Electron-phonon instability in graphene revealed by global and local noise probes

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Science  12 Apr 2019:
Vol. 364, Issue 6436, pp. 154-157
DOI: 10.1126/science.aaw2104

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Graphene: Driven to emission

Studying the electronic properties of graphene under extreme nonequilibrium conditions has provided a productive testbed to probe and monitor exotic transport phenomena. Andersen et al. report measurements of electron transport in ultraclean graphene devices where the electron drift velocity is extremely high. They found that direct current at high drift velocities generates a large increase in the noise at gigahertz frequencies and that the noise grows exponentially in the direction of the current. The authors attribute the emission mechanism to amplification of acoustic phonons through the Cerenkov effect.

Science, this issue p. 154