Fractional extension of Kramers rate and barrier escaping from metastable potential well

TL;DR

This paper extends Kramers' rate formula to fractional dynamics, analyzing barrier escape from metastable wells, revealing increased transmission coefficients and complex dependence on fractional parameters, with implications for non-Ohmic damping systems.

Contribution

The study introduces a fractional extension of Kramers' rate formula, providing new insights into barrier escape dynamics and recrossing behavior in non-Ohmic damping environments.

Findings

Stationary transmission coefficient is larger than in classical cases.

Transmission coefficient shows non-monotonic dependence on fractional exponent.

Near barrier dynamics resemble diffusion in non-Ohmic damping systems.

Abstract

The reactive process of barrier escaping from the metastable potential well is studied together with the extension of Kramers' rate formula to the fractional case. Characteristic quantities are computed for an thimbleful of insight into the near barrier escaping and recrossing dynamics. Where the stationary transmission coefficient is revealed to be larger than the usual cases which implies less barrier recrossing. And the non-monotonic varying of it reveals a close dependence to the fractional exponent $\alpha$. In most cases, the near barrier behavior of the escaping dynamics is equivalent to the diffusion in the two-dimensional non-Ohmic damping system.