Green's function method in the theory of Brownian motors
a Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine, Ghenerala Naumova str. 17, Kiev, 03164, Ukraine
b Belarussian State University, prosp. F. Scoriny 4, Minsk, 220050, Belarus
c Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina, 4, Moscow, 119991, Russian Federation
d Lomonosov Moscow State University, Vorobevy Gory, Moscow, 119991, Russian Federation
We present the main results of the theory of Brownian motors obtained using the author approach in which a Brownian particle moving in a slightly fluctuating potential profile is considered. By the Green's function method, the perturbation theory in small fluctuations of potential energy is constructed. This approach allows obtaining an analytical expression for the average particle velocity that is valid for two main types of Brownian motors (flashing and rocking ratchets) and any (stochastic or deterministic) time dependence of the fluctuations. The advantage of the proposed approach lies in the compactness of the description and, at the same time, in the variety of motor systems analyzed with its help: the overwhelming majority of known analytical results in the theory of Brownian motors follow from this expression. The mathematical derivations and analysis of those results forms the main content of these methodological notes.