Coupling between electrons and optical phonons in suspended bilayer graphene

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© 2015 American Physical Society (APS). This is the accepted version of the following article: Laitinen, Antti & Kumar, Manohar & Oksanen, Mika & Placais, Bernard & Virtanen, Pauli & Hakonen, Pertti J. 2015. Coupling between electrons and optical phonons in suspended bilayer graphene. Physical Review B. Volume 91, Issue 12. 121414/1-5. DOI: 10.1103/physrevb.91.121414, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.121414.
Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2015
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Mcode
Degree programme
Language
en
Pages
121414/1-5
Series
Physical Review B, Volume 91, Issue 12
Abstract
Using electrical transport experiments and shot noise thermometry, we investigate electron-phonon heat transfer rate in a suspended bilayer graphene. Contrary to monolayer graphene with heat flow via three-body supercollision scattering, we find that regular electron–optical-phonon scattering in bilayer graphene provides the dominant scattering process at electron energies ≳0.15 eV. We determine the strength of these intrinsic heat flow processes of bilayer graphene and find good agreement with theoretical estimates when both zone edge and zone center optical phonons are taken into account.
Description
Keywords
bilayer graphene, electron-phonon coupling, shot noise thermometry, conductance measurements
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Citation
Laitinen, Antti & Kumar, Manohar & Oksanen, Mika & Placais, Bernard & Virtanen, Pauli & Hakonen, Pertti J. 2015. Coupling between electrons and optical phonons in suspended bilayer graphene. Physical Review B. Volume 91, Issue 12. 121414/1-5. DOI: 10.1103/physrevb.91.121414