28 research outputs found
Stochastic Thermodynamics of oscillators networks
We apply the stochastic thermodynamics formalism to describe the dynamics of
systems of complex Langevin and Fokker-Planck equations. We provide in
particular a simple and general recipe to calculate thermodynamical currents,
dissipated and propagating heat for networks of nonlinear oscillators. By using
the Hodge decomposition of thermodynamical forces and fluxes, we derive a
formula for entropy production that generalises the notion of non-potential
forces and makes trans- parent the breaking of detailed balance and of time
reversal symmetry for states arbitrarily far from equilibrium. Our formalism is
then applied to describe the off-equilibrium thermodynamics of a few examples,
notably a continuum ferromagnet, a network of classical spin-oscillators and
the Frenkel-Kontorova model of nano friction.Comment: 8 pages, 1 figur
Multiscale approach to spin transport in magnetic multilayers
This article discusses two dual approaches to spin transport in magnetic
multilayers: a direct, purely quantum, approach based on a Tight-Biding model
(TB) and a semiclassical approach (Continuous Random Matrix Theory, CRMT). The
combination of both approaches provides a systematic way to perform
multi-scales simulations of systems that contain relevant physics at scales
larger (spin accumulation, spin diffusion...) and smaller (specular reflexions,
tunneling...) than the elastic mean free paths of the layers. We show
explicitly that CRMT and TB give consistent results in their common domain of
applicability