Comments on Controllable Three-Dimensional Brownian Motors

TL;DR

This paper critiques a recent demonstration of a 3D Brownian motor, arguing that its processes do not align with the traditional definitions of Brownian motion as established by Einstein and others.

Contribution

It provides a critical analysis challenging the validity of the claimed Brownian motor demonstration in symmetric potentials.

Findings

The processes described are incompatible with classical Brownian motion.

The paper questions the interpretation of the experimental results.

It emphasizes the importance of adhering to established definitions of Brownian motors.

Abstract

Upon reviewing the physical review letter which describes the processes involved in "demonstration of a controllable three-dimensional Brownian motor in symmetric potentials" we conclude that such processes are not compatible with what Einstein and many other physicists and engineers define as Brownian motors or Brownian movements.