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Experimental evidence of disorder enhanced electron-phonon scattering in graphene devices

Research output: Contribution to journalJournal articlepeer-review

E-pub ahead of print
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<mark>Journal publication date</mark>30/06/2021
<mark>Journal</mark>Carbon
Volume178
Number of pages8
Pages (from-to)632-639
Publication StatusE-pub ahead of print
Early online date9/12/20
<mark>Original language</mark>English

Abstract

Induced disorder in graphene enables changes in the electrical and thermal transport. It has been shown previously that disorder is very important for electron cooling in graphene through disorder-assisted electron-phonon scattering, particularly via the supercollisions process. Here we study electron momentum relaxation due to electron-phonon scattering while increasing the degree of disorder. With in-situ Scanning Thermal Microscopy we monitor the temperature rise in the constriction of a bow tie-shaped graphene device while increasing the disorder by means of feedback-controlled voltage ramps at high-currents. Analysis of the combined thermal and electrical measurements shows that, the relative change of the momentum scattering rate vs temperature, as measured at room temperature, increases with strong local disorder. By excluding candidate mechanisms for this phenomenon, including a change of the charge density and activation of optical phonons, we conclude that the observed increase in the temperature dependent part of the scattering rate is likely due to new acoustic phonon scattering channels that open up as disorder increases.