Quantum features of Brownian motors and stochastic resonance.

Statistical Physics of Biocomplexity

Biology and physics share common ancestors. The progress of methods of statistical physics and the developments of new physical tools and various ingenious experimental techniques have triggered dramatic progress for the field of biophysics. Likewise, the two fields fertilized each other repeatedly over the last decades. Most import antly, the complexity of biophysics inspired new developments ...

Stochastic resonance: from climate to biology

In this lecture, I will review some basic aspects of the mechanism of stochastic resonance, first introduced as a possible mechanism to explain long term climatic variation. Since then, there have been many applications of stochastic resonance in physical and biological systems. I will show that in complex system, stochastic resonance can substantially change as a function of the “system comple...

Existence and Measurability of the Solution of the Stochastic Differential Equations Driven by Fractional Brownian Motion

Nonadiabatic Quantum Brownian Rectifiers

We study both dissipative and nondissipative quantum transport in discrete Brownian rectifiers being driven by nonthermal noise that is unbiased on average. In the absence of dissipation the current is always zero and the ballistic diffusion changes into normal diffusion. The dissipative quantum dynamics exhibits current (with distinctive reversals) as a result of the cooperative interplay betw...

Stochastic dynamics of magnetization in a ferromagnetic nanoparticle out of equilibrium

We consider a small metallic particle quantum dot where ferromagnetism arises as a consequence of Stoner instability. When the particle is connected to electrodes, exchange of electrons between the particle and the electrodes leads to a temperatureand bias-driven Brownian motion of the direction of the particle magnetic moment. Under certain conditions this Brownian motion is described by the s...