Observation of vacancy-induced suppression of electronic cooling in defected graphene

TL;DR

This study demonstrates that vacancy-induced dynamic disorder in graphene significantly suppresses electronic cooling, contrasting with static disorder effects, and suggests potential improvements for graphene-based detectors.

Contribution

It reveals the impact of dynamic vacancy disorder on electron-phonon interactions in graphene, showing suppression of electronic cooling not previously observed.

Findings

Vacancy defects cause over an order of magnitude suppression of electronic cooling.

The suppression effect is stronger with increased vacancy concentration.

The coupling constant depends on phonon temperature, linking disorder dynamics to cooling behavior.

Abstract

Previous studies of electron-phonon interaction in impure graphene have found that static disorder can give rise to an enhancement of electronic cooling. We investigate the effect of dynamic disorder and observe over an order of magnitude suppression of electronic cooling compared with clean graphene. The effect is stronger in graphene with more vacancies, confirming its vacancy-induced nature. The dependence of the coupling constant on the phonon temperature implies its link to the dynamics of disorder. Our study highlights the effect of disorder on electron-phonon interaction in graphene. In addition, the suppression of electronic cooling holds great promise for improving the performance of graphene-based bolometer and photo-detector devices.