Chirality effect on electron phonon relaxation, energy loss, and thermopower in single and bilayer graphene in BG regime

Ansari, M. and Ashraf, S.S.Z. (2017) Chirality effect on electron phonon relaxation, energy loss, and thermopower in single and bilayer graphene in BG regime. Journal of Applied Physics, 122 (16). ISSN 218979

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Abstract

We investigate the energy dependent electron-phonon relaxation rate, energy loss rate, and phonon drag thermopower in single layer graphene (SLG) and bilayer graphene (BLG) under the Bloch-Gruneisen (BG) regime through coupling to acoustic phonons interacting via the Deformation potential in the Boltzmann transport equation approach. We find that the consideration of the chiral nature of electrons alters the temperature dependencies in two-dimensional structures of SLG and BLG from that shown by other conventional 2DEG system. Our investigations indicate that the BG analytical results are valid for temperatures far below the BG limit (∼TBG/4) which is in conformity with a recent experimental investigation for SLG [C. B. McKitterick et al., Phys. Rev. B 93, 075410 (2016)]. For temperatures above this renewed limit (∼TBG/4), there is observed a suppression in energy loss rate and thermo power in SLG, but enhancement is observed in relaxation rate and thermopower in BLG, while a suppression in the energy loss rate is observed in BLG. This strong nonmonotonic temperature dependence in SLG has also been experimentally observed within the BG limit [Q. Ma et al., Phys. Rev. Lett. 112, 247401 (2014)].

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculties > Faculty of Science > Department of Physics
Depositing User: AMU Library
Date Deposited: 05 Feb 2018 04:54
Last Modified: 05 Feb 2018 04:54
URI: http://ir.amu.ac.in/id/eprint/11088

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