Abstract
We present thermal measurements of large-area (over ) monolayer graphene samples at cryogenic temperatures to study the electron-phonon thermal conductivity of graphene. By using two large samples with areas which differ by a factor of 10, we are able to clearly show the area dependence of the electron-phonon cooling. We find that, at temperatures far below the Bloch-Grüneisen temperature , the electron-phonon cooling power is accurately described by the temperature dependence predicted for clean samples. Using this model, we are able to extract a value for the electron-phonon coupling constant as a function of gate voltage and the graphene electron-lattice deformation potential.
- Received 26 May 2015
- Revised 16 January 2016
DOI:https://doi.org/10.1103/PhysRevB.93.075410
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