Electron-phonon heat transfer in monolayer and bilayer graphene
By J. Viljas, T. Heikkilä. 2010
195 citations recorded by the source corpus.
We calculate the heat transfer between electrons to acoustic and optical phonons in monolayer and bilayer graphene (MLG and BLG) within the quasiequilibrium approximation. For acoustic phonons, we show how the temperature-power laws of the electron-phonon heat current for BLG differ from those previously derived for MLG and note that the high-temperature (neutral-regime) power laws for MLG and BLG are also different, with a weaker dependence on the electronic temperature in the latter. In the general case we evaluate the heat current numerically. We suggest that a measurement of the heat current could be used for an experimental determination of the electron-acoustic-phonon coupling constants, which are not accurately known. However, in a typical experiment heat dissipation by electrons at very low temperatures is dominated by diffusion and we estimate the crossover temperature at which acoustic-phonon coupling takes over in a sample with Joule heating. At even higher temperatures optical phonons begin to dominate. We study some examples of potentially relevant types of optical modes, including, in particular, the intrinsic in-plane modes and additionally the remote surface phonons of a possible dielectric substrate.
Subfields: Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/82dc2576482065a36d782eecfdec2d798f9d2cd6
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In Materials Chemistry
Citations in the corpus
- Photocurrent measurements of supercollision cooling in graphene (2012, methodology): “To compare the above power laws extracted against the SCmodel we combine equation (1) with the thermoelectric model to predict a CW PC power dependence of:”
- Sensitive room-temperature terahertz detection via the photothermoelectric effect in graphene. (2013, methodology): “mpared to existing THz detectors with sub -100 ps response times. We now estimate the magnitude of the thermoelectric responsivity theoretically. First we ignore the electron-acoustic phonon coupling [14,24] and the details of the device and make a simple estimate based on diffusive cooling alone by”