Personne

Sylvain Bréchet

Publications associées (24)

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A heat-driven magnetization damping, that is a linear function of a temperature gradient, is predicted in antiferromagnets by considering the sublattice dynamics subjected to a heat-driven spin torque. This points to the possibility of achieving a spin tor ...

2018

Thermal spin torques in magnetic insulators

Yi Zhang, Jean-Philippe Ansermet, Sylvain Bréchet, Ping Che, Cheng Zhao, Haiming Yu, Sa Tu, Francesco Antonio Vetrò, Yao Zhang

The damping of spin waves transmitted through a two-port magnonic device implemented on a yttrium iron garnet thin film is shown to be proportional to the temperature gradient imposed on the device. The sign of the damping depends on the relative orientati ...

Amer Physical Soc2017

Quantum molecular master equations

Jean-Philippe Ansermet, Sylvain Bréchet, François Reuse, Klaus Maschke

We present the quantum master equations for midsize molecules in the presence of an external magnetic field. The Hamiltonian describing the dynamics of a molecule accounts for the molecular deformation and orientation properties, as well as for the electro ...

American Physical Society2016

Thermodynamique

Jean-Philippe Ansermet, Sylvain Bréchet

La thermodynamique est une théorie physique qui permet d'établir des relations entre des grandeurs physiques caractérisant le système physique qu'on se propose d'analyser. Ces grandeurs correspondent à des propriétés macroscopiques observées. L'usage de ce ...

Presses Polytechniques et Universitaires Romandes (PPUR)2016

Spin Caloritronics, origin and outlook

Jean-Philippe Ansermet, Sylvain Bréchet, Haiming Yu

Spin caloritronics refers to research efforts in spintronics when a heat current plays a role. In this review, we start out by reviewing the predictions that can be drawn from the thermodynamics of irreversible processes. This serves as a conceptual framew ...

Elsevier2016

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Since their discovery in 1927, the Heisenberg Inequalities have become an icon of quantum mechanics. Often inappropriately referred to as the Uncertainty Principle, these inequalities relating the standard deviations of the position and momentum observable ...

EDP Sciences2015

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A rigorous quantum description of molecular dynamics with a particular emphasis on internal observables is developed accounting explicitly for kinetic couplings between nuclei and electrons. Rotational modes are treated in a genuinely quantum framework by ...

Springer Verlag2015

The thermodynamics of irreversible processes in continuous media predicts the existence of a magnetic Nernst effect that results from a magnetic analog to the Seebeck effect in a ferromagnet and magnetophoresis occurring in a paramagnetic electrode in cont ...

World Scientific Publishing2015

Variational principle for magnetisation dynamics in a temperature gradient

Jean-Philippe Ansermet, Sylvain Bréchet

By applying a variational principle on a magnetic system within the framework of extended irreversible thermodynamics, we find that the presence of a temperature gradient in a ferromagnet leads to a generalisation of the Landau-Lifshitz equation with an ad ...

EDP Sciences2015

Magnetoelectric effect in a hydrogen molecule

Jean-Philippe Ansermet, Sylvain Bréchet, François Reuse, Klaus Maschke

The symmetry breaking due to a magnetic field applied on a hydrogen molecule H2 generates an electric polarization. This magnetoelectric effect occurs for electrons in a triplet state provided the magnetic induction field is not aligned with the symmetry a ...

World Scientific Publishing2014