Publications by Jean-Philippe Ansermet

Related publications (126)

Hyperactivity of the default mode network in schizophrenia and free energy: A dialogue between Freudian theory of psychosis and neuroscience

Pierre Magistretti, Jean-Philippe Ansermet

The economic conceptualization of Freudian metapsychology, based on an energetics model of the psyche's workings, offers remarkable commonalities with some recent discoveries in neuroscience, notably in the field of neuroenergetics. The pattern of cerebral ...

FRONTIERS MEDIA SA2022

Thermodynamics of a continuous medium with electric and magnetic dipoles

Jean-Philippe Ansermet, Sylvain Bréchet

The thermodynamics of an electrically charged, multicomponent fluid with spontaneous electric and magnetic dipoles is analysed in the presence of electromagnetic fields. Taking into account the chemical composition of the current densities and stress tenso ...

EDP Sciences, Springer2013

Nonlocal Detection of Interlayer Three-Magnon Coupling

Jean-Philippe Ansermet, Haiming Yu

A leading nonlinear effect in magnonics is the interaction that splits a high-frequency magnon into two low-frequency magnons with conserved linear momentum. Here, we report experimental observation of nonlocal three-magnon scattering between spatially sep ...

AMER PHYSICAL SOC2023

Enhancement of electrocatalysis through magnetic field effects on mass transport

Jean-Philippe Ansermet, Magalí Alejandra Lingenfelder, Yunchang Liang

Magnetic field effects on electrocatalysis have recently gained attention due to the substantial enhancement of the oxygen evolution reaction (OER) on ferromagnetic catalysts. When detecting an enhanced catalytic activity, the effect of magnetic fields on ...

Nature Portfolio2024

Thermodynamics of continuous media with intrinsic rotation and magnetoelectric coupling

Jean-Philippe Ansermet, Sylvain Bréchet

The thermodynamics of an electrically charged, multicomponent continuous medium with intrinsic rotation is analysed in the presence of electromagnetic fields with a weak linear magnetoelectric coupling in the non-relativistic limit. Taking into account the ...

Springer Verlag2013

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

Enhanced magnetic field sensitivity of spin-dependent transport in cluster-assembled metallic nanostructures

Jean-Philippe Ansermet, Jean-Pierre Abid, Santiago Serrano Guisan, Giulia Di Domenicantonio

The emerging field of spintronics explores the many possibilities offered by the prospect of using the spin of the electrons for fast, nanosized electronic devices. The effect of magnetization acting on a current is the essence of giant or tunnel magnetore ...

Nature Publishing Group2006

Thermodynamics of continuous media with electromagnetic fields

Jean-Philippe Ansermet, Sylvain Bréchet, François Reuse

The thermodynamics of an electrically charged, multicomponent continuous medium with electromagnetic fields is analysed in the non-relativistic limit. Applying locally the first and second law of thermodynamics and Maxwell’s equations for a linear theory o ...

EDP Sciences, Springer2012

Electrochemical Overhauser dynamic nuclear polarization

Jean-Philippe Ansermet, Christophe Roussel, Jonas Milani, Mika Antero Tamski

Nuclear Magnetic Resonance (NMR) spectroscopy suffers from low sensitivity due to the low nuclear spin polarization obtained within practically achievable external magnetic fields. Dynamic Nuclear Polarization (DNP) refers to techniques that increase the N ...

2020

Control of spin currents by magnon interference in a canted antiferromagnet

Jean-Philippe Ansermet, Dirk Grundler, Peng Chen, Keita Yamamoto, Junfeng Hu, Anna Duvakina

Controlling the spin current lies at the heart of spintronics and its applications. In ferromagnets, the sign of spin currents is fixed once the current direction is determined. However, spin currents in antiferromagnets can possess opposite polarizations, ...

Springer Science and Business Media LLC2025

Opto-spintronics in InP using ferromagnetic tunnel spin filters

Jean-Philippe Ansermet, Murari Soundararajan, Dongyoung Yoon, Christian Caspers

We demonstrate opto-spintronics using Fe-doped Indium Phosphide (InP). The method is based on optical orientation of InP conduction electron spins which are electrically detected in planar InP/oxide/Ni tunnel spin filters. We separate the optical excitatio ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2015

Deterministic switching of antiferromagnetic spin textures by nonlinear magnons

Jean-Philippe Ansermet, Dirk Grundler, Mohammad Hamdi, Mingran Xu, Hanning Zhang

Antiferromagnetic spin textures, compared to their ferromagnetic counterparts, innately possess high stability with respect to external disturbance and high-frequency dynamics compatible with ultrafast information processing. However, deterministic creatio ...

DIN Media GmbH2025

Thermoelectric Phenomena in Bi1-xSbx Nanowires in Semimetal and Gapless Region

Jean-Philippe Ansermet

The paper report results of magneto-thermoelectric properties the single crystal Bi1-xSbx nanowires in glass cover with different diameters prepared by Ulitovsky-Taylor method. We study the effect of nanowire dimensionality in the Bi1-xSbx, nanowires in se ...

Amer Scientific Publishers2012

Surface States Transport in Topological Insulator Bi0.83Sb0.17 Nanowires

Jean-Philippe Ansermet

We investigate the transport properties of topological insulator (TI) nanowires. Single-crystal nanowire samples with diameters ranging from 75 nm to 1.1 m are prepared using high frequency liquid phase casting in a glass capillary; cylindrical single crys ...

Springer Verlag2016

Long-Distance Coherent Propagation of High-Velocity Antiferromagnetic Spin Waves

Jean-Philippe Ansermet, Haiming Yu

We report on coherent propagation of antiferromagnetic (AFM) spin waves over a long distance (similar to 10 mu m) at room temperature in a canted AFM alpha-Fe2O3 owing to the Dzyaloshinskii-Moriya interaction (DMI). Unprecedented high group velocities (up ...

AMER PHYSICAL SOC2023

From the Principle of Inertia to the Death Drive: The Influence of the Second Law of Thermodynamics on the Freudian Theory of the Psychical Apparatus

Pierre Magistretti, Jean-Philippe Ansermet

In the Freudian theory of the psychical apparatus, the introduction from the 1920s onward of the second drive dualism appears as a major turning point. The idea of a "death drive," first expressed in Beyond the Pleasure Principle (Freud, 1920), is generall ...

Frontiers Media2020

Anomalous Hall and Nernst Effects in Co2TiSn and Co2Ti0.6V0.4Sn Heusler Thin Films

Jean-Philippe Ansermet, Haiming Yu, Sa Tu, Junfeng Hu

Magnetotransport (magnetoresistance and anomalous Hall effect) and thermoelectric (Seebeck and anomalous Nernst effect) effects are investigated on epitaxially grown Co2TiSn and Co2Ti0.6V0.4Sn Heusler thin films. An anomalous Nernst coefficient up to 1.8 m ...

American Physical Society (APS)2018

Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures

Jean-Philippe Ansermet, Dirk Grundler, Peng Gao, Haiming Yu, Mohammad Hamdi

Magnons can transfer information in metals and insulators without Joule heating, and therefore are promising for low-power computation. The on-chip magnonics however suffers from high losses due to limited magnon decay length. In metallic thin films, it is ...

Nature Research2021

Large magnetothermopower and anomalous Nernst effect in HfTe5

Helmuth Berger, Jean-Philippe Ansermet, Arnaud Magrez, Jan Hugo Dil, Haiming Yu, Edoardo Martino, Junfeng Hu, Sa Tu, Marco Caputo

Topological quantum materials have stimulated growing attention because they reveal novel aspects of condensed matter physics and point to new opportunities in materials science, in particular for thermoelectrics. Here, we experimentally study thermoelectr ...

AMER PHYSICAL SOC2019

Low-temperature hopping and absence of spin-dependent transport in single crystals of cobalt-doped ZnO

Jean-Philippe Ansermet, Simon Granville

Long needle-shaped single crystals of Zn1-xCoxO were grown at low temperatures using a molten salt solvent technique, up to x=0.10. The conduction process at low temperatures is determined to be Mott variable range hopping. Both pristine and cobalt-doped c ...

2010