Abstract
The acoustic-phonon-limited thermoelectric properties (TEPs), namely, mobility (μ), electronic thermal conductivity (κe) and diffusion thermopower (Sd) in bilayer graphene (BLG) are investigated over a temperature range 2<T<100K. We consider two physically distinct temperature ranges with respect to phonon scattering – the Bloch-Gruneisen (BG), and equipartition (EP) regimes taking into account the temperature dependent effects arising from screening of electron-phonon interaction within random phase approximation. The numerical calculations of Sd shows a signature of BG regime. The mobility and electronic thermal conductivity are found to increase rapidly with decrease in temperature, while Sd follows a non-linear behavior at low temperatures. At higher temperatures TEPs are found to merge with values calculated using EP approximation. The importance of screening function in BLG is discussed. The study helps a better understanding of electron-phonon interaction in bilayer graphene.
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