Transport of Forced Quantum Motors in the Strong Friction Limit

TL;DR

This paper investigates how quantum and classical Brownian motors transport in asymmetric potentials under various noise and load conditions, revealing insights into their current-load behavior in different regimes.

Contribution

It introduces a comprehensive analysis of quantum tunneling effects on ratchet transport under strong friction and nonequilibrium noise, extending classical models.

Findings

Quantum tunneling enhances transport efficiency.

Current-load characteristics depend on noise amplitude and temperature.

Distinct behaviors observed in classical and quantum regimes.

Abstract

The directed transport of an overdamped Brownian motor moving in a spatially periodic potential that lacks reflection symmetry (i.e. a ratchet potential) is studied when driven by thermal and dichotomic nonequilibrium noise in the presence of an external, constant load force. We consider both, the classical and the quantum tunneling assisted regimes. The current-load characteristics are investigated as a function of the system parameters like the load force, the temperature and the amplitude strength of the applied two-state noise.