Origin of the Temperature Collapse of the Electric Conductivity in Bilayer Graphene
arXiv:2003.00533 · doi:10.1103/PhysRevResearch.2.023391
Abstract
Recent experiments have reported evidence of dominant electron-hole scattering in the electric conductivity of suspended bilayer graphene near charge neutrality. According to these experiments, plots of the electric conductivity as a function of (chemical potential scaled with temperature) obtained for different temperatures in the range of collapse on a single curve independent of . In a recent theory, this observation has been taken as an indication that the main sub-dominant scattering process is not electron-impurity but electron-phonon. Here we demonstrate that the collapse of the data on a single curve can be explained without invoking electron-phonon scattering, but assuming that the suspended bilayer graphene is not a truly gapless system. With a gap of meV, our theory produces excellent agreement with the observed conductivity over the full reported range of temperatures. These results are based on the hydrodynamic theory of conductivity, which thus emerges as a solid foundation for the analysis of experiments and the estimation of the band-gap in multiband systems.
arXiv comment5 pages, 2 figures
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