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2 mars 2017

Local injection of pure spin current generates electric current vortices

In a paper, published by Applied Physics Letters, Yaroslaw Bazaliy of the University of South Carolina and Revaz Ramazashvili of the LPT have studied local injection of pure spin current into an electrically disconnected ferromagnetic-normal sandwich. Curiously enough, it turns out that local spin injection inevitably induces electric current vortices, that are centered at the normal-ferromagnetic interface. This finding invites us to revisit various aspects of spin injection in spintronic devices.

Appl. Phys. Lett. 110, 092405 (2017)

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11 octobre 2016

Temperature dependence of the NMR relaxation rate 1/T1 for quantum spin chains

Maxime Dupont, PhD student in LPT, together with Sylvain Capponi and Nicolas Laflorencie, studied dynamical correlations at finite temperature in quantum spin chains using matrix product state techniques, thus allowing to extract the NMR relaxation rate. This work addresses the delicate question of the low-temperature dimensional crossover in realistic materials, such as coupled S=1 chains material DTN.

Phys. Rev. B 94, 144409 (2016) (Editors’ Suggestion)

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2 septembre 2016

Dynamics of a Mobile Impurity in a One-Dimensional Bose Liquid

We developed a microscopic theory of a quantum impurity propagating in a one-dimensional Bose liquid. As a result of scattering off thermally excited quasiparticles, the impurity experiences the friction. We found that, at low temperatures, the resulting force scales either as the fourth or the eighth power of temperature, depending on the system parameters. For temperatures higher than the chemical potential of the Bose liquid, the friction force is a linear function of temperature.

Aleksandra Petković and Zoran Ristivojevic Phys. Rev. Lett. 117, 105301 (2016)

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30 août 2016

International CECAM workshop "Mesoscopic Modeling in Physics of Molecular and Cell Biology"

This workshop intends to gather theoretical physicists specialized in statistical physics and soft matter, and working on different subjects related to molecular and cell biology, but using very similar paradigms and tools. They belong to coarse-grained models, effective mesoscopic models, and/or analytical approaches.

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7 mars 2016

Collective behavior in the big data era : can we enhance collective intelligence in human groups ?

This workshop promotes an interdisciplinary approach to studying collective behavior in human groups, fostering cross-disciplinary interactions between various communities : quantitative ethology, social sciences, economics, information technologies and statistical physics.

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17 novembre 2015

International workshop Theory Days 2015

Following the tradition of the previous successful six meetings in Toulouse, the Theory Days workshop aims at stimulating constructive discussions, collaborations, and knowledge exchange among a selected group of theoreticians.

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