL where he is since 2010 university lecturer and research scientist in the Institute of Condensed Matter Physics. He taught classical mechanics, special relativity and thermodynamics to mechanical, electrical engineering students and physics students. He is currently writing a textbook in thermodynamics.## Publications

### Infoscience publications

#### Articles

#### Onsager-Casimir reciprocal relations as a consequence of the equivalence between irreversibility and dissipation

*Journal Of Non-Equilibrium Thermodynamics*. 2023-12-15. DOI : 10.1515/jnet-2023-0069.

#### Magnetic Contribution to the Seebeck Effect

*Entropy*. 2018-11-30. DOI : 10.3390/e20120912.

#### Heat-driven spin torques in antiferromagnets

*Journal of Physics D: Applied Physics*. 2018. DOI : 10.1088/1361-6463/aab2f7.

#### Quantum molecular master equations

*Physical Review -Series a-*. 2016. DOI : 10.1103/PhysRevA.94.042505.

#### Variational principle for magnetisation dynamics in a temperature gradient

*Europhysics Letters*. 2015. DOI : 10.1209/0295-5075/112/17006.

#### Magnetic Nernst effect

*Modern Physics Letters B*. 2015. DOI : 10.1142/S0217984915502462.

#### Quantum description of a rotating and vibrating molecule

*European Physical Journal d Atomic Molecular and Optical Physics*. 2015. DOI : 10.1140/epjd/e2015-60019-6.

#### Rotational Heisenberg Inequalities

*European Physical Journal d Atomic Molecular and Optical Physics*. 2015.

#### Magnetoelectric effect in a hydrogen molecule

*Modern Physics Letters B*. 2014. DOI : 10.1142/S0217984914500705.

#### Kinetic initial conditions for inflation

*Physical Review -Series d-*. 2014. DOI : 10.1103/PhysRevD.89.063505.

#### Evidence for a Magnetic Seebeck Effect

*Physical Review Letters*. 2013. DOI : 10.1103/PhysRevLett.111.087205.

#### Magnetoelectric Ponderomotive Force

*Modern Physics Letters B*. 2013. DOI : 10.1142/S0217984913501509.

#### Thermodynamics of a continuous medium with electric and magnetic dipoles

*European Physical Journal B Condensed Matter Physics*. 2013. DOI : 10.1140/epjb/e2013-40069-4.

#### Thermodynamics of continuous media with intrinsic rotation and magnetoelectric coupling

*Continuum Mechanics and Thermodynamics*. 2013. DOI : 10.1007/s00161-013-0294-9.

#### Thermodynamics of continuous media with electromagnetic fields

*European Physical Journal B Condensed Matter Physics*. 2012. DOI : 10.1140/epjb/e2012-30719-4.

#### Heat-driven spin currents on large scales

*Physica Status Solidi (Rrl) Rapid Research Letters*. 2011. DOI : 10.1002/pssr.201105180.

#### Lagrange Equations Coupled to a Thermal Equation: Mechanics as Consequence of Thermodynamics

*Entropy*. 2011. DOI : 10.3390/e13020367.

#### First-order adiabatic perturbations of a perfect fluid about a general FLRW background using the 1+3 covariant and gauge-invariant formalism

*Physical Review D*. 2009.

#### Classical big-bounce cosmology: dynamical analysis of a homogeneous and irrotational Weyssenhoff fluid

*Classical and Quantum Gravity*. 2008. DOI : 10.1088/0264-9381/25/24/245016.

#### Weyssenhoff fluid dynamics in general relativity using a 1 + 3 covariant approach

*Classical and Quantum Gravity*. 2007. DOI : 10.1088/0264-9381/24/24/011.

#### Vacuum decay on a brane world

*Physical Review -Series d-*. 2005. DOI : 10.1103/PhysRevD.71.104023.

#### Books

#### Thermodynamique

Lausanne: Presses Polytechniques et Universitaires Romandes (PPUR).#### Et la lumière fut

Romanel-sur-Lausanne: Ourania.#### PhD Thesis

#### Cosmological Perturbation Theory

University of Cambridge, 2009.### Teaching & PhD

#### Teaching

Physics